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Lynda - Learning React.js (CentOS)

React.js is a JavaScript library designed to make the process of building user interfaces more simple and intuitive. Design basic views for each state in your application, and React will efficiently update and render just the right components when your data changes.

Eve Porcello

01 What is React.js

Setting up React Developer Tools

Chrome Extensions

react-detector react developer tools

Open React Developer Tools

cmd + opt + j

02 Getting Started

React.js syntax

Adding React JS Library

React 0.14.3 (production)

<script src="https://fb.me/react-0.14.3.min.js"></script>
<script src="https://fb.me/react-dom-0.14.3.min.js"></script>

index.html

<!DOCTYPE html>
<html>
  <head>
    <script src="https://fb.me/react-0.14.3.min.js"></script>
    <script src="https://fb.me/react-dom-0.14.3.min.js"></script>
    <title>My First React File</title>
  </head>
  <body>
  <script>
    React.render(React.createElement('div', null, 'Hello World'), document.body);
  </script>
  </body>
</html>

Introducing Babel

cdnjs

The best FOSS CDN for web related libraries to speed up your websites!

https://cdnjs.com/libraries/babel-core

babel-core

A compiler for writing next generation JavaScript

https://unpkg.com/@babel/standalone/babel.min.js

index.html

<!DOCTYPE html>
<html>
<head>
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <title>My First React File</title>
</head>
<body>
<script type="text/babel">
  var HelloWorld = React.createClass({
    render: function() {
      return (
        <div>
          <h1>Hello world</h1>
          <p>This is some test</p>
        </div>
      );
    }
  });
  React.render(<HelloWorld />, document.body);
</script>
</body>
</html>

Babel on NodeJS

Setting up NodeJS

install NodeJS

sudo yum -y install nodejs

install NodeJS (macOS)

brew install node

Node JS Version

node -v
▶ v6.14.3

Setting up Babel

Install Babel CLI

sudo npm install babel-cli -g
npm list -g --depth=0

.babelrc

{
  "presets": ["latest", "react", "stage-0"]
}

Install Babel preset

npm install babel-preset-latest babel-preset-react babel-preset-stage-0 --save-dev
npm list --depth=0

Using Babel to compile JSX

src/helloworld.js

var HelloWorld = React.createClass({
  render: function() {
    return <div>
        <h1>Hello World</h1>
        <p>This is some text</p>
      </div>;
  }
});

React.render(<HelloWorld />, document.body);

Compile Directories

babel src --out-dir build
▶ src/helloworld.js -> build/helloworld.js

build/helloworld.js

"use strict";

var HelloWorld = React.createClass({
  displayName: "HelloWorld",

  render: function render() {
    return React.createElement(
      "div",
      null,
      React.createElement(
        "h1",
        null,
        "Hello World"
      ),
      React.createElement(
        "p",
        null,
        "This is some text"
      )
    );
  }
});

React.render(React.createElement(HelloWorld, null), document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <title>My First React File</title>
</head>
<body>
<script src="build/helloworld.js"></script>
</body>
</html>

03 React Components

Creating a React Component

index.html

<!DOCTYPE html>
<html>
<head>
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <title>My First React File</title>
</head>
<body>
<script type="text/babel">
  var MyComponent = React.createClass({
    render: function () {
      return <div>My Component</div>;
    }
  });
  React.render(<div>
    <MyComponent />
    <MyComponent />
    <MyComponent />
  </div>, document.body);
</script>
</body>
</html>

UsingProps

index.html

<!DOCTYPE html>
<html>
<head>
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <title>My First React File</title>
</head>
<body>
<script type="text/babel">
  var MyComponent = React.createClass({
    render: function () {
      return <div>
        <h1>{this.props.text}</h1>
        <p>{this.props.children}</p>
      </div>;
    }
  });
  React.render(<div>
    <MyComponent text="Hello World">This is a hello.</MyComponent>
    <MyComponent text="How are You?">This is a how are you.</MyComponent>
    <MyComponent text="Goodbye">This is a goodbye.</MyComponent>
  </div>, document.body);
</script>
</body>
</html>

