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FullStack-Todo-Tutorial.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>FullStack-Todo-Tutorial</title>
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<div class="container-fluid">
<div class="row">
<div id="sidebar" class="col-sm-3 col-md-2 sidebar">
<!--<ul class="nav nav-sidebar">
<li class="active"><a href="#">Overview <span class="sr-only">(current)</span></a></li>
</ul>-->
<ul>
<li><a href="#todo-full-stack-with-angular-and-spring-boot"
id="toc-todo-full-stack-with-angular-and-spring-boot">Todo
Full Stack with Angular and Spring Boot</a>
<ul>
<li><a href="#table-of-contents"
id="toc-table-of-contents">Table of contents</a></li>
<li><a href="#frontend" id="toc-frontend">Frontend</a>
<ul>
<li><a href="#introduction"
id="toc-introduction">Introduction</a></li>
<li><a href="#todo-list-design" id="toc-todo-list-design">Todo
List Design</a></li>
<li><a href="#header-footer-error-component"
id="toc-header-footer-error-component">Header-Footer-Error
Component</a></li>
<li><a href="#frontend-authentication"
id="toc-frontend-authentication">Frontend
Authentication</a></li>
<li><a href="#routeguard-service"
id="toc-routeguard-service">RouteGuard Service</a></li>
</ul></li>
<li><a href="#backend" id="toc-backend">Backend</a>
<ul>
<li><a href="#connnecting-backend-to-frontend"
id="toc-connnecting-backend-to-frontend">Connnecting Backend
to Frontend</a></li>
<li><a href="#crud-operation" id="toc-crud-operation">CRUD
Operation</a></li>
<li><a href="#read" id="toc-read">READ</a></li>
<li><a href="#delete" id="toc-delete">DELETE</a></li>
<li><a href="#update" id="toc-update">UPDATE</a></li>
<li><a href="#create" id="toc-create">CREATE</a></li>
</ul></li>
<li><a href="#authentication-with-jwt"
id="toc-authentication-with-jwt">Authentication with JWT</a>
<ul>
<li><a href="#hardcoded-authentication"
id="toc-hardcoded-authentication">HardCoded
Authentication</a></li>
<li><a href="#authentication-using-backend-creds"
id="toc-authentication-using-backend-creds">Authentication
using Backend Creds</a></li>
<li><a href="#spring-security-with-jwt"
id="toc-spring-security-with-jwt">Spring Security with
JWT</a></li>
<li><a href="#endpoints" id="toc-endpoints">Endpoints</a></li>
</ul></li>
<li><a href="#using-database" id="toc-using-database">Using
Database</a></li>
<li><a href="#deploying-fullstack-in-heroku"
id="toc-deploying-fullstack-in-heroku">Deploying FullStack in
Heroku</a>
<ul>
<li><a href="#deploying-backend"
id="toc-deploying-backend">Deploying Backend</a></li>
<li><a href="#deploying-frontend-with-environment"
id="toc-deploying-frontend-with-environment">Deploying
Frontend with Environment</a></li>
</ul></li>
<li><a href="#logging-by-slf4j"
id="toc-logging-by-slf4j">Logging by SLF4j</a></li>
<li><a href="#caching-by-hazlecast"
id="toc-caching-by-hazlecast">Caching by Hazlecast</a></li>
</ul></li>
</ul>
</div>
<div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
<p></p>
<h1 id="todo-full-stack-with-angular-and-spring-boot">Todo Full Stack
with Angular and Spring Boot</h1>
<p><a href="https://todo-fullstack-swarna.herokuapp.com/">Live Link</a>
: https://todo-fullstack-swarna.herokuapp.com/</p>
<p>Repository Link :
https://github.com/in28minutes/full-stack-with-angular-and-spring-boot</p>
<h2 id="table-of-contents">Table of contents</h2>
<ul>
<li><a href="#frontend">Frontend</a>
<ul>
<li><a href="#introduction">Introduction</a></li>
<li><a href="#todo-list-design">Todo List Design</a>
<ul>
<li><a href="#list-todos-component">List-Todos Component</a></li>
</ul></li>
<li><a href="#header-footer-error-component">Header-Footer-Error
Component</a></li>
<li><a href="#frontend-authentication">Frontend Authentication</a></li>
<li><a href="#routeguard-service">RouteGuard Service</a></li>
</ul></li>
<li><a href="#backend">Backend</a>
<ul>
<li><a href="#basic-backend-setup">Basic Backend Setup</a></li>
<li><a href="#connnecting-backend-to-frontend">Connnecting Backend to
Frontend</a></li>
<li><a href="#crud-operation">CRUD Operation</a></li>
<li><a href="#read">READ</a></li>
<li><a href="#delete">DELETE</a></li>
<li><a href="#update">UPDATE</a></li>
<li><a href="#create">CREATE</a></li>
</ul></li>
<li><a href="#authentication-with-jwt">Authentication with JWT</a>
<ul>
<li><a href="#hardcoded-authentication">HardCoded Authentication</a>
<ul>
<li><a href="#backend-hardcoded-auth">Backend Hardcoded Auth</a></li>
<li><a href="#frontend-hardcoded-auth">Frontend Hardcoded Auth</a></li>
</ul></li>
<li><a href="#authentication-using-backend-creds">Authentication using
Backend Creds</a>
<ul>
<li><a href="#steps">Steps</a></li>
</ul></li>
<li><a href="#spring-security-with-jwt">Spring Security with JWT</a>
<ul>
<li><a href="#frontend-jwt-changes">Frontend JWT Changes</a></li>
<li><a href="#backend-jwt-changes">Backend JWT Changes</a></li>
</ul></li>
<li><a href="#endpoints">Endpoints</a></li>
</ul></li>
<li><a href="#using-database">Using Database</a></li>
<li><a href="#deploying-fullstack-in-heroku">Deploying FullStack in
Heroku</a>
<ul>
<li><a href="#deploying-backend">Deploying Backend</a></li>
<li><a href="#deploying-frontend-with-environment">Deploying Frontend
with Environment</a></li>
</ul></li>
<li><a href="#logging-by-slf4j">Logging by SLF4j</a>
<ul>
<li><a href="#rolling-log">Rolling Log</a></li>
</ul></li>
<li><a href="#caching-by-hazlecast">Caching by Hazlecast</a></li>
</ul>
<h2 id="frontend">Frontend</h2>
<h3 id="introduction">Introduction</h3>
<p>Final App we’ll build</p>
<p><img src="images/finalapp.png" alt="finalapp" style="zoom: 67%;" /></p>
<p>Learning Steps</p>
<p><img src="images/LearningSteps.png" alt="LearningSteps" style="zoom: 67%;" /></p>
<p>AngularLearningTopics</p>
<p><img src="images/AngularLearningTopics.png" alt="AngularLearningTopics" style="zoom:50%;" /></p>
<ul>
<li>Generated frontend project - <code>ng new todo</code></li>
</ul>
<h5 id="appcomponent">AppComponent</h5>
<p><strong><em>app.component.html</em></strong></p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><router-outlet></router-outlet></span></span></code></pre></div>
<p> <strong><em>app-routing.module.ts</em></strong></p>
<div class="sourceCode" id="cb2"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="kw">const</span> routes<span class="op">:</span> Routes <span class="op">=</span> [</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">''</span><span class="op">,</span> component<span class="op">:</span> LoginComponent }<span class="op">,</span></span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'login'</span><span class="op">,</span> component<span class="op">:</span> LoginComponent }<span class="op">,</span></span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'welcome/:name'</span><span class="op">,</span> component<span class="op">:</span> WelcomeComponent }<span class="op">,</span> <span class="co">//Activated Route Parameters</span></span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'**'</span><span class="op">,</span> component<span class="op">:</span> ErrorComponent }<span class="op">,</span></span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a>]<span class="op">;</span></span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="op">...</span></span></code></pre></div>
<p><strong><em>app.module.ts</em></strong></p>
<div class="sourceCode" id="cb3"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a>@<span class="fu">NgModule</span>({</span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a> declarations<span class="op">:</span> [</span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a> AppComponent<span class="op">,</span></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a> WelcomeComponent<span class="op">,</span></span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a> LoginComponent<span class="op">,</span></span>
<span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a> ErrorComponent</span>
<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a> ]<span class="op">,</span></span>
<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a> imports<span class="op">:</span> [</span>
<span id="cb3-9"><a href="#cb3-9" aria-hidden="true" tabindex="-1"></a> BrowserModule<span class="op">,</span></span>
<span id="cb3-10"><a href="#cb3-10" aria-hidden="true" tabindex="-1"></a> AppRoutingModule<span class="op">,</span></span>
<span id="cb3-11"><a href="#cb3-11" aria-hidden="true" tabindex="-1"></a> FormsModule</span>
<span id="cb3-12"><a href="#cb3-12" aria-hidden="true" tabindex="-1"></a> ]<span class="op">,</span></span>
<span id="cb3-13"><a href="#cb3-13" aria-hidden="true" tabindex="-1"></a><span class="op">...</span></span></code></pre></div>
<h5 id="logincomponent">LoginComponent</h5>
<p><strong><em>login.component.html</em></strong></p>
<div class="sourceCode" id="cb4"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a>Username : <span class="kw"><input</span> <span class="er">type</span><span class="ot">=</span><span class="st">"text"</span> <span class="er">name</span><span class="ot">=</span><span class="st">"username"</span> <span class="er">[(ngModel)]</span> <span class="ot">=</span> <span class="st">"username"</span><span class="kw">></span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a>Password : <span class="kw"><input</span> <span class="er">type</span><span class="ot">=</span><span class="st">"password"</span> <span class="er">name</span><span class="ot">=</span><span class="st">"password"</span> <span class="er">[(ngModel)]</span> <span class="ot">=</span> <span class="st">"password"</span><span class="kw">></span></span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="kw"><button</span> <span class="er">(click)</span><span class="ot">=</span><span class="st">"handleLogin()"</span><span class="kw">></span>Login<span class="kw"></button></span> <span class="kw"><br></span></span>
<span id="cb4-4"><a href="#cb4-4" aria-hidden="true" tabindex="-1"></a><span class="kw"><small</span> <span class="er">*ngIf</span><span class="ot">=</span><span class="st">"invalidLogin"</span><span class="kw">></span>Login Unsuccessful<span class="kw"></small></span></span></code></pre></div>
<p><strong><em>login.component.ts</em></strong></p>
<div class="sourceCode" id="cb5"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> LoginComponent <span class="kw">implements</span> OnInit {</span>
<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a> username <span class="op">=</span> <span class="st">''</span><span class="op">;</span></span>
<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a> password <span class="op">=</span> <span class="st">''</span><span class="op">;</span></span>
<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a> invalidLogin <span class="op">=</span> <span class="kw">false</span><span class="op">;</span></span>
<span id="cb5-5"><a href="#cb5-5" aria-hidden="true" tabindex="-1"></a> </span>
<span id="cb5-6"><a href="#cb5-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> router<span class="op">:</span> Router) {}</span>
<span id="cb5-7"><a href="#cb5-7" aria-hidden="true" tabindex="-1"></a> <span class="fu">ngOnInit</span>()<span class="op">:</span> <span class="dt">void</span> {}</span>
<span id="cb5-8"><a href="#cb5-8" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb5-9"><a href="#cb5-9" aria-hidden="true" tabindex="-1"></a> <span class="fu">handleLogin</span>() {</span>
<span id="cb5-10"><a href="#cb5-10" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> (<span class="kw">this</span><span class="op">.</span><span class="at">username</span> <span class="op">===</span> <span class="st">'user'</span> <span class="op">&&</span> <span class="kw">this</span><span class="op">.</span><span class="at">password</span> <span class="op">===</span> <span class="st">'pass'</span>) {</span>
<span id="cb5-11"><a href="#cb5-11" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">router</span><span class="op">.</span><span class="fu">navigate</span>([<span class="st">'welcome'</span><span class="op">,</span> <span class="kw">this</span><span class="op">.</span><span class="at">username</span>])</span>
<span id="cb5-12"><a href="#cb5-12" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">invalidLogin</span> <span class="op">=</span> <span class="kw">false</span><span class="op">;</span></span>
<span id="cb5-13"><a href="#cb5-13" aria-hidden="true" tabindex="-1"></a> <span class="co">// console.log("Login successful of User : " + this.username)</span></span>
<span id="cb5-14"><a href="#cb5-14" aria-hidden="true" tabindex="-1"></a> } <span class="cf">else</span> {</span>
<span id="cb5-15"><a href="#cb5-15" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">invalidLogin</span> <span class="op">=</span> <span class="kw">true</span></span>
<span id="cb5-16"><a href="#cb5-16" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb5-17"><a href="#cb5-17" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb5-18"><a href="#cb5-18" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<h5 id="welcomecomponent">WelcomeComponent</h5>
<p><strong><em>welcome.component.html</em></strong></p>
<div class="sourceCode" id="cb6"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><p></span>welcome {{name}} !! to our awesome app<span class="kw"></p></span></span></code></pre></div>
<p><strong><em>welcome.component.ts</em></strong></p>