HandlingEvents

js/note.js

var Note = React.createClass({
  edit: function () {
    alert('editing note');
  },
  remove: function () {
    alert('removeing note');
  },
  render: function () {
    return (
      <div className="note">
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  }
});
React.render(<Note>Hello World</Note>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

UsingState

js/checkbox.js

var Checkbox = React.createClass({
  getInitialState: function () {
    return {checked: true}
  },
  handleCheck: function () {
    this.setState({checked: !this.state.checked})
  },
  render: function () {
    var msg = this.state.checked ? "checked" : "unchecked";
    return (
      <div>
        <input type="checkbox" onChange={this.handleCheck} defaultChecked={this.state.checked} />
        <p>This box is {msg}.</p>
      </div>
    );
  }
});
React.render(<Checkbox />, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/checkbox.js" type="text/babel"></script>
</body>
</html>

AddingState

js/note.js

var Note = React.createClass({
  getInitialState: function() {
    return {editing: false}
  },
  edit: function() {
    this.setState({editing: true});
  },
  save: function() {
    this.setState({editing: false});
  },
  remove: function() {
    alert('removeing note');
  },
  renderDisplay: function() {
    return (
      <div className="note">
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  },
  renderForm: function() {
    return (
      <div className="note">
        <textarea defaultValue={this.props.children} className="form-control"></textarea>
        <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk"/>
      </div>
    );
  },
  render: function() {
    return this.state.editing ? this.renderForm() : this.renderDisplay();
  }
});
React.render(<Note>Hello World</Note>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

04 ParentChild Relationships

Refs

js/note.js

var Note = React.createClass({
  getInitialState: function() {
    return {editing: false}
  },
  edit: function() {
    this.setState({editing: true});
  },
  save: function() {
    var val = this.refs.newText.getDOMNode().value;
    alert("TODO: Save note value '" + val + "'");
    this.setState({editing: false});
  },
  remove: function() {
    alert('removeing note');
  },
  renderDisplay: function() {
    return (
      <div className="note">
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  },
  renderForm: function() {
    return (
      <div className="note">
        <textarea ref="newText" defaultValue={this.props.children} className="form-control"></textarea>
        <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk"/>
      </div>
    );
  },
  render: function() {
    return this.state.editing ? this.renderForm() : this.renderDisplay();
  }
});
React.render(<Note>Hello World</Note>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

PropTypes

js/note.js

var Board = React.createClass({
  propTypes: {
    count: function(props, propName) {
      if (typeof props[propName] !== "number") {
        return new Error("The count property must be a number");
      }
      if (props[propName] > 100) {
        return new Error("Creating " + props[propName] + " notes is ridiculous");
      }
    }
  },
  render: function() {
    return <div className="board">{this.props.count}</div>
  }
});
React.render(<Note>Hello World</Note>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

ChildElements

js/note.js

var Note = React.createClass({
  getInitialState: function() {
    return {editing: false}
  },
  edit: function() {
    this.setState({editing: true});
  },
  save: function() {
    var val = this.refs.newText.getDOMNode().value;
    alert("TODO: Save note value '" + val + "'");
    this.setState({editing: false});
  },
  remove: function() {
    alert('removeing note');
  },
  renderDisplay: function() {
    return (
      <div className="note">
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  },
  renderForm: function() {
    return (
      <div className="note">
        <textarea ref="newText" defaultValue={this.props.children} className="form-control"></textarea>
        <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk"/>
      </div>
    );
  },
  render: function() {
    return this.state.editing ? this.renderForm() : this.renderDisplay();
  }
});

var Board = React.createClass({
  propTypes: {
    count: function(props, propName) {
      if (typeof props[propName] !== "number") {
        return new Error("The count property must be a number");
      }
      if (props[propName] > 100) {
        return new Error("Creating " + props[propName] + " notes is ridiculous");
      }
    }
  },
  getInitialState: function() {
    return {
      notes: [
        'Call Bill',
        'Email Lisa',
        'Make dentist appt',
        'Send Proposal'
      ]
    }
  },
  render: function() {
    return (
      <div className="board">
        {this.state.notes.map(function(note, i){
          return (<Note key={i}>{note}</Note>);
        })}
      </div>
    );
  }
});
React.render(<Board count={10}/>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

Updating RemovingNotes

js/note.js

var Note = React.createClass({
  getInitialState: function() {
    return {editing: false}
  },
  edit: function() {
    this.setState({editing: true});
  },
  save: function() {
    this.props.onChange(this.refs.newText.getDOMNode().value, this.props.index);
    this.setState({editing: false});
  },
  remove: function() {
    this.props.onRemove(this.props.index);
  },
  renderDisplay: function() {
    return (
      <div className="note">
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  },
  renderForm: function() {
    return (
      <div className="note">
        <textarea ref="newText" defaultValue={this.props.children} className="form-control"></textarea>
        <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk"/>
      </div>
    );
  },
  render: function() {
    return this.state.editing ? this.renderForm() : this.renderDisplay();
  }
});

var Board = React.createClass({
  propTypes: {
    count: function(props, propName) {
      if (typeof props[propName] !== "number") {
        return new Error("The count property must be a number");
      }
      if (props[propName] > 100) {
        return new Error("Creating " + props[propName] + " notes is ridiculous");
      }
    }
  },
  getInitialState: function() {
    return {
      notes: [
        'Call Bill',
        'Email Lisa',
        'Make dentist appt',
        'Send Proposal'
      ]
    }
  },
  update: function(newText, i) {
    var arr = this.state.notes;
    arr[i] = newText;
    this.setState({notes:arr});
  },
  remove: function(i) {
    var arr = this.state.notes;
    arr.splice(i, 1);
    this.setState({notes:arr});
  },
  eachNote: function(note, i) {
    return (
      <Note key={i}
            index={i}
            onChange={this.update}
            onRemove={this.remove}
      >{note}</Note>
    );
  },
  render: function() {
    return (<div className="board">
        {this.state.notes.map(this.eachNote)}
      </div>
    );
  }
});
React.render(<Board count={10}/>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

AddingNotes

js/note.js

var Note = React.createClass({
  getInitialState: function() {
    return {editing: false}
  },
  edit: function() {
    this.setState({editing: true});
  },
  save: function() {
    this.props.onChange(this.refs.newText.getDOMNode().value, this.props.index);
    this.setState({editing: false});
  },
  remove: function() {
    this.props.onRemove(this.props.index);
  },
  renderDisplay: function() {
    return (
      <div className="note">
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  },
  renderForm: function() {
    return (
      <div className="note">
        <textarea ref="newText" defaultValue={this.props.children} className="form-control"></textarea>
        <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk"/>
      </div>
    );
  },
  render: function() {
    return this.state.editing ? this.renderForm() : this.renderDisplay();
  }
});

var Board = React.createClass({
  propTypes: {
    count: function(props, propName) {
      if (typeof props[propName] !== "number") {
        return new Error("The count property must be a number");
      }
      if (props[propName] > 100) {
        return new Error("Creating " + props[propName] + " notes is ridiculous");
      }
    }
  },
  getInitialState: function() {
    return {
      notes: []
    }
  },
  add: function(text) {
    var arr = this.state.notes;
    arr.push(text);
    this.setState({notes: arr});
  },
  update: function(newText, i) {
    var arr = this.state.notes;
    arr[i] = newText;
    this.setState({notes: arr});
  },
  remove: function(i) {
    var arr = this.state.notes;
    arr.splice(i, 1);
    this.setState({notes: arr});
  },
  eachNote: function(note, i) {
    return (
      <Note key={i}
            index={i}
            onChange={this.update}
            onRemove={this.remove}
      >{note}</Note>
    );
  },
  render: function() {
    return (<div className="board">
        {this.state.notes.map(this.eachNote)}
        <button className="btn btn-sm btn-success glyphicon glyphicon-plus"
                onClick={this.add.bind(null, "New Note")}/>
      </div>
    );
  }
});
React.render(<Board count={10}/>, document.body);