<div class="sourceCode" id="cb7"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> WelcomeComponent <span class="kw">implements</span> OnInit {</span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a> name <span class="op">=</span> <span class="st">''</span></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> aroute<span class="op">:</span> ActivatedRoute) { }</span>
<span id="cb7-4"><a href="#cb7-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">ngOnInit</span>()<span class="op">:</span> <span class="dt">void</span> {</span>
<span id="cb7-5"><a href="#cb7-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">name</span> <span class="op">=</span><span class="kw">this</span><span class="op">.</span><span class="at">aroute</span><span class="op">.</span><span class="at">snapshot</span><span class="op">.</span><span class="at">params</span>[<span class="st">'name'</span>]</span>
<span id="cb7-6"><a href="#cb7-6" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb7-7"><a href="#cb7-7" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<h3 id="todo-list-design">Todo List Design</h3>
<h4 id="list-todos-component">List-Todos Component</h4>
<p><strong><em>app-routing.module.ts</em></strong></p>
<div class="sourceCode" id="cb8"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a>{ path<span class="op">:</span> <span class="st">'todos'</span><span class="op">,</span> component<span class="op">:</span> ListTodosComponent }<span class="op">,</span></span></code></pre></div>
<p><strong><em>list-todos.component.html</em></strong></p>
<div class="sourceCode" id="cb9"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb9-1"><a href="#cb9-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><table</span> <span class="er">border</span><span class="ot">=</span><span class="st">"1"</span><span class="kw">></span></span>
<span id="cb9-2"><a href="#cb9-2" aria-hidden="true" tabindex="-1"></a> <span class="kw"><caption></span>My Todos<span class="kw"></caption></span></span>
<span id="cb9-3"><a href="#cb9-3" aria-hidden="true" tabindex="-1"></a> <span class="kw"><thead></span></span>
<span id="cb9-4"><a href="#cb9-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tr></span></span>
<span id="cb9-5"><a href="#cb9-5" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Description<span class="kw"></th></span></span>
<span id="cb9-6"><a href="#cb9-6" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Date<span class="kw"></th></span></span>
<span id="cb9-7"><a href="#cb9-7" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Is Completed ?<span class="kw"></th></span></span>
<span id="cb9-8"><a href="#cb9-8" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tr></span></span>
<span id="cb9-9"><a href="#cb9-9" aria-hidden="true" tabindex="-1"></a> <span class="kw"></thead></span></span>
<span id="cb9-10"><a href="#cb9-10" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tbody></span></span>
<span id="cb9-11"><a href="#cb9-11" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tr</span> <span class="er">*ngFor</span><span class="ot">=</span><span class="st">"let todo of todos"</span><span class="kw">></span></span>
<span id="cb9-12"><a href="#cb9-12" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.description }}<span class="kw"></td></span></span>
<span id="cb9-13"><a href="#cb9-13" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.targetDate | date }}<span class="kw"></td></span></span>
<span id="cb9-14"><a href="#cb9-14" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.done }}<span class="kw"></td></span></span>
<span id="cb9-15"><a href="#cb9-15" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tr></span></span>
<span id="cb9-16"><a href="#cb9-16" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tbody></span></span>
<span id="cb9-17"><a href="#cb9-17" aria-hidden="true" tabindex="-1"></a><span class="kw"></table></span></span></code></pre></div>
<p><strong><em>list-todos.component.ts</em></strong></p>
<div class="sourceCode" id="cb10"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> Todo {</span>
<span id="cb10-2"><a href="#cb10-2" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(</span>
<span id="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> id<span class="op">:</span> <span class="dt">number</span><span class="op">,</span></span>
<span id="cb10-4"><a href="#cb10-4" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> description<span class="op">:</span> <span class="dt">string</span><span class="op">,</span></span>
<span id="cb10-5"><a href="#cb10-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> done<span class="op">:</span> <span class="dt">boolean</span><span class="op">,</span></span>
<span id="cb10-6"><a href="#cb10-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> targetDate<span class="op">:</span> <span class="bu">Date</span></span>
<span id="cb10-7"><a href="#cb10-7" aria-hidden="true" tabindex="-1"></a> ) {}</span>
<span id="cb10-8"><a href="#cb10-8" aria-hidden="true" tabindex="-1"></a>}</span>
<span id="cb10-9"><a href="#cb10-9" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb10-10"><a href="#cb10-10" aria-hidden="true" tabindex="-1"></a>@<span class="fu">Component</span>({</span>
<span id="cb10-11"><a href="#cb10-11" aria-hidden="true" tabindex="-1"></a> <span class="op">...</span> </span>
<span id="cb10-12"><a href="#cb10-12" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> ListTodosComponent <span class="kw">implements</span> OnInit {</span>
<span id="cb10-13"><a href="#cb10-13" aria-hidden="true" tabindex="-1"></a> todos <span class="op">=</span> [</span>
<span id="cb10-14"><a href="#cb10-14" aria-hidden="true" tabindex="-1"></a> <span class="kw">new</span> <span class="fu">Todo</span>(<span class="dv">1</span><span class="op">,</span> <span class="st">'My first Todo'</span><span class="op">,</span> <span class="kw">true</span><span class="op">,</span> <span class="kw">new</span> <span class="bu">Date</span>())<span class="op">,</span></span>
<span id="cb10-15"><a href="#cb10-15" aria-hidden="true" tabindex="-1"></a> <span class="kw">new</span> <span class="fu">Todo</span>(<span class="dv">1</span><span class="op">,</span> <span class="st">'Welcome to India'</span><span class="op">,</span> <span class="kw">false</span><span class="op">,</span> <span class="kw">new</span> <span class="bu">Date</span>())<span class="op">,</span></span>
<span id="cb10-16"><a href="#cb10-16" aria-hidden="true" tabindex="-1"></a> <span class="kw">new</span> <span class="fu">Todo</span>(<span class="dv">1</span><span class="op">,</span> <span class="st">'Angular project'</span><span class="op">,</span> <span class="kw">true</span><span class="op">,</span> <span class="kw">new</span> <span class="bu">Date</span>())<span class="op">,</span></span>
<span id="cb10-17"><a href="#cb10-17" aria-hidden="true" tabindex="-1"></a> ]<span class="op">;</span></span>
<span id="cb10-18"><a href="#cb10-18" aria-hidden="true" tabindex="-1"></a><span class="op">...</span></span>
<span id="cb10-19"><a href="#cb10-19" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>welcome.component.html</em></strong> - adding routing
from welcome page to TodoList page</p>
<div class="sourceCode" id="cb11"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><p></span>welcome {{name}} !! to our awesome app<span class="kw"></p></span></span>
<span id="cb11-2"><a href="#cb11-2" aria-hidden="true" tabindex="-1"></a><span class="kw"><h3></span>You can manage your todos <span class="kw"><a</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/todos"</span><span class="kw">></span>here<span class="kw"></a></span>.<span class="kw"></h3></span></span></code></pre></div>
<p>Snapshot after TodoList component. (Before Bootstrap styling)</p>
<p><img src="images\before-bootstrap.png" alt="before-bootstrap" style="zoom:67%;" /></p>
<h5 id="added-bootstrap">Added Bootstrap</h5>
<pre class="shell"><code>$ npm install bootstrap
$ npm install jquery
// "bootstrap": "^4.6.1",
// "jquery": "^3.6.0",</code></pre>
<p><strong><em>angular.json</em></strong></p>
<div class="sourceCode" id="cb13"><pre
class="sourceCode json"><code class="sourceCode json"><span id="cb13-1"><a href="#cb13-1" aria-hidden="true" tabindex="-1"></a><span class="er">"architect":</span> <span class="fu">{</span></span>
<span id="cb13-2"><a href="#cb13-2" aria-hidden="true" tabindex="-1"></a> <span class="dt">"build"</span><span class="fu">:</span> <span class="fu">{</span> <span class="er">...</span></span>
<span id="cb13-3"><a href="#cb13-3" aria-hidden="true" tabindex="-1"></a> <span class="dt">"styles"</span><span class="fu">:</span> <span class="ot">[</span></span>
<span id="cb13-4"><a href="#cb13-4" aria-hidden="true" tabindex="-1"></a> <span class="st">"src/styles.css"</span><span class="ot">,</span></span>
<span id="cb13-5"><a href="#cb13-5" aria-hidden="true" tabindex="-1"></a> <span class="st">"./node_modules/bootstrap/dist/css/bootstrap.min.css"</span></span>
<span id="cb13-6"><a href="#cb13-6" aria-hidden="true" tabindex="-1"></a> <span class="ot">]</span><span class="fu">,</span></span>
<span id="cb13-7"><a href="#cb13-7" aria-hidden="true" tabindex="-1"></a> <span class="dt">"scripts"</span><span class="fu">:</span> <span class="ot">[</span></span>
<span id="cb13-8"><a href="#cb13-8" aria-hidden="true" tabindex="-1"></a> <span class="st">"./node_modules/jquery/dist/jquery.js"</span><span class="ot">,</span></span>
<span id="cb13-9"><a href="#cb13-9" aria-hidden="true" tabindex="-1"></a> <span class="st">"./node_modules/bootstrap/dist/js/bootstrap.js"</span></span>
<span id="cb13-10"><a href="#cb13-10" aria-hidden="true" tabindex="-1"></a> <span class="ot">]</span> <span class="er">...</span></span></code></pre></div>
<h3 id="header-footer-error-component">Header-Footer-Error
Component</h3>
<p>Created 3 components for Header, Footer and Error.</p>
<p><strong><em>nav.component.html</em></strong> - Header</p>
<div class="sourceCode" id="cb14"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb14-1"><a href="#cb14-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><nav</span> <span class="er">class</span><span class="ot">=</span><span class="st">"navbar navbar-expand-lg navbar-dark mb-2"</span> <span class="er">style</span><span class="ot">=</span><span class="st">"background-color: #016f77;"</span><span class="kw">></span></span>
<span id="cb14-2"><a href="#cb14-2" aria-hidden="true" tabindex="-1"></a> <span class="kw"><a</span> <span class="er">class</span><span class="ot">=</span><span class="st">"navbar-brand"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/"</span><span class="kw">></span>Todo Fullstack<span class="kw"></a></span></span>
<span id="cb14-3"><a href="#cb14-3" aria-hidden="true" tabindex="-1"></a> <span class="kw"><button</span> <span class="er">class</span><span class="ot">=</span><span class="st">"navbar-toggler"</span> <span class="er">type</span><span class="ot">=</span><span class="st">"button"</span> <span class="er">data-toggle</span><span class="ot">=</span><span class="st">"collapse"</span> <span class="er">data-target</span><span class="ot">=</span><span class="st">"#navbarSupportedContent"</span> <span class="er">aria-controls</span><span class="ot">=</span><span class="st">"navbarSupportedContent"</span> <span class="er">aria-expanded</span><span class="ot">=</span><span class="st">"false"</span> <span class="er">aria-label</span><span class="ot">=</span><span class="st">"Toggle navigation"</span><span class="kw">></span></span>
<span id="cb14-4"><a href="#cb14-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"><span</span> <span class="er">class</span><span class="ot">=</span><span class="st">"navbar-toggler-icon"</span><span class="kw">></span></span></span>
<span id="cb14-5"><a href="#cb14-5" aria-hidden="true" tabindex="-1"></a> <span class="kw"></button></span></span>
<span id="cb14-6"><a href="#cb14-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb14-7"><a href="#cb14-7" aria-hidden="true" tabindex="-1"></a> <span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"collapse navbar-collapse"</span> <span class="er">id</span><span class="ot">=</span><span class="st">"navbarSupportedContent"</span><span class="kw">></span></span>
<span id="cb14-8"><a href="#cb14-8" aria-hidden="true" tabindex="-1"></a> <span class="kw"><ul</span> <span class="er">class</span><span class="ot">=</span><span class="st">"navbar-nav mr-auto"</span><span class="kw">></span></span>
<span id="cb14-9"><a href="#cb14-9" aria-hidden="true" tabindex="-1"></a> <span class="co"><!--<li *ngIf="!loggedIn()" class="nav-item"></span></span>
<span id="cb14-10"><a href="#cb14-10" aria-hidden="true" tabindex="-1"></a><span class="co"> <a class="nav-link" routerLink="/login" routerLinkActive="active" [routerLinkActiveOptions]="{exact: true}">Login <span class="sr-only">(current)</span></a></span></span>
<span id="cb14-11"><a href="#cb14-11" aria-hidden="true" tabindex="-1"></a><span class="co"> </li>--></span></span>
<span id="cb14-12"><a href="#cb14-12" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-item"</span><span class="kw">></span></span>
<span id="cb14-13"><a href="#cb14-13" aria-hidden="true" tabindex="-1"></a> <span class="kw"><a</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/welcome/user"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Home<span class="kw"></a></span></span>
<span id="cb14-14"><a href="#cb14-14" aria-hidden="true" tabindex="-1"></a> <span class="kw"></li></span></span>
<span id="cb14-15"><a href="#cb14-15" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-item"</span><span class="kw">></span></span>
<span id="cb14-16"><a href="#cb14-16" aria-hidden="true" tabindex="-1"></a> <span class="kw"><a</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/todos"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Todos<span class="kw"></a></span></span>
<span id="cb14-17"><a href="#cb14-17" aria-hidden="true" tabindex="-1"></a> <span class="kw"></li></span></span>
<span id="cb14-18"><a href="#cb14-18" aria-hidden="true" tabindex="-1"></a> <span class="kw"></ul></span></span>
<span id="cb14-19"><a href="#cb14-19" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb14-20"><a href="#cb14-20" aria-hidden="true" tabindex="-1"></a> <span class="kw"><ul</span> <span class="er">class</span><span class="ot">=</span><span class="st">"navbar-nav"</span><span class="kw">></span></span>
<span id="cb14-21"><a href="#cb14-21" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-item"</span><span class="kw">></span></span>
<span id="cb14-22"><a href="#cb14-22" aria-hidden="true" tabindex="-1"></a> <span class="kw"><a</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/login"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Login<span class="kw"></a></span></span>
<span id="cb14-23"><a href="#cb14-23" aria-hidden="true" tabindex="-1"></a> <span class="kw"></li></span></span>
<span id="cb14-24"><a href="#cb14-24" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-item"</span><span class="kw">></span></span>
<span id="cb14-25"><a href="#cb14-25" aria-hidden="true" tabindex="-1"></a> <span class="kw"><a</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/logout"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Logout<span class="kw"></a></span></span>
<span id="cb14-26"><a href="#cb14-26" aria-hidden="true" tabindex="-1"></a> <span class="kw"></li></span></span>
<span id="cb14-27"><a href="#cb14-27" aria-hidden="true" tabindex="-1"></a> <span class="kw"></ul></span></span>
<span id="cb14-28"><a href="#cb14-28" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb14-29"><a href="#cb14-29" aria-hidden="true" tabindex="-1"></a> <span class="kw"></div></span></span>
<span id="cb14-30"><a href="#cb14-30" aria-hidden="true" tabindex="-1"></a><span class="kw"></nav></span></span></code></pre></div>
<p><strong><em>footer.component.html</em></strong> - Footer</p>
<div class="sourceCode" id="cb15"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb15-1"><a href="#cb15-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><footer</span> <span class="er">class</span><span class="ot">=</span><span class="st">"footer text-light"</span><span class="kw">></span></span>
<span id="cb15-2"><a href="#cb15-2" aria-hidden="true" tabindex="-1"></a> <span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"container align-middle text-center"</span><span class="kw">></span></span>
<span id="cb15-3"><a href="#cb15-3" aria-hidden="true" tabindex="-1"></a> <span class="kw"><i></span>Made with ❤ by <span class="kw"><a</span> <span class="er">class</span><span class="ot">=</span><span class="st">"text-light"</span> <span class="er">href</span><span class="ot">=</span><span class="st">"https://swarnadeepghosh.github.io/"</span><span class="kw">></span>Swarnadeep<span class="kw"></a></i></span></span>
<span id="cb15-4"><a href="#cb15-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"></div></span></span>
<span id="cb15-5"><a href="#cb15-5" aria-hidden="true" tabindex="-1"></a><span class="kw"></footer></span></span></code></pre></div>
<p><strong><em>footer.component.css</em></strong> - Footer</p>
<div class="sourceCode" id="cb16"><pre
class="sourceCode css"><code class="sourceCode css"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a><span class="fu">.footer</span>{</span>
<span id="cb16-2"><a href="#cb16-2" aria-hidden="true" tabindex="-1"></a> <span class="kw">position</span>: <span class="dv">absolute</span><span class="op">;</span></span>
<span id="cb16-3"><a href="#cb16-3" aria-hidden="true" tabindex="-1"></a> <span class="kw">bottom</span>: <span class="dv">0</span><span class="op">;</span></span>
<span id="cb16-4"><a href="#cb16-4" aria-hidden="true" tabindex="-1"></a> <span class="kw">width</span>: <span class="dv">100</span><span class="dt">%</span><span class="op">;</span></span>
<span id="cb16-5"><a href="#cb16-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">height</span>: <span class="dv">40</span><span class="dt">px</span><span class="op">;</span></span>
<span id="cb16-6"><a href="#cb16-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">background-color</span>: <span class="cn">#016f77</span><span class="op">;</span></span>
<span id="cb16-7"><a href="#cb16-7" aria-hidden="true" tabindex="-1"></a>}</span>
<span id="cb16-8"><a href="#cb16-8" aria-hidden="true" tabindex="-1"></a><span class="fu">.container</span>{</span>
<span id="cb16-9"><a href="#cb16-9" aria-hidden="true" tabindex="-1"></a> <span class="kw">padding</span>: <span class="dv">8</span><span class="dt">px</span><span class="op">;</span></span>
<span id="cb16-10"><a href="#cb16-10" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>error.component.html</em></strong> - For error page</p>
<div class="sourceCode" id="cb17"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"d-flex my-5 justify-content-center align-items-center align-middle"</span> <span class="er">id</span><span class="ot">=</span><span class="st">"error"</span><span class="kw">></span></span>
<span id="cb17-2"><a href="#cb17-2" aria-hidden="true" tabindex="-1"></a> <span class="kw"><h1</span> <span class="er">class</span><span class="ot">=</span><span class="st">"mr-3 pr-3 align-top border-right inline-block align-content-center"</span><span class="kw">></span>404<span class="kw"></h1></span></span>
<span id="cb17-3"><a href="#cb17-3" aria-hidden="true" tabindex="-1"></a> <span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"inline-block align-middle"</span><span class="kw">></span></span>
<span id="cb17-4"><a href="#cb17-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"><h2</span> <span class="er">class</span><span class="ot">=</span><span class="st">"font-weight-normal lead"</span> <span class="er">id</span><span class="ot">=</span><span class="st">"desc"</span><span class="kw">></span>The page you requested was not found. Please contact administrator.<span class="kw"></h2></span></span>
<span id="cb17-5"><a href="#cb17-5" aria-hidden="true" tabindex="-1"></a> <span class="kw"></div></span></span>
<span id="cb17-6"><a href="#cb17-6" aria-hidden="true" tabindex="-1"></a><span class="kw"></div></span></span></code></pre></div>
<p><strong><em>error.component.css</em></strong> - For error page</p>
<div class="sourceCode" id="cb18"><pre
class="sourceCode css"><code class="sourceCode css"><span id="cb18-1"><a href="#cb18-1" aria-hidden="true" tabindex="-1"></a><span class="pp">#error</span> { <span class="kw">height</span>: <span class="dv">100</span><span class="dt">%</span><span class="op">;</span> }</span></code></pre></div>
<h5 id="setting-bootstrap-designs">Setting Bootstrap designs</h5>
<p><strong><em>app-routing.module.ts</em></strong> - Routing Module</p>
<div class="sourceCode" id="cb19"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb19-1"><a href="#cb19-1" aria-hidden="true" tabindex="-1"></a><span class="kw">const</span> routes<span class="op">:</span> Routes <span class="op">=</span> [</span>
<span id="cb19-2"><a href="#cb19-2" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">''</span><span class="op">,</span> redirectTo<span class="op">:</span> <span class="st">'/login'</span><span class="op">,</span> pathMatch<span class="op">:</span> <span class="st">'full'</span> }<span class="op">,</span></span>
<span id="cb19-3"><a href="#cb19-3" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'login'</span><span class="op">,</span> component<span class="op">:</span> LoginComponent }<span class="op">,</span></span>
<span id="cb19-4"><a href="#cb19-4" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'welcome/:name'</span><span class="op">,</span> component<span class="op">:</span> WelcomeComponent }<span class="op">,</span></span>
<span id="cb19-5"><a href="#cb19-5" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'todos'</span><span class="op">,</span> component<span class="op">:</span> ListTodosComponent }<span class="op">,</span></span>
<span id="cb19-6"><a href="#cb19-6" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'**'</span><span class="op">,</span> component<span class="op">:</span> ErrorComponent }<span class="op">,</span></span>
<span id="cb19-7"><a href="#cb19-7" aria-hidden="true" tabindex="-1"></a>]<span class="op">;</span></span></code></pre></div>
<p><strong><em>app.component.html</em></strong></p>
<div class="sourceCode" id="cb20"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb20-1"><a href="#cb20-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><app-nav></app-nav></span></span>
<span id="cb20-2"><a href="#cb20-2" aria-hidden="true" tabindex="-1"></a><span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"container"</span><span class="kw">></span></span>
<span id="cb20-3"><a href="#cb20-3" aria-hidden="true" tabindex="-1"></a> <span class="kw"><router-outlet></router-outlet></span></span>
<span id="cb20-4"><a href="#cb20-4" aria-hidden="true" tabindex="-1"></a><span class="kw"></div></span></span>
<span id="cb20-5"><a href="#cb20-5" aria-hidden="true" tabindex="-1"></a><span class="kw"><app-footer></app-footer></span></span></code></pre></div>
<p><strong><em>list-todos.component.html</em></strong></p>
<div class="sourceCode" id="cb21"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb21-1"><a href="#cb21-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><h2></span>My Todo's<span class="kw"></h2></span></span>
<span id="cb21-2"><a href="#cb21-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb21-3"><a href="#cb21-3" aria-hidden="true" tabindex="-1"></a><span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"container"</span><span class="kw">></span></span>
<span id="cb21-4"><a href="#cb21-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"><table</span> <span class="er">class</span><span class="ot">=</span><span class="st">"table"</span><span class="kw">></span></span>
<span id="cb21-5"><a href="#cb21-5" aria-hidden="true" tabindex="-1"></a> <span class="kw"><thead></span></span>
<span id="cb21-6"><a href="#cb21-6" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tr></span></span>
<span id="cb21-7"><a href="#cb21-7" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Description<span class="kw"></th></span></span>
<span id="cb21-8"><a href="#cb21-8" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Date<span class="kw"></th></span></span>
<span id="cb21-9"><a href="#cb21-9" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Is Completed ?<span class="kw"></th></span></span>
<span id="cb21-10"><a href="#cb21-10" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tr></span></span>
<span id="cb21-11"><a href="#cb21-11" aria-hidden="true" tabindex="-1"></a> <span class="kw"></thead></span></span>
<span id="cb21-12"><a href="#cb21-12" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tbody></span></span>
<span id="cb21-13"><a href="#cb21-13" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tr</span> <span class="er">*ngFor</span><span class="ot">=</span><span class="st">"let todo of todos"</span><span class="kw">></span></span>
<span id="cb21-14"><a href="#cb21-14" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.description }}<span class="kw"></td></span></span>
<span id="cb21-15"><a href="#cb21-15" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.targetDate | date }}<span class="kw"></td></span></span>
<span id="cb21-16"><a href="#cb21-16" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.done }}<span class="kw"></td></span></span>
<span id="cb21-17"><a href="#cb21-17" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tr></span></span>
<span id="cb21-18"><a href="#cb21-18" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tbody></span></span>
<span id="cb21-19"><a href="#cb21-19" aria-hidden="true" tabindex="-1"></a> <span class="kw"></table></span></span>
<span id="cb21-20"><a href="#cb21-20" aria-hidden="true" tabindex="-1"></a><span class="kw"></div></span></span></code></pre></div>
<p><strong><em>login.component.html</em></strong></p>
<div class="sourceCode" id="cb22"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb22-1"><a href="#cb22-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><form></span></span>
<span id="cb22-2"><a href="#cb22-2" aria-hidden="true" tabindex="-1"></a> <span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"form-group"</span><span class="kw">></span></span>
<span id="cb22-3"><a href="#cb22-3" aria-hidden="true" tabindex="-1"></a> <span class="kw"><label</span> <span class="er">for</span><span class="ot">=</span><span class="st">"user"</span><span class="kw">></span>Username<span class="kw"></label></span></span>
<span id="cb22-4"><a href="#cb22-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"><input</span> <span class="er">type</span><span class="ot">=</span><span class="st">"text"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"form-control"</span> <span class="er">id</span><span class="ot">=</span><span class="st">"user"</span> <span class="er">name</span><span class="ot">=</span><span class="st">"username"</span> <span class="er">[(ngModel)]</span> <span class="ot">=</span> <span class="st">"username"</span><span class="kw">></span></span>