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

Keys

js/note.js

var Note = React.createClass({
  getInitialState: function() {
    return {editing: false}
  },
  componentWillMount: function() {
    this.style = {
      right: this.radomBetween(0, window.innerWidth - 150) + 'px',
      top: this.radomBetween(0, window.innerHeight - 150) + 'px',
      transform: 'rotate(' + this.radomBetween(-15, 50) + 'deg)'
    };
  },
  radomBetween: function(min, max) {
    return (min + Math.ceil(Math.random() * max));
  },
  edit: function() {
    this.setState({editing: true});
  },
  save: function() {
    this.props.onChange(this.refs.newText.getDOMNode().value, this.props.index);
    this.setState({editing: false});
  },
  remove: function() {
    this.props.onRemove(this.props.index);
  },
  renderDisplay: function() {
    return (
      <div className="note" style={this.style}>
        <p>{this.props.children}</p>
        <span>
          <button onClick={this.edit} className="btn btn-primary glyphicon glyphicon-pencil"/>
          <button onClick={this.remove} className="btn btn-danger glyphicon glyphicon-trash"/>
        </span>
      </div>
    );
  },
  renderForm: function() {
    return (
      <div className="note" style={this.style}>
        <textarea ref="newText" defaultValue={this.props.children} className="form-control"></textarea>
        <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk"/>
      </div>
    );
  },
  render: function() {
    return this.state.editing ? this.renderForm() : this.renderDisplay();
  }
});

var Board = React.createClass({
  propTypes: {
    count: function(props, propName) {
      if (typeof props[propName] !== "number") {
        return new Error("The count property must be a number");
      }
      if (props[propName] > 100) {
        return new Error("Creating " + props[propName] + " notes is ridiculous");
      }
    }
  },
  getInitialState: function() {
    return {
      notes: []
    }
  },
  nextId: function() {
    this.uniqueId = this.uniqueId || 0;
    this.uniqueId++;
  },
  add: function(text) {
    var arr = this.state.notes;
    arr.push({
      id: this.nextId(),
      note: text
    });
    this.setState({notes: arr});
  },
  update: function(newText, i) {
    var arr = this.state.notes;
    arr[i].note = newText;
    this.setState({notes: arr});
  },
  remove: function(i) {
    var arr = this.state.notes;
    arr.splice(i, 1);
    this.setState({notes: arr});
  },
  eachNote: function(note, i) {
    return (
      <Note key={note.id}
            index={i}
            onChange={this.update}
            onRemove={this.remove}
      >{note.note}</Note>
    );
  },
  render: function() {
    return (<div className="board">
        {this.state.notes.map(this.eachNote)}
        <button className="btn btn-sm btn-success glyphicon glyphicon-plus"
                onClick={this.add.bind(null, "New Note")}/>
      </div>
    );
  }
});
React.render(<Board count={10}/>, document.body);

css/style.css

div.note {
  height: 150px;
  width: 150px;
  background-color: yellow;
  margin: 2px 0;
  position: absolute;
  cursor: -webkit-grab;
  -webkit-box-shadow: 5px 5px 15px 0 rgba(0, 0, 0, .2);
  box-shadow: 5px 5px 15px 0 rgba(0, 0, 0, .2);
}

index.html

<!DOCTYPE html>
<html>
<head>
  <!-- jQuery, jQuery.ui -->
  <link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.min.css" rel="stylesheet" type="text/css" />
  <script src="https://code.jquery.com/jquery.min.js"></script>
  <script src="https://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>

  <!-- Bootstrap -->
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>

  <!-- React -->
  <script src="https://fb.me/react-0.14.3.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

  <!--Custom Styles -->
  <link href="css/style.css" rel="stylesheet" type="text/css" />
  <title>React Bulletin Board</title>
</head>
<body>
<script src="js/note.js" type="text/babel"></script>
</body>
</html>