<span id="cb22-5"><a href="#cb22-5" aria-hidden="true" tabindex="-1"></a> <span class="kw"></div></span></span>
<span id="cb22-6"><a href="#cb22-6" aria-hidden="true" tabindex="-1"></a> <span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"form-group"</span><span class="kw">></span></span>
<span id="cb22-7"><a href="#cb22-7" aria-hidden="true" tabindex="-1"></a> <span class="kw"><label</span> <span class="er">for</span><span class="ot">=</span><span class="st">"password"</span><span class="kw">></span>Password<span class="kw"></label></span></span>
<span id="cb22-8"><a href="#cb22-8" aria-hidden="true" tabindex="-1"></a> <span class="kw"><input</span> <span class="er">type</span><span class="ot">=</span><span class="st">"password"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"form-control"</span> <span class="er">id</span><span class="ot">=</span><span class="st">"password"</span> <span class="er">name</span><span class="ot">=</span><span class="st">"password"</span> <span class="er">[(ngModel)]</span> <span class="ot">=</span> <span class="st">"password"</span><span class="kw">></span></span>
<span id="cb22-9"><a href="#cb22-9" aria-hidden="true" tabindex="-1"></a> <span class="kw"></div></span></span>
<span id="cb22-10"><a href="#cb22-10" aria-hidden="true" tabindex="-1"></a> <span class="kw"><button</span> <span class="er">type</span><span class="ot">=</span><span class="st">"submit"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"btn btn-primary"</span> <span class="er">(click)</span><span class="ot">=</span><span class="st">"handleLogin()"</span><span class="kw">></span>Login<span class="kw"></button></span></span>
<span id="cb22-11"><a href="#cb22-11" aria-hidden="true" tabindex="-1"></a> <span class="kw"><i</span> <span class="er">*ngIf</span><span class="ot">=</span><span class="st">"invalidLogin"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"text-danger m-4"</span><span class="kw">></span>Login Unsuccessful<span class="kw"></i></span></span>
<span id="cb22-12"><a href="#cb22-12" aria-hidden="true" tabindex="-1"></a><span class="kw"></form></span></span></code></pre></div>
<p><strong><em>welcome.component.html</em></strong></p>
<div class="sourceCode" id="cb23"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb23-1"><a href="#cb23-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><h1></span>Welcome!!<span class="kw"></h1></span></span>
<span id="cb23-2"><a href="#cb23-2" aria-hidden="true" tabindex="-1"></a><span class="kw"><p></span>Welcome <span class="kw"><b></span>{{ name }}<span class="kw"></b></span> to Todo Fullstack app designed with -<span class="kw"></p></span></span>
<span id="cb23-3"><a href="#cb23-3" aria-hidden="true" tabindex="-1"></a><span class="kw"><ul></span></span>
<span id="cb23-4"><a href="#cb23-4" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li></span>Frontend using Angular<span class="kw"></li></span></span>
<span id="cb23-5"><a href="#cb23-5" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li></span>Backend using Spring Boot<span class="kw"></li></span></span>
<span id="cb23-6"><a href="#cb23-6" aria-hidden="true" tabindex="-1"></a> <span class="kw"><li></span>Authentication using Spring Security<span class="kw"></li></span></span>
<span id="cb23-7"><a href="#cb23-7" aria-hidden="true" tabindex="-1"></a><span class="kw"></ul></span></span>
<span id="cb23-8"><a href="#cb23-8" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb23-9"><a href="#cb23-9" aria-hidden="true" tabindex="-1"></a><span class="kw"><p></span>You can manage all your todos <span class="kw"><a</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/todos"</span><span class="kw">><b></span>here<span class="kw"></b></a></span>.<span class="kw"></p></span></span></code></pre></div>
<h3 id="frontend-authentication">Frontend Authentication</h3>
<p>Created a service hardcodedAuth for Hardcoded Authentication.</p>
<p><code>$ ng g service hardcodedAuth</code></p>
<h5 id="hardcoded-authentication-service">Hardcoded Authentication
Service</h5>
<p><strong><em>hardcoded-auth.service.ts</em></strong> – We are
hardcoding, checking if Logged In and removing user on logout thorugh
this service.</p>
<div class="sourceCode" id="cb24"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb24-1"><a href="#cb24-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> HardcodedAuthService {</span>
<span id="cb24-2"><a href="#cb24-2" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>() {}</span>
<span id="cb24-3"><a href="#cb24-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb24-4"><a href="#cb24-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">authenticate</span>(username<span class="op">:</span> <span class="dt">string</span><span class="op">,</span> password<span class="op">:</span> <span class="dt">string</span>) {</span>
<span id="cb24-5"><a href="#cb24-5" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> (username <span class="op">===</span> <span class="st">'user'</span> <span class="op">&&</span> password <span class="op">===</span> <span class="st">'pass'</span>) {</span>
<span id="cb24-6"><a href="#cb24-6" aria-hidden="true" tabindex="-1"></a> sessionStorage<span class="op">.</span><span class="fu">setItem</span>(<span class="st">'authenticatedUser'</span><span class="op">,</span> username)<span class="op">;</span></span>
<span id="cb24-7"><a href="#cb24-7" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">true</span><span class="op">;</span></span>
<span id="cb24-8"><a href="#cb24-8" aria-hidden="true" tabindex="-1"></a> } <span class="cf">else</span> {</span>
<span id="cb24-9"><a href="#cb24-9" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">false</span><span class="op">;</span></span>
<span id="cb24-10"><a href="#cb24-10" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb24-11"><a href="#cb24-11" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb24-12"><a href="#cb24-12" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb24-13"><a href="#cb24-13" aria-hidden="true" tabindex="-1"></a> <span class="fu">isUserLoggedIn</span>() {</span>
<span id="cb24-14"><a href="#cb24-14" aria-hidden="true" tabindex="-1"></a> <span class="kw">let</span> user <span class="op">=</span> sessionStorage<span class="op">.</span><span class="fu">getItem</span>(<span class="st">'authenticatedUser'</span>)<span class="op">;</span></span>
<span id="cb24-15"><a href="#cb24-15" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="op">!</span>(user <span class="op">===</span> <span class="kw">null</span>)<span class="op">;</span></span>
<span id="cb24-16"><a href="#cb24-16" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb24-17"><a href="#cb24-17" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb24-18"><a href="#cb24-18" aria-hidden="true" tabindex="-1"></a> <span class="fu">logout</span>() { <span class="kw">let</span> user <span class="op">=</span> sessionStorage<span class="op">.</span><span class="fu">removeItem</span>(<span class="st">'authenticatedUser'</span>)<span class="op">;</span> }</span>
<span id="cb24-19"><a href="#cb24-19" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>login.component.ts</em></strong></p>
<div class="sourceCode" id="cb25"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb25-1"><a href="#cb25-1" aria-hidden="true" tabindex="-1"></a><span class="op">...</span></span>
<span id="cb25-2"><a href="#cb25-2" aria-hidden="true" tabindex="-1"></a><span class="fu">handleLogin</span>() {</span>
<span id="cb25-3"><a href="#cb25-3" aria-hidden="true" tabindex="-1"></a> <span class="co">// if (this.username === 'user' && this.password === 'pass') {</span></span>
<span id="cb25-4"><a href="#cb25-4" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> (<span class="kw">this</span><span class="op">.</span><span class="at">hardcodedAuthService</span><span class="op">.</span><span class="fu">authenticate</span>(<span class="kw">this</span><span class="op">.</span><span class="at">username</span><span class="op">,</span> <span class="kw">this</span><span class="op">.</span><span class="at">password</span>)) {</span>
<span id="cb25-5"><a href="#cb25-5" aria-hidden="true" tabindex="-1"></a><span class="op">...</span></span></code></pre></div>
<h5 id="logout-component">Logout Component</h5>
<p><strong><em>logout.component.html</em></strong></p>
<div class="sourceCode" id="cb26"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb26-1"><a href="#cb26-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><h1></span> You have successfully logged out.<span class="kw"></h1></span></span>
<span id="cb26-2"><a href="#cb26-2" aria-hidden="true" tabindex="-1"></a><span class="kw"><p></span>Thanks for using our application.<span class="kw"></p></span></span></code></pre></div>
<p><strong><em>logout.component.ts</em></strong></p>
<div class="sourceCode" id="cb27"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb27-1"><a href="#cb27-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> LogoutComponent <span class="kw">implements</span> OnInit {</span>
<span id="cb27-2"><a href="#cb27-2" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> hardcodedAuthService<span class="op">:</span> HardcodedAuthService) {}</span>
<span id="cb27-3"><a href="#cb27-3" aria-hidden="true" tabindex="-1"></a> <span class="fu">ngOnInit</span>()<span class="op">:</span> <span class="dt">void</span> { <span class="kw">this</span><span class="op">.</span><span class="at">hardcodedAuthService</span><span class="op">.</span><span class="fu">logout</span>()<span class="op">;</span> }</span>
<span id="cb27-4"><a href="#cb27-4" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<h5 id="allowing-nav-items-to-loggedin-user">Allowing Nav items to
Loggedin User</h5>
<p><strong><em>nav.component.html</em></strong> - configured the below
lines.</p>
<div class="sourceCode" id="cb28"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb28-1"><a href="#cb28-1" aria-hidden="true" tabindex="-1"></a>...</span>
<span id="cb28-2"><a href="#cb28-2" aria-hidden="true" tabindex="-1"></a><span class="kw"><a</span> <span class="er">*ngIf</span><span class="ot">=</span><span class="st">"hardcodedAuthService.isUserLoggedIn()"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/todos"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Todos<span class="kw"></a></span></span>
<span id="cb28-3"><a href="#cb28-3" aria-hidden="true" tabindex="-1"></a><span class="kw"><a</span> <span class="er">*ngIf</span><span class="ot">=</span><span class="st">"!hardcodedAuthService.isUserLoggedIn()"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/login"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Login<span class="kw"></a></span></span>
<span id="cb28-4"><a href="#cb28-4" aria-hidden="true" tabindex="-1"></a><span class="kw"><a</span> <span class="er">*ngIf</span><span class="ot">=</span><span class="st">"hardcodedAuthService.isUserLoggedIn()"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"nav-link"</span> <span class="er">routerLink</span><span class="ot">=</span><span class="st">"/logout"</span> <span class="er">routerLinkActive</span><span class="ot">=</span><span class="st">"active"</span><span class="kw">></span>Logout<span class="kw"></a></span></span>
<span id="cb28-5"><a href="#cb28-5" aria-hidden="true" tabindex="-1"></a>...</span></code></pre></div>
<p><strong><em>nav.component.ts</em></strong></p>
<div class="sourceCode" id="cb29"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb29-1"><a href="#cb29-1" aria-hidden="true" tabindex="-1"></a><span class="kw">constructor</span>(<span class="kw">public</span> hardcodedAuthService <span class="op">:</span> HardcodedAuthService) { }</span></code></pre></div>
<h3 id="routeguard-service">RouteGuard Service</h3>
<p><strong><em>route-guard.service.ts</em></strong></p>
<div class="sourceCode" id="cb30"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb30-1"><a href="#cb30-1" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { Injectable } <span class="im">from</span> <span class="st">'@angular/core'</span><span class="op">;</span></span>
<span id="cb30-2"><a href="#cb30-2" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { ActivatedRouteSnapshot<span class="op">,</span> CanActivate<span class="op">,</span> Router<span class="op">,</span> RouterStateSnapshot } <span class="im">from</span> <span class="st">'@angular/router'</span><span class="op">;</span></span>
<span id="cb30-3"><a href="#cb30-3" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { Observable } <span class="im">from</span> <span class="st">'rxjs'</span><span class="op">;</span></span>
<span id="cb30-4"><a href="#cb30-4" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { HardcodedAuthService } <span class="im">from</span> <span class="st">'./hardcoded-auth.service'</span><span class="op">;</span></span>
<span id="cb30-5"><a href="#cb30-5" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb30-6"><a href="#cb30-6" aria-hidden="true" tabindex="-1"></a>@<span class="fu">Injectable</span>({ providedIn<span class="op">:</span> <span class="st">'root'</span><span class="op">,</span>})</span>
<span id="cb30-7"><a href="#cb30-7" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> RouteGuardService <span class="kw">implements</span> CanActivate {</span>
<span id="cb30-8"><a href="#cb30-8" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> hardcodedAuthService<span class="op">:</span> HardcodedAuthService<span class="op">,</span> <span class="kw">private</span> router<span class="op">:</span> Router) {}</span>
<span id="cb30-9"><a href="#cb30-9" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb30-10"><a href="#cb30-10" aria-hidden="true" tabindex="-1"></a> <span class="fu">canActivate</span>(route<span class="op">:</span> ActivatedRouteSnapshot<span class="op">,</span> state<span class="op">:</span> RouterStateSnapshot) {</span>
<span id="cb30-11"><a href="#cb30-11" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> (<span class="kw">this</span><span class="op">.</span><span class="at">hardcodedAuthService</span><span class="op">.</span><span class="fu">isUserLoggedIn</span>()) { <span class="cf">return</span> <span class="kw">true</span><span class="op">;</span> }</span>
<span id="cb30-12"><a href="#cb30-12" aria-hidden="true" tabindex="-1"></a> <span class="cf">else</span>{</span>
<span id="cb30-13"><a href="#cb30-13" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">router</span><span class="op">.</span><span class="fu">navigate</span>([<span class="st">'/login'</span>])<span class="op">;</span></span>
<span id="cb30-14"><a href="#cb30-14" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">false</span><span class="op">;</span></span>
<span id="cb30-15"><a href="#cb30-15" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb30-16"><a href="#cb30-16" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb30-17"><a href="#cb30-17" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>app-routing.module.ts</em></strong></p>
<div class="sourceCode" id="cb31"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb31-1"><a href="#cb31-1" aria-hidden="true" tabindex="-1"></a><span class="kw">const</span> routes<span class="op">:</span> Routes <span class="op">=</span> [</span>
<span id="cb31-2"><a href="#cb31-2" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">''</span><span class="op">,</span> redirectTo<span class="op">:</span> <span class="st">'/login'</span><span class="op">,</span> pathMatch<span class="op">:</span> <span class="st">'full'</span> }<span class="op">,</span></span>
<span id="cb31-3"><a href="#cb31-3" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'login'</span><span class="op">,</span> component<span class="op">:</span> LoginComponent }<span class="op">,</span></span>
<span id="cb31-4"><a href="#cb31-4" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'welcome/:name'</span><span class="op">,</span> component<span class="op">:</span> WelcomeComponent<span class="op">,</span> canActivate<span class="op">:</span>[RouteGuardService] }<span class="op">,</span></span>
<span id="cb31-5"><a href="#cb31-5" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'todos'</span><span class="op">,</span> component<span class="op">:</span> ListTodosComponent<span class="op">,</span> canActivate<span class="op">:</span>[RouteGuardService] }<span class="op">,</span></span>
<span id="cb31-6"><a href="#cb31-6" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'logout'</span><span class="op">,</span> component<span class="op">:</span> LogoutComponent<span class="op">,</span> canActivate<span class="op">:</span>[RouteGuardService] }<span class="op">,</span></span>
<span id="cb31-7"><a href="#cb31-7" aria-hidden="true" tabindex="-1"></a> { path<span class="op">:</span> <span class="st">'**'</span><span class="op">,</span> component<span class="op">:</span> ErrorComponent }<span class="op">,</span></span>
<span id="cb31-8"><a href="#cb31-8" aria-hidden="true" tabindex="-1"></a>]<span class="op">;</span></span></code></pre></div>
<h2 id="backend">Backend</h2>
<h4 id="basic-backend-setup">Basic Backend Setup</h4>
<p>Created a Spring Boot starter project TodoFullStack using below
dependencies:</p>
<pre><code>spring-boot-starter-web
spring-boot-starter-data-jpa
spring-boot-devtools
postgresql</code></pre>
<p><strong><em>backend.java</em></strong></p>
<div class="sourceCode" id="cb33"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb33-1"><a href="#cb33-1" aria-hidden="true" tabindex="-1"></a><span class="kw">package</span><span class="im"> com</span><span class="op">.</span><span class="im">swarna</span><span class="op">.</span><span class="im">todoFullStack</span><span class="op">;</span></span>
<span id="cb33-2"><a href="#cb33-2" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="kw">class</span> HelloWorldBean <span class="op">{</span></span>
<span id="cb33-3"><a href="#cb33-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb33-4"><a href="#cb33-4" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> <span class="bu">String</span> message<span class="op">;</span></span>
<span id="cb33-5"><a href="#cb33-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> <span class="fu">HelloWorldBean</span><span class="op">(</span><span class="bu">String</span> message<span class="op">)</span> <span class="op">{</span></span>
<span id="cb33-6"><a href="#cb33-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="fu">message</span> <span class="op">=</span> message<span class="op">;</span></span>
<span id="cb33-7"><a href="#cb33-7" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb33-8"><a href="#cb33-8" aria-hidden="true" tabindex="-1"></a> <span class="co">// Auto Generated Getter, Setter and ToString below ...</span></span>
<span id="cb33-9"><a href="#cb33-9" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><strong><em>backend.java</em></strong> - Created 3 API</p>
<ul>
<li><code>/hello</code> - returns String hardcoded rsponse</li>
<li><code>/hello-bean</code> - returns new HelloWorldBean object which
has property “message”</li>
<li><code>/hello/path-variable/{name}</code> - prints path variable
also</li>
</ul>
<div class="sourceCode" id="cb34"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb34-1"><a href="#cb34-1" aria-hidden="true" tabindex="-1"></a><span class="kw">package</span><span class="im"> com</span><span class="op">.</span><span class="im">swarna</span><span class="op">.</span><span class="im">todoFullStack</span><span class="op">;</span></span>
<span id="cb34-2"><a href="#cb34-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb34-3"><a href="#cb34-3" aria-hidden="true" tabindex="-1"></a><span class="co">// Allowing localhost:4200 so that backend can be called by frontend server</span></span>
<span id="cb34-4"><a href="#cb34-4" aria-hidden="true" tabindex="-1"></a><span class="at">@CrossOrigin</span><span class="op">(</span>origins <span class="op">=</span> <span class="st">"http://localhost:4200"</span><span class="op">)</span> </span>
<span id="cb34-5"><a href="#cb34-5" aria-hidden="true" tabindex="-1"></a><span class="at">@RestController</span></span>
<span id="cb34-6"><a href="#cb34-6" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="kw">class</span> HelloController <span class="op">{</span></span>
<span id="cb34-7"><a href="#cb34-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb34-8"><a href="#cb34-8" aria-hidden="true" tabindex="-1"></a> <span class="at">@GetMapping</span><span class="op">(</span><span class="st">"hello"</span><span class="op">)</span></span>
<span id="cb34-9"><a href="#cb34-9" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> <span class="bu">String</span> <span class="fu">helloWorld</span><span class="op">()</span> <span class="op">{</span></span>
<span id="cb34-10"><a href="#cb34-10" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="st">"Hello world"</span><span class="op">;</span></span>
<span id="cb34-11"><a href="#cb34-11" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb34-12"><a href="#cb34-12" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb34-13"><a href="#cb34-13" aria-hidden="true" tabindex="-1"></a> <span class="at">@GetMapping</span><span class="op">(</span><span class="st">"hello-bean"</span><span class="op">)</span> <span class="co">// Bean is converting into JSON and send to view.</span></span>
<span id="cb34-14"><a href="#cb34-14" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> HelloWorldBean <span class="fu">helloWorldBean</span><span class="op">()</span> <span class="op">{</span></span>
<span id="cb34-15"><a href="#cb34-15" aria-hidden="true" tabindex="-1"></a> <span class="co">// throw new RuntimeException("Some error occurred. Please contact helpdesk.");</span></span>
<span id="cb34-16"><a href="#cb34-16" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">new</span> <span class="fu">HelloWorldBean</span><span class="op">(</span><span class="st">"Hello World from HelloWorldBean backend"</span><span class="op">);</span> </span>
<span id="cb34-17"><a href="#cb34-17" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb34-18"><a href="#cb34-18" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb34-19"><a href="#cb34-19" aria-hidden="true" tabindex="-1"></a> <span class="at">@GetMapping</span><span class="op">(</span><span class="st">"hello/path-variable/{name}"</span><span class="op">)</span></span>
<span id="cb34-20"><a href="#cb34-20" aria-hidden="true" tabindex="-1"></a> <span class="kw">public</span> HelloWorldBean <span class="fu">helloWorldBeanWithPathVariable</span><span class="op">(</span><span class="at">@PathVariable</span> <span class="bu">String</span> name<span class="op">)</span> <span class="op">{</span></span>
<span id="cb34-21"><a href="#cb34-21" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">new</span> <span class="fu">HelloWorldBean</span><span class="op">(</span><span class="bu">String</span><span class="op">.</span><span class="fu">format</span><span class="op">(</span><span class="st">"Hello World from Path Variable, Username : </span><span class="sc">%s</span><span class="st">"</span><span class="op">,</span> name<span class="op">));</span></span>
<span id="cb34-22"><a href="#cb34-22" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb34-23"><a href="#cb34-23" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h3 id="connnecting-backend-to-frontend">Connnecting Backend to
Frontend</h3>
<p><strong><em>app.module.ts</em></strong> - importing
HttpClientModule</p>
<div class="sourceCode" id="cb35"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb35-1"><a href="#cb35-1" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { HttpClientModule } <span class="im">from</span> <span class="st">'@angular/common/http'</span></span>
<span id="cb35-2"><a href="#cb35-2" aria-hidden="true" tabindex="-1"></a> imports<span class="op">:</span> [ <span class="op">...</span></span>
<span id="cb35-3"><a href="#cb35-3" aria-hidden="true" tabindex="-1"></a> HttpClientModule</span>
<span id="cb35-4"><a href="#cb35-4" aria-hidden="true" tabindex="-1"></a> <span class="op">...</span></span></code></pre></div>
<p><strong><em>welcome-data.service.ts</em></strong> - This will fetch
data from backend by REST-API call and share the response to angular
components.</p>
<div class="sourceCode" id="cb36"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb36-1"><a href="#cb36-1" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { HttpClient } <span class="im">from</span> <span class="st">'@angular/common/http'</span><span class="op">;</span></span>
<span id="cb36-2"><a href="#cb36-2" aria-hidden="true" tabindex="-1"></a><span class="im">import</span> { Injectable } <span class="im">from</span> <span class="st">'@angular/core'</span><span class="op">;</span></span>
<span id="cb36-3"><a href="#cb36-3" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb36-4"><a href="#cb36-4" aria-hidden="true" tabindex="-1"></a><span class="kw">class</span> HelloWorldBean {</span>
<span id="cb36-5"><a href="#cb36-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">public</span> message<span class="op">:</span> <span class="bu">String</span>) {}</span>
<span id="cb36-6"><a href="#cb36-6" aria-hidden="true" tabindex="-1"></a>}</span>
<span id="cb36-7"><a href="#cb36-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb36-8"><a href="#cb36-8" aria-hidden="true" tabindex="-1"></a>@<span class="fu">Injectable</span>({</span>
<span id="cb36-9"><a href="#cb36-9" aria-hidden="true" tabindex="-1"></a> providedIn<span class="op">:</span> <span class="st">'root'</span><span class="op">,</span></span>
<span id="cb36-10"><a href="#cb36-10" aria-hidden="true" tabindex="-1"></a>})</span>
<span id="cb36-11"><a href="#cb36-11" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> WelcomeDataService {</span>
<span id="cb36-12"><a href="#cb36-12" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> http<span class="op">:</span> HttpClient) {}</span>
<span id="cb36-13"><a href="#cb36-13" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb36-14"><a href="#cb36-14" aria-hidden="true" tabindex="-1"></a> <span class="fu">executeHelloWorldBeanService</span>() {</span>
<span id="cb36-15"><a href="#cb36-15" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">this</span><span class="op">.</span><span class="at">http</span><span class="op">.</span><span class="fu">get</span><span class="op"><</span>HelloWorldBean<span class="op">></span>(<span class="st">'http://localhost:8080/hello-bean'</span>)<span class="op">;</span></span>
<span id="cb36-16"><a href="#cb36-16" aria-hidden="true" tabindex="-1"></a> <span class="co">// returns> Observable {source: Observable, operator: ƒ} and no call in network tab</span></span>
<span id="cb36-17"><a href="#cb36-17" aria-hidden="true" tabindex="-1"></a> <span class="co">// console.log('executeHelloWorldBean');</span></span>