05 Component Life Cycle

Mounting

css/style.css

div {
  background-color: blue;
  height: 200px;
  width: 200px;
}

index.html

<!DOCTYPE html>
<html>
<head>
  <title>Component Lifecycle</title>
  <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <link href="css/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<script type="text/babel">
  class Box extends React.Component {
    componentWillMount() {
      alert("component is about to mount");
    }

    componentDidMount() {
      alert('component has mounted');
    }

    handleClick() {
      ReactDOM.unmountComponentAtNode(document.body);
      alert('component is unmounted');
    }

    render() {
      return <div onClick={this.handleClick}></div>;
    }
  }
  ReactDOM.render(<Box />, document.body);
</script>
</body>
</html>

Setting Props

index.html

<!DOCTYPE html>
<html>
<head>
  <title>Component Lifecycle</title>
  <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
</head>
<body>
<script type="text/babel">
  class Box extends React.Component {
    constructor(props) {
      super(props);
      this.state = {
        backgroundColor: "red",
        height: 200,
        width: 200
      };
    }

    render() {
      return (
        <div style={this.state}></div>
      );
    }
  }

  ReactDOM.render(<Box />, document.body);
</script>
</body>
</html>

Updating Components

index.html

<!DOCTYPE html>
<html>
<head>
  <title>Component Lifecycle</title>
  <script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <link href="css/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<script type="text/babel">
  class Box extends React.Component {
    static defaultProps = {
      colorIndex: -1
    };

    constructor(props) {
      super(props);

      this.state = {
        backgroundColor: "Blue"
      };

      this.setNextColor = this.setNextColor.bind(this);
    }

    setNextColor() {
      var colors = this.props.colors.split(', ');
      this.props.colorIndex = (this.props.colorIndex + 1) % colors.length;
      this.setState({ backgroundColor: colors[this.props.colorIndex] });
    }

    render() {
      return (
        <div style={this.state} onClick={this.setNextColor}>{this.state.backgroundColor}</div>
      );
    }
  }

  ReactDOM.render(<Box colors="Red, DarkMagenta, Salmon, Chartreuse, Blue" />, document.body);
</script>
</body>
</html>

Lifecycle Functions

js/note.js

var Note = React.createClass({
    getInitialState: function() {
        return {editing: false}
    },
    componentWillMount: function() {
        this.style = {
            right: this.randomBetween(0, window.innerWidth - 150) + 'px',
            top: this.randomBetween(0, window.innerHeight - 150) + 'px',
            transform: 'rotate(' + this.randomBetween(-15, 15) + 'deg)'
        };
    },
    componentDidMount: function(){
        $(this.getDOMNode()).draggable();
    },
    randomBetween: function(min, max) {
        return (min + Math.ceil(Math.random() * max));
    },
    edit: function() {
        this.setState({editing: true});
    },
    save: function() {
        this.props.onChange(this.refs.newText.getDOMNode().value, this.props.index);
        this.setState({editing: false});
    },
    remove: function() {
        this.props.onRemove(this.props.index);
    },
    renderDisplay: function() {
        return (
            <div className="note"
                style={this.style}>
                <p>{this.props.children}</p>
                <span>
                    <button onClick={this.edit}
                            className="btn btn-primary glyphicon glyphicon-pencil"/>
                    <button onClick={this.remove}
                            className="btn btn-danger glyphicon glyphicon-trash"/>
                </span>
            </div>
            );
    },
    renderForm: function() {
        return (
            <div className="note" style={this.style}>
            <textarea ref="newText" defaultValue={this.props.children} 
            className="form-control"></textarea>
            <button onClick={this.save} className="btn btn-success btn-sm glyphicon glyphicon-floppy-disk" />
            </div>
            )
    },
    render: function() {
        if (this.state.editing) {
            return this.renderForm();
        }
        else {
            return this.renderDisplay();
        }
    }
});