<span id="cb36-18"><a href="#cb36-18" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb36-19"><a href="#cb36-19" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb36-20"><a href="#cb36-20" aria-hidden="true" tabindex="-1"></a> <span class="fu">executeHelloWorldBeanServiceWithParameter</span>(name<span class="op">:</span> <span class="dt">any</span>) { <span class="co">// Fetching Path Variable from backend</span></span>
<span id="cb36-21"><a href="#cb36-21" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">this</span><span class="op">.</span><span class="at">http</span><span class="op">.</span><span class="fu">get</span><span class="op"><</span>HelloWorldBean<span class="op">></span>(<span class="vs">`http://localhost:8080/hello/path-variable/</span><span class="sc">${</span>name<span class="sc">}</span><span class="vs">`</span>)<span class="op">;</span></span>
<span id="cb36-22"><a href="#cb36-22" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb36-23"><a href="#cb36-23" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>welcome.component.ts</em></strong> - Added 2 methods to
handle success and error response, 1 method to fetch Welcome message
without parameter and 1 method to fetch Welcome message with
parameter</p>
<div class="sourceCode" id="cb37"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb37-1"><a href="#cb37-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> WelcomeComponent <span class="kw">implements</span> OnInit {</span>
<span id="cb37-2"><a href="#cb37-2" aria-hidden="true" tabindex="-1"></a> welcomeMessageFromService<span class="op">:</span> <span class="dt">string</span> <span class="op">|</span> <span class="dt">undefined</span><span class="op">;</span></span>
<span id="cb37-3"><a href="#cb37-3" aria-hidden="true" tabindex="-1"></a> <span class="op">...</span></span>
<span id="cb37-4"><a href="#cb37-4" aria-hidden="true" tabindex="-1"></a> <span class="fu">handleSuccessResponse</span>(response<span class="op">:</span> <span class="dt">any</span>) {</span>
<span id="cb37-5"><a href="#cb37-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">welcomeMessageFromService</span> <span class="op">=</span> response<span class="op">.</span><span class="at">message</span><span class="op">;</span></span>
<span id="cb37-6"><a href="#cb37-6" aria-hidden="true" tabindex="-1"></a> <span class="bu">console</span><span class="op">.</span><span class="fu">log</span>(response<span class="op">.</span><span class="at">message</span>)<span class="op">;</span></span>
<span id="cb37-7"><a href="#cb37-7" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb37-8"><a href="#cb37-8" aria-hidden="true" tabindex="-1"></a> <span class="fu">handleErrorResponse</span>(error<span class="op">:</span> <span class="dt">any</span>) {</span>
<span id="cb37-9"><a href="#cb37-9" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">welcomeMessageFromService</span> <span class="op">=</span> error<span class="op">.</span><span class="at">error</span><span class="op">.</span><span class="at">message</span><span class="op">;</span></span>
<span id="cb37-10"><a href="#cb37-10" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb37-11"><a href="#cb37-11" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb37-12"><a href="#cb37-12" aria-hidden="true" tabindex="-1"></a> <span class="fu">getWelcomeMessage</span>() {</span>
<span id="cb37-13"><a href="#cb37-13" aria-hidden="true" tabindex="-1"></a> <span class="co">// console.log(this.welcomeDataService.executeHelloWorldBeanService());</span></span>
<span id="cb37-14"><a href="#cb37-14" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">welcomeDataService</span><span class="op">.</span><span class="fu">executeHelloWorldBeanService</span>()<span class="op">.</span><span class="fu">subscribe</span>(</span>
<span id="cb37-15"><a href="#cb37-15" aria-hidden="true" tabindex="-1"></a> (response) <span class="kw">=></span> <span class="kw">this</span><span class="op">.</span><span class="fu">handleSuccessResponse</span>(response)<span class="op">,</span></span>
<span id="cb37-16"><a href="#cb37-16" aria-hidden="true" tabindex="-1"></a> (error) <span class="kw">=></span> <span class="kw">this</span><span class="op">.</span><span class="fu">handleErrorResponse</span>(error)</span>
<span id="cb37-17"><a href="#cb37-17" aria-hidden="true" tabindex="-1"></a> )<span class="op">;</span></span>
<span id="cb37-18"><a href="#cb37-18" aria-hidden="true" tabindex="-1"></a> <span class="co">// console.log('Last line of getWelcomeMessage'); // this will be print before response because observable is asynchronous call</span></span>
<span id="cb37-19"><a href="#cb37-19" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb37-20"><a href="#cb37-20" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb37-21"><a href="#cb37-21" aria-hidden="true" tabindex="-1"></a> <span class="fu">getWelcomeMessageWithParameter</span>() {</span>
<span id="cb37-22"><a href="#cb37-22" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">welcomeDataService</span></span>
<span id="cb37-23"><a href="#cb37-23" aria-hidden="true" tabindex="-1"></a> <span class="op">.</span><span class="fu">executeHelloWorldBeanServiceWithParameter</span>(<span class="kw">this</span><span class="op">.</span><span class="at">name</span>)</span>
<span id="cb37-24"><a href="#cb37-24" aria-hidden="true" tabindex="-1"></a> <span class="op">.</span><span class="fu">subscribe</span>(</span>
<span id="cb37-25"><a href="#cb37-25" aria-hidden="true" tabindex="-1"></a> (response) <span class="kw">=></span> <span class="kw">this</span><span class="op">.</span><span class="fu">handleSuccessResponse</span>(response)<span class="op">,</span></span>
<span id="cb37-26"><a href="#cb37-26" aria-hidden="true" tabindex="-1"></a> (error) <span class="kw">=></span> <span class="kw">this</span><span class="op">.</span><span class="fu">handleErrorResponse</span>(error)</span>
<span id="cb37-27"><a href="#cb37-27" aria-hidden="true" tabindex="-1"></a> )<span class="op">;</span></span>
<span id="cb37-28"><a href="#cb37-28" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb37-29"><a href="#cb37-29" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>welcome.component.html</em></strong> - created a button
that will fetch data from local backend server and show output message
in html page.</p>
<div class="sourceCode" id="cb38"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb38-1"><a href="#cb38-1" aria-hidden="true" tabindex="-1"></a><span class="op">...</span></span>
<span id="cb38-2"><a href="#cb38-2" aria-hidden="true" tabindex="-1"></a><span class="op"><</span>div <span class="kw">class</span><span class="op">=</span><span class="st">"container"</span><span class="op">></span></span>
<span id="cb38-3"><a href="#cb38-3" aria-hidden="true" tabindex="-1"></a> Click here to <span class="kw">get</span> welcome message <span class="im">from</span> backend </span>
<span id="cb38-4"><a href="#cb38-4" aria-hidden="true" tabindex="-1"></a> <span class="op"><</span><span class="fu">button</span> (click)<span class="op">=</span><span class="st">"getWelcomeMessageWithParameter()"</span> <span class="kw">class</span><span class="op">=</span><span class="st">"btn btn-primary"</span><span class="op">></span>Get Welcome Message<span class="op"></</span>button<span class="op">></span></span>
<span id="cb38-5"><a href="#cb38-5" aria-hidden="true" tabindex="-1"></a><span class="op"></</span>div<span class="op">></span></span>
<span id="cb38-6"><a href="#cb38-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb38-7"><a href="#cb38-7" aria-hidden="true" tabindex="-1"></a><span class="op"><</span>div <span class="kw">class</span><span class="op">=</span><span class="st">"container"</span> <span class="op">*</span>ngIf<span class="op">=</span><span class="st">"welcomeMessageFromService"</span><span class="op">></span></span>
<span id="cb38-8"><a href="#cb38-8" aria-hidden="true" tabindex="-1"></a> <span class="op"><</span>h3<span class="op">></span>Welcome Message <span class="op">:</span> <span class="op"></</span>h3<span class="op">></span></span>
<span id="cb38-9"><a href="#cb38-9" aria-hidden="true" tabindex="-1"></a> {{welcomeMessageFromService}}</span>
<span id="cb38-10"><a href="#cb38-10" aria-hidden="true" tabindex="-1"></a><span class="op"></</span>div<span class="op">></span></span></code></pre></div>
<h3 id="crud-operation">CRUD Operation</h3>
<table>
<colgroup>
<col style="width: 11%" />
<col style="width: 11%" />
<col style="width: 27%" />
<col style="width: 49%" />
</colgroup>
<thead>
<tr class="header">
<th>Operation</th>
<th>Request Method</th>
<th>URI</th>
<th>Returns</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Read all todos</td>
<td>GET</td>
<td>/users/{username}/todos</td>
<td>200 OK with Todo List</td>
</tr>
<tr class="even">
<td>Read one todo</td>
<td>GET</td>
<td>/users/{username}/todos/{todo_id}</td>
<td>200 OK with one Todo</td>
</tr>
<tr class="odd">
<td>Create a todo</td>
<td>POST</td>
<td>/users/{username}/todos/</td>
<td>201 CREATED</td>
</tr>
<tr class="even">
<td>Update a todo</td>
<td>PUT</td>
<td>/users/{username}/todos/{todo_id}</td>
<td>200 OK with updated Todo</td>
</tr>
<tr class="odd">
<td>Delete a todo</td>
<td>DELETE</td>
<td>/users/{username}/todos/{todo_id}</td>
<td>204 NO CONTENT => for Successful Deletion,<br/>404 NOT FOUND
=> for Todo Not Found</td>
</tr>
</tbody>
</table>
<p><strong>VsCode Lombok issue :</strong></p>
<p>Adding Lombok in <strong><em>pom.xml</em></strong></p>
<div class="sourceCode" id="cb39"><pre
class="sourceCode xml"><code class="sourceCode xml"><span id="cb39-1"><a href="#cb39-1" aria-hidden="true" tabindex="-1"></a><<span class="kw">dependency</span>></span>
<span id="cb39-2"><a href="#cb39-2" aria-hidden="true" tabindex="-1"></a> <<span class="kw">groupId</span>>org.projectlombok</<span class="kw">groupId</span>></span>
<span id="cb39-3"><a href="#cb39-3" aria-hidden="true" tabindex="-1"></a> <<span class="kw">artifactId</span>>lombok</<span class="kw">artifactId</span>></span>
<span id="cb39-4"><a href="#cb39-4" aria-hidden="true" tabindex="-1"></a> <<span class="kw">optional</span>>true</<span class="kw">optional</span>></span>
<span id="cb39-5"><a href="#cb39-5" aria-hidden="true" tabindex="-1"></a></<span class="kw">dependency</span>></span></code></pre></div>
<p>If your project loads before installing this plugin
<code>Lombok Annotations Support for VS Code</code>, you can run this
command in vscode to reload the project.</p>
<p>Press <code>Command + shift + P</code> and execute:</p>
<div class="sourceCode" id="cb40"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb40-1"><a href="#cb40-1" aria-hidden="true" tabindex="-1"></a>Java<span class="op">:</span> Clean Java language server workspace</span></code></pre></div>
<h5 id="backend-model-service-controller">Backend Model, Service,
Controller</h5>
<p><strong><em>Todo.java</em></strong></p>
<div class="sourceCode" id="cb41"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb41-1"><a href="#cb41-1" aria-hidden="true" tabindex="-1"></a><span class="at">@Data</span></span>
<span id="cb41-2"><a href="#cb41-2" aria-hidden="true" tabindex="-1"></a><span class="at">@NoArgsConstructor</span></span>
<span id="cb41-3"><a href="#cb41-3" aria-hidden="true" tabindex="-1"></a><span class="at">@AllArgsConstructor</span></span>
<span id="cb41-4"><a href="#cb41-4" aria-hidden="true" tabindex="-1"></a><span class="at">@Builder</span></span>
<span id="cb41-5"><a href="#cb41-5" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="kw">class</span> Todo <span class="op">{</span></span>
<span id="cb41-6"><a href="#cb41-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="dt">long</span> id<span class="op">;</span></span>
<span id="cb41-7"><a href="#cb41-7" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="bu">String</span> username<span class="op">;</span></span>
<span id="cb41-8"><a href="#cb41-8" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="bu">String</span> description<span class="op">;</span></span>
<span id="cb41-9"><a href="#cb41-9" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="bu">Date</span> targetDate<span class="op">;</span></span>
<span id="cb41-10"><a href="#cb41-10" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="dt">boolean</span> isDone<span class="op">;</span></span>
<span id="cb41-11"><a href="#cb41-11" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><strong><em>TodoHardCodedService.java</em></strong></p>
<div class="sourceCode" id="cb42"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb42-1"><a href="#cb42-1" aria-hidden="true" tabindex="-1"></a><span class="at">@Service</span></span>
<span id="cb42-2"><a href="#cb42-2" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="kw">class</span> TodoHardCodedService <span class="op">{</span></span>
<span id="cb42-3"><a href="#cb42-3" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="dt">static</span> <span class="bu">List</span><span class="op"><</span>Todo<span class="op">></span> todos <span class="op">=</span> <span class="kw">new</span> <span class="bu">ArrayList</span><span class="op"><>();</span></span>
<span id="cb42-4"><a href="#cb42-4" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> <span class="dt">static</span> <span class="dt">int</span> idCounter <span class="op">=</span> <span class="dv">0</span><span class="op">;</span></span>
<span id="cb42-5"><a href="#cb42-5" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb42-6"><a href="#cb42-6" aria-hidden="true" tabindex="-1"></a> <span class="dt">static</span> <span class="op">{</span></span>
<span id="cb42-7"><a href="#cb42-7" aria-hidden="true" tabindex="-1"></a> todos<span class="op">.</span><span class="fu">add</span><span class="op">(</span><span class="kw">new</span> <span class="fu">Todo</span><span class="op">(++</span>idCounter<span class="op">,</span> <span class="st">"user"</span><span class="op">,</span> <span class="st">"My first Todo"</span><span class="op">,</span> <span class="kw">new</span> <span class="bu">Date</span><span class="op">(),</span> <span class="kw">false</span><span class="op">));</span></span>
<span id="cb42-8"><a href="#cb42-8" aria-hidden="true" tabindex="-1"></a> todos<span class="op">.</span><span class="fu">add</span><span class="op">(</span><span class="kw">new</span> <span class="fu">Todo</span><span class="op">(++</span>idCounter<span class="op">,</span> <span class="st">"user"</span><span class="op">,</span> <span class="st">"Spring Boot microservices"</span><span class="op">,</span> <span class="kw">new</span> <span class="bu">Date</span><span class="op">(),</span> <span class="kw">true</span><span class="op">));</span></span>
<span id="cb42-9"><a href="#cb42-9" aria-hidden="true" tabindex="-1"></a> todos<span class="op">.</span><span class="fu">add</span><span class="op">(</span><span class="kw">new</span> <span class="fu">Todo</span><span class="op">(++</span>idCounter<span class="op">,</span> <span class="st">"user"</span><span class="op">,</span> <span class="st">"Angular"</span><span class="op">,</span> <span class="kw">new</span> <span class="bu">Date</span><span class="op">(),</span> <span class="kw">false</span><span class="op">));</span></span>
<span id="cb42-10"><a href="#cb42-10" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb42-11"><a href="#cb42-11" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><strong><em>TodoController.java</em></strong></p>
<div class="sourceCode" id="cb43"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb43-1"><a href="#cb43-1" aria-hidden="true" tabindex="-1"></a><span class="at">@CrossOrigin</span><span class="op">(</span>origins <span class="op">=</span> <span class="st">"http://localhost:4200"</span><span class="op">)</span> <span class="co">// Allowing localhost:4200 so that backend can be called by frontend server</span></span>
<span id="cb43-2"><a href="#cb43-2" aria-hidden="true" tabindex="-1"></a><span class="at">@RestController</span></span>
<span id="cb43-3"><a href="#cb43-3" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="kw">class</span> TodoController <span class="op">{</span></span>
<span id="cb43-4"><a href="#cb43-4" aria-hidden="true" tabindex="-1"></a> <span class="at">@Autowired</span></span>
<span id="cb43-5"><a href="#cb43-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">private</span> TodoHardCodedService todoService<span class="op">;</span></span>
<span id="cb43-6"><a href="#cb43-6" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h3 id="read">READ</h3>
<h5 id="readtodos-backend">ReadTodos Backend</h5>
<p><strong><em>TodoHardCodedService.java</em></strong></p>
<div class="sourceCode" id="cb44"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb44-1"><a href="#cb44-1" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="bu">List</span><span class="op"><</span>Todo<span class="op">></span> <span class="fu">getAllTodos</span><span class="op">()</span> <span class="op">{</span></span>
<span id="cb44-2"><a href="#cb44-2" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todos<span class="op">;</span></span>
<span id="cb44-3"><a href="#cb44-3" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><strong><em>TodoController.java</em></strong></p>
<div class="sourceCode" id="cb45"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb45-1"><a href="#cb45-1" aria-hidden="true" tabindex="-1"></a><span class="at">@GetMapping</span><span class="op">(</span><span class="st">"/users/{username}/todos"</span><span class="op">)</span></span>
<span id="cb45-2"><a href="#cb45-2" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> <span class="bu">List</span><span class="op"><</span>Todo<span class="op">></span> <span class="fu">getAllTodos</span><span class="op">(</span><span class="at">@PathVariable</span> <span class="bu">String</span> username<span class="op">)</span> <span class="op">{</span></span>
<span id="cb45-3"><a href="#cb45-3" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todoService<span class="op">.</span><span class="fu">getAllTodos</span><span class="op">();</span></span>
<span id="cb45-4"><a href="#cb45-4" aria-hidden="true" tabindex="-1"></a> <span class="co">// returns default 200 OK with Todo List</span></span>
<span id="cb45-5"><a href="#cb45-5" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h5 id="readtodos-frontend">ReadTodos FrontEnd</h5>
<p><strong><em>todo-data.service.ts</em></strong> - to get data from
backend</p>
<div class="sourceCode" id="cb46"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb46-1"><a href="#cb46-1" aria-hidden="true" tabindex="-1"></a>@<span class="fu">Injectable</span>({</span>
<span id="cb46-2"><a href="#cb46-2" aria-hidden="true" tabindex="-1"></a> providedIn<span class="op">:</span> <span class="st">'root'</span></span>
<span id="cb46-3"><a href="#cb46-3" aria-hidden="true" tabindex="-1"></a>})</span>
<span id="cb46-4"><a href="#cb46-4" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> TodoDataService {</span>
<span id="cb46-5"><a href="#cb46-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> http<span class="op">:</span> HttpClient) { }</span>
<span id="cb46-6"><a href="#cb46-6" aria-hidden="true" tabindex="-1"></a> <span class="fu">getAllTodos</span>(username<span class="op">:</span> <span class="dt">any</span>) {</span>
<span id="cb46-7"><a href="#cb46-7" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">this</span><span class="op">.</span><span class="at">http</span><span class="op">.</span><span class="fu">get</span><span class="op"><</span>Todo[]<span class="op">></span>(<span class="vs">`http://localhost:8080/users/</span><span class="sc">${</span>username<span class="sc">}</span><span class="vs">/todos`</span>)<span class="op">;</span></span>
<span id="cb46-8"><a href="#cb46-8" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb46-9"><a href="#cb46-9" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>list-todos.component.ts</em></strong> - to serve data
from data service to frontend</p>
<div class="sourceCode" id="cb47"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb47-1"><a href="#cb47-1" aria-hidden="true" tabindex="-1"></a><span class="im">export</span> <span class="kw">class</span> ListTodosComponent <span class="kw">implements</span> OnInit {</span>
<span id="cb47-2"><a href="#cb47-2" aria-hidden="true" tabindex="-1"></a> message<span class="op">:</span> <span class="dt">string</span> <span class="op">|</span> <span class="dt">undefined</span><span class="op">;</span></span>
<span id="cb47-3"><a href="#cb47-3" aria-hidden="true" tabindex="-1"></a> todos<span class="op">:</span> Todo[] <span class="op">=</span> []<span class="op">;</span></span>
<span id="cb47-4"><a href="#cb47-4" aria-hidden="true" tabindex="-1"></a> <span class="co">// [</span></span>
<span id="cb47-5"><a href="#cb47-5" aria-hidden="true" tabindex="-1"></a> <span class="co">// new Todo(1, 'My first Todo', true, new Date()),</span></span>
<span id="cb47-6"><a href="#cb47-6" aria-hidden="true" tabindex="-1"></a> <span class="co">// new Todo(1, 'Welcome to India', false, new Date()),</span></span>
<span id="cb47-7"><a href="#cb47-7" aria-hidden="true" tabindex="-1"></a> <span class="co">// new Todo(1, 'Angular project', true, new Date()),</span></span>
<span id="cb47-8"><a href="#cb47-8" aria-hidden="true" tabindex="-1"></a> <span class="co">// ];</span></span>
<span id="cb47-9"><a href="#cb47-9" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb47-10"><a href="#cb47-10" aria-hidden="true" tabindex="-1"></a> <span class="kw">constructor</span>(<span class="kw">private</span> todoService<span class="op">:</span> TodoDataService) {}</span>
<span id="cb47-11"><a href="#cb47-11" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb47-12"><a href="#cb47-12" aria-hidden="true" tabindex="-1"></a> <span class="fu">ngOnInit</span>()<span class="op">:</span> <span class="dt">void</span> {</span>
<span id="cb47-13"><a href="#cb47-13" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="fu">refreshTodos</span>()<span class="op">;</span></span>
<span id="cb47-14"><a href="#cb47-14" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb47-15"><a href="#cb47-15" aria-hidden="true" tabindex="-1"></a> </span>
<span id="cb47-16"><a href="#cb47-16" aria-hidden="true" tabindex="-1"></a> <span class="fu">refreshTodos</span>(){</span>
<span id="cb47-17"><a href="#cb47-17" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">todoService</span><span class="op">.</span><span class="fu">getAllTodos</span>(<span class="st">'user'</span>)<span class="op">.</span><span class="fu">subscribe</span>((response) <span class="kw">=></span> {</span>
<span id="cb47-18"><a href="#cb47-18" aria-hidden="true" tabindex="-1"></a> <span class="co">// console.log(response);</span></span>
<span id="cb47-19"><a href="#cb47-19" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">todos</span> <span class="op">=</span> response<span class="op">;</span></span>
<span id="cb47-20"><a href="#cb47-20" aria-hidden="true" tabindex="-1"></a> })<span class="op">;</span></span>
<span id="cb47-21"><a href="#cb47-21" aria-hidden="true" tabindex="-1"></a> }</span>
<span id="cb47-22"><a href="#cb47-22" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<h3 id="delete">DELETE</h3>
<h5 id="deletetodo-backend">DeleteTodo Backend</h5>
<p><strong><em>TodoHardCodedService.java</em></strong></p>
<div class="sourceCode" id="cb48"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb48-1"><a href="#cb48-1" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> Todo <span class="fu">findById</span><span class="op">(</span><span class="dt">long</span> id<span class="op">)</span> <span class="op">{</span></span>
<span id="cb48-2"><a href="#cb48-2" aria-hidden="true" tabindex="-1"></a> <span class="cf">for</span><span class="op">(</span>Todo todo <span class="op">:</span> todos<span class="op">){</span></span>
<span id="cb48-3"><a href="#cb48-3" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span><span class="op">(</span>todo<span class="op">.</span><span class="fu">getId</span><span class="op">()</span> <span class="op">==</span> id<span class="op">)</span> <span class="cf">return</span> todo<span class="op">;</span></span>
<span id="cb48-4"><a href="#cb48-4" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb48-5"><a href="#cb48-5" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">null</span><span class="op">;</span></span>
<span id="cb48-6"><a href="#cb48-6" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
<span id="cb48-7"><a href="#cb48-7" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> Todo <span class="fu">deleteById</span><span class="op">(</span><span class="dt">long</span> id<span class="op">){</span></span>
<span id="cb48-8"><a href="#cb48-8" aria-hidden="true" tabindex="-1"></a> Todo todo <span class="op">=</span> <span class="fu">findById</span><span class="op">(</span>id<span class="op">);</span></span>
<span id="cb48-9"><a href="#cb48-9" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb48-10"><a href="#cb48-10" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span><span class="op">(</span>todo <span class="op">==</span> <span class="kw">null</span><span class="op">)</span> <span class="cf">return</span> <span class="kw">null</span><span class="op">;</span></span>
<span id="cb48-11"><a href="#cb48-11" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span><span class="op">(</span>todos<span class="op">.</span><span class="fu">remove</span><span class="op">(</span>todo<span class="op">))</span> <span class="cf">return</span> todo<span class="op">;</span></span>
<span id="cb48-12"><a href="#cb48-12" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">null</span><span class="op">;</span></span>
<span id="cb48-13"><a href="#cb48-13" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><strong><em>TodoController.java</em></strong></p>
<div class="sourceCode" id="cb49"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb49-1"><a href="#cb49-1" aria-hidden="true" tabindex="-1"></a><span class="at">@DeleteMapping</span><span class="op">(</span><span class="st">"/users/{username}/todos/{id}"</span><span class="op">)</span></span>
<span id="cb49-2"><a href="#cb49-2" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> ResponseEntity<span class="op"><</span><span class="bu">Void</span><span class="op">></span> <span class="fu">deleteTodo</span><span class="op">(</span><span class="at">@PathVariable</span> <span class="bu">String</span> username<span class="op">,</span> <span class="at">@PathVariable</span> <span class="dt">long</span> id<span class="op">)</span> <span class="op">{</span></span>
<span id="cb49-3"><a href="#cb49-3" aria-hidden="true" tabindex="-1"></a> Todo todo <span class="op">=</span> todoService<span class="op">.</span><span class="fu">deleteById</span><span class="op">(</span>id<span class="op">);</span></span>
<span id="cb49-4"><a href="#cb49-4" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> <span class="op">(</span>todo <span class="op">!=</span> <span class="kw">null</span><span class="op">)</span> <span class="op">{</span></span>
<span id="cb49-5"><a href="#cb49-5" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> ResponseEntity<span class="op">.</span><span class="fu">noContent</span><span class="op">().</span><span class="fu">build</span><span class="op">();</span></span>
<span id="cb49-6"><a href="#cb49-6" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb49-7"><a href="#cb49-7" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> ResponseEntity<span class="op">.</span><span class="fu">notFound</span><span class="op">().</span><span class="fu">build</span><span class="op">();</span></span>
<span id="cb49-8"><a href="#cb49-8" aria-hidden="true" tabindex="-1"></a> <span class="co">// returns 204 no Content for successful deletion and returns 404 for not found</span></span>
<span id="cb49-9"><a href="#cb49-9" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h5 id="deletetodo-frontend">DeleteTodo FrontEnd</h5>
<p><strong><em>todo-data.service.ts</em></strong> - to get data from
backend</p>
<div class="sourceCode" id="cb50"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb50-1"><a href="#cb50-1" aria-hidden="true" tabindex="-1"></a><span class="fu">deleteTodo</span>(username<span class="op">:</span> <span class="dt">any</span><span class="op">,</span> id<span class="op">:</span> <span class="dt">number</span>) {</span>
<span id="cb50-2"><a href="#cb50-2" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">this</span><span class="op">.</span><span class="at">http</span><span class="op">.</span><span class="fu">delete</span>(<span class="vs">`http://localhost:8080/users/</span><span class="sc">${</span>username<span class="sc">}</span><span class="vs">/todos/</span><span class="sc">${</span>id<span class="sc">}</span><span class="vs">`</span>)<span class="op">;</span></span>
<span id="cb50-3"><a href="#cb50-3" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>list-todos.component.ts</em></strong> - to serve data
from data service to frontend</p>
<div class="sourceCode" id="cb51"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb51-1"><a href="#cb51-1" aria-hidden="true" tabindex="-1"></a><span class="fu">deleteTodo</span>(id<span class="op">:</span> <span class="dt">number</span>) {</span>
<span id="cb51-2"><a href="#cb51-2" aria-hidden="true" tabindex="-1"></a> <span class="bu">console</span><span class="op">.</span><span class="fu">log</span>(<span class="vs">`Todo Deleted </span><span class="sc">${</span>id<span class="sc">}</span><span class="vs">`</span>)<span class="op">;</span></span>
<span id="cb51-3"><a href="#cb51-3" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">todoService</span><span class="op">.</span><span class="fu">deleteTodo</span>(<span class="st">'user'</span><span class="op">,</span> id)<span class="op">.</span><span class="fu">subscribe</span>((response) <span class="kw">=></span> {</span>
<span id="cb51-4"><a href="#cb51-4" aria-hidden="true" tabindex="-1"></a> <span class="bu">console</span><span class="op">.</span><span class="fu">log</span>(response)<span class="op">;</span></span>
<span id="cb51-5"><a href="#cb51-5" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="at">message</span> <span class="op">=</span> <span class="vs">`Delete of Todo </span><span class="sc">${</span>id<span class="sc">}</span><span class="vs"> successful`</span><span class="op">;</span></span>
<span id="cb51-6"><a href="#cb51-6" aria-hidden="true" tabindex="-1"></a> <span class="kw">this</span><span class="op">.</span><span class="fu">refreshTodos</span>()<span class="op">;</span></span>
<span id="cb51-7"><a href="#cb51-7" aria-hidden="true" tabindex="-1"></a> })<span class="op">;</span></span>
<span id="cb51-8"><a href="#cb51-8" aria-hidden="true" tabindex="-1"></a>}</span></code></pre></div>
<p><strong><em>list-todos.component.html</em></strong></p>
<div class="sourceCode" id="cb52"><pre
class="sourceCode html"><code class="sourceCode html"><span id="cb52-1"><a href="#cb52-1" aria-hidden="true" tabindex="-1"></a><span class="kw"><h2></span>My Todo's<span class="kw"></h2></span></span>
<span id="cb52-2"><a href="#cb52-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb52-3"><a href="#cb52-3" aria-hidden="true" tabindex="-1"></a><span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"alert alert-success"</span> <span class="er">*ngIf</span><span class="ot">=</span><span class="st">"message"</span><span class="kw">></span>{{message}}<span class="kw"></div></span></span>
<span id="cb52-4"><a href="#cb52-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb52-5"><a href="#cb52-5" aria-hidden="true" tabindex="-1"></a><span class="kw"><div</span> <span class="er">class</span><span class="ot">=</span><span class="st">"container"</span><span class="kw">></span></span>
<span id="cb52-6"><a href="#cb52-6" aria-hidden="true" tabindex="-1"></a> <span class="kw"><table</span> <span class="er">class</span><span class="ot">=</span><span class="st">"table"</span><span class="kw">></span></span>
<span id="cb52-7"><a href="#cb52-7" aria-hidden="true" tabindex="-1"></a> <span class="kw"><thead></span></span>
<span id="cb52-8"><a href="#cb52-8" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tr></span></span>
<span id="cb52-9"><a href="#cb52-9" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Description<span class="kw"></th></span></span>
<span id="cb52-10"><a href="#cb52-10" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Date<span class="kw"></th></span></span>
<span id="cb52-11"><a href="#cb52-11" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Is Completed ?<span class="kw"></th></span></span>
<span id="cb52-12"><a href="#cb52-12" aria-hidden="true" tabindex="-1"></a> <span class="kw"><th></span>Delete<span class="kw"></th></span></span>
<span id="cb52-13"><a href="#cb52-13" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tr></span></span>
<span id="cb52-14"><a href="#cb52-14" aria-hidden="true" tabindex="-1"></a> <span class="kw"></thead></span></span>
<span id="cb52-15"><a href="#cb52-15" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tbody></span></span>
<span id="cb52-16"><a href="#cb52-16" aria-hidden="true" tabindex="-1"></a> <span class="kw"><tr</span> <span class="er">*ngFor</span><span class="ot">=</span><span class="st">"let todo of todos"</span><span class="kw">></span></span>
<span id="cb52-17"><a href="#cb52-17" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.description }}<span class="kw"></td></span></span>
<span id="cb52-18"><a href="#cb52-18" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.targetDate | date }}<span class="kw"></td></span></span>
<span id="cb52-19"><a href="#cb52-19" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td></span>{{ todo.done }}<span class="kw"></td></span></span>
<span id="cb52-20"><a href="#cb52-20" aria-hidden="true" tabindex="-1"></a> <span class="kw"><td><button</span> <span class="er">(click)</span><span class="ot">=</span><span class="st">"deleteTodo(todo.id)"</span> <span class="er">class</span><span class="ot">=</span><span class="st">"btn btn-danger"</span><span class="kw">></span>Delete<span class="kw"></button></td></span></span>
<span id="cb52-21"><a href="#cb52-21" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tr></span></span>
<span id="cb52-22"><a href="#cb52-22" aria-hidden="true" tabindex="-1"></a> <span class="kw"></tbody></span></span>
<span id="cb52-23"><a href="#cb52-23" aria-hidden="true" tabindex="-1"></a> <span class="kw"></table></span></span>
<span id="cb52-24"><a href="#cb52-24" aria-hidden="true" tabindex="-1"></a><span class="kw"></div></span></span></code></pre></div>
<h3 id="update">UPDATE</h3>
<h5 id="updatetodo-backend">UpdateTodo Backend</h5>
<p><strong><em>TodoHardCodedService.java</em></strong></p>
<div class="sourceCode" id="cb53"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb53-1"><a href="#cb53-1" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> Todo <span class="fu">getTodo</span><span class="op">(</span><span class="dt">long</span> id<span class="op">)</span> <span class="op">{</span> <span class="co">// This data will be populated in update frontend screen</span></span>
<span id="cb53-2"><a href="#cb53-2" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="fu">findById</span><span class="op">(</span>id<span class="op">);</span></span>
<span id="cb53-3"><a href="#cb53-3" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
<span id="cb53-4"><a href="#cb53-4" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb53-5"><a href="#cb53-5" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> Todo <span class="fu">save</span><span class="op">(</span>Todo todo<span class="op">)</span> <span class="op">{</span></span>
<span id="cb53-6"><a href="#cb53-6" aria-hidden="true" tabindex="-1"></a> <span class="cf">if</span> <span class="op">(</span>todo<span class="op">.</span><span class="fu">getId</span><span class="op">()</span> <span class="op">==</span> <span class="op">-</span><span class="dv">1</span> <span class="op">||</span> todo<span class="op">.</span><span class="fu">getId</span><span class="op">()</span> <span class="op">==</span> <span class="dv">0</span><span class="op">)</span> <span class="op">{</span> <span class="co">// Saving Todo if not exist</span></span>
<span id="cb53-7"><a href="#cb53-7" aria-hidden="true" tabindex="-1"></a> todo<span class="op">.</span><span class="fu">setId</span><span class="op">(++</span>idCounter<span class="op">);</span></span>
<span id="cb53-8"><a href="#cb53-8" aria-hidden="true" tabindex="-1"></a> todos<span class="op">.</span><span class="fu">add</span><span class="op">(</span>todo<span class="op">);</span></span>
<span id="cb53-9"><a href="#cb53-9" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span> <span class="cf">else</span> <span class="op">{</span></span>
<span id="cb53-10"><a href="#cb53-10" aria-hidden="true" tabindex="-1"></a> <span class="fu">deleteById</span><span class="op">(</span>todo<span class="op">.</span><span class="fu">getId</span><span class="op">());</span> <span class="co">// Deleting and adding Todo if already exists.</span></span>
<span id="cb53-11"><a href="#cb53-11" aria-hidden="true" tabindex="-1"></a> todos<span class="op">.</span><span class="fu">add</span><span class="op">(</span>todo<span class="op">);</span></span>
<span id="cb53-12"><a href="#cb53-12" aria-hidden="true" tabindex="-1"></a> <span class="op">}</span></span>
<span id="cb53-13"><a href="#cb53-13" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> todo<span class="op">;</span></span>
<span id="cb53-14"><a href="#cb53-14" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<p><strong><em>TodoController.java</em></strong></p>
<div class="sourceCode" id="cb54"><pre
class="sourceCode java"><code class="sourceCode java"><span id="cb54-1"><a href="#cb54-1" aria-hidden="true" tabindex="-1"></a><span class="at">@PutMapping</span><span class="op">(</span><span class="st">"/users/{username}/todos/{id}"</span><span class="op">)</span></span>
<span id="cb54-2"><a href="#cb54-2" aria-hidden="true" tabindex="-1"></a><span class="kw">public</span> ResponseEntity<span class="op"><</span>Todo<span class="op">></span> <span class="fu">updateTodo</span><span class="op">(</span><span class="at">@PathVariable</span> <span class="bu">String</span> username<span class="op">,</span> <span class="at">@PathVariable</span> <span class="dt">long</span> id<span class="op">,</span></span>
<span id="cb54-3"><a href="#cb54-3" aria-hidden="true" tabindex="-1"></a> <span class="at">@RequestBody</span> Todo todo<span class="op">)</span> <span class="op">{</span></span>
<span id="cb54-4"><a href="#cb54-4" aria-hidden="true" tabindex="-1"></a> Todo todoUpdated <span class="op">=</span> todoService<span class="op">.</span><span class="fu">save</span><span class="op">(</span>todo<span class="op">);</span></span>
<span id="cb54-5"><a href="#cb54-5" aria-hidden="true" tabindex="-1"></a> <span class="cf">return</span> <span class="kw">new</span> ResponseEntity<span class="op"><</span>Todo<span class="op">>(</span>todo<span class="op">,</span> HttpStatus<span class="op">.</span><span class="fu">OK</span><span class="op">);</span> </span>
<span id="cb54-6"><a href="#cb54-6" aria-hidden="true" tabindex="-1"></a> <span class="co">// returns 200 OK status with updated Todo</span></span>
<span id="cb54-7"><a href="#cb54-7" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h5 id="updatetodo-frontend">UpdateTodo FrontEnd</h5>
<p>We need <strong>Todo Component</strong> to <strong>Update</strong> /
<strong>Add</strong> a new Todo in Todo List.
(<code>ng generate component todo</code>)</p>
<p><strong><em>app-routing.module.ts</em></strong> - to get data from
backend</p>
<div class="sourceCode" id="cb55"><pre
class="sourceCode typescript"><code class="sourceCode typescript"><span id="cb55-1"><a href="#cb55-1" aria-hidden="true" tabindex="-1"></a>{ path<span class="op">:</span> <span class="st">'todos/:id'</span><span class="op">,</span> component<span class="op">:</span> TodoComponent<span class="op">,</span> canActivate<span class="op">:</span>[RouteGuardService] }<span class="op">,</span></span></code></pre></div>
<p><strong><em>todo-data.service.ts</em></strong> - to get data from
backend</p>
<div class="sourceCode" id="cb56"><pre