var Board = React.createClass({
    propTypes: {
        count: function(props, propName) {
            if (typeof props[propName] !== "number"){
                return new Error('The count property must be a number');
            }
            if (props[propName] > 100) {
                return new Error("Creating " + props[propName] + " notes is ridiculous");
            }
        }
    },
    getInitialState: function() {
        return {
            notes: []
        };
    },
    nextId: function() {
        this.uniqueId = this.uniqueId || 0;
        return this.uniqueId++;
    },
    componentWillMount: function() {
        var self = this;
        if(this.props.count) {
            $.getJSON("http://baconipsum.com/api/?type=all-meat&sentences=" +
                this.props.count + "&start-with-lorem=1&callback=?", function(results){
                    results[0].split('. ').forEach(function(sentence){
                        self.add(sentence.substring(0,40));
                    });
                });
        }
    },
    add: function(text) {
        var arr = this.state.notes;
        arr.push({
            id: this.nextId(),
            note: text
        });
        this.setState({notes: arr});
    },
    update: function(newText, i) {
        var arr = this.state.notes;
        arr[i].note = newText;
        this.setState({notes:arr});
    },
    remove: function(i) {
        var arr = this.state.notes;
        arr.splice(i, 1);
        this.setState({notes: arr});
    },
    eachNote: function(note, i) {
        return (
                <Note key={note.id}
                    index={i}
                    onChange={this.update}
                    onRemove={this.remove}
                >{note.note}</Note>
            );
    },
    render: function() {
        return (<div className="board">
                    {this.state.notes.map(this.eachNote)}
                    <button className="btn btn-sm btn-success glyphicon glyphicon-plus"
                            onClick={this.add.bind(null, "New Note")}/>
            </div>

        );
    }
});


React.render(<Board count={50}/>, document.getElementById('react-container'));

Convert to webpack + Coffeescript + SCSS + Pug.

Files and directories.

lynda-learning-react-js
  ├── package.json
  ├── postcss.config.js
  ├── webpack.config.js
  └── src
      ├── components
      │   ├── Board.coffee
      │   └── Note.coffee
      ├── index.coffee
      ├── index.pug
      └── stylesheets
          ├── fonts.scss
          └── style.scss

package.json

{
  "name": "lynda-learning-react",
  "version": "1.0.0",
  "private": true,
  "main": "index.js",
  "scripts": {
    "prestart": "webpack",
    "start": "./node_modules/.bin/webpack-dev-server"
  },
  "devDependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.3.4",
    "@babel/preset-env": "^7.3.4",
    "autoprefixer": "^9.4.7",
    "babel-loader": "^8.0.5",
    "bootstrap": "^4.3.1",
    "coffee-loader": "^0.9.0",
    "coffeescript": "^2.3.2",
    "css-loader": "^2.1.0",
    "cssnano": "^4.1.8",
    "html-webpack-plugin": "^3.2.0",
    "node-sass": "^4.11.0",
    "postcss-loader": "^3.0.0",
    "pug": "^2.0.3",
    "pug-loader": "^2.4.0",
    "react-dom-factories": "^1.0.2",
    "sass-loader": "^7.1.0",
    "style-loader": "^0.23.1",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.2.3",
    "webpack-dev-server": "^3.2.1"
  },
  "dependencies": {
    "jquery": "^3.3.1",
    "jquery-ui": "^1.12.1",
    "popper.js": "^1.14.7",
    "react": "^16.8.4",
    "react-dom": "^16.8.4",
    "react-icons": "^3.5.0"
  }
}

postcss.config.js

module.exports = {
  plugins: {
    'autoprefixer': {},
    'cssnano': {}
  }
};

webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  mode: "development",
  entry: './src/index.coffee',
  output: {
    path: path.resolve(__dirname, 'docs/assets'),
    publicPath: '/assets/',
    filename: 'bundle.js'
  },
  devServer: {
    inline: true,
    contentBase: './docs',
    port: 3000,
    https: true,
    headers: {
      'Access-Control-Allow-Origin': '*'
    }
  },
  module: {
    rules: [{
      test: /\.pug$/,
      use: ['pug-loader']
    },{
      test: /\.coffee$/,
      use: [
        {
          loader: 'coffee-loader',
          options: {
            transpile: {
              presets: ['@babel/preset-env']
            }
          }
        }
      ]
    },{
      test: /\.scss$/,
      use: ['style-loader', 'css-loader', 'postcss-loader', 'sass-loader']
    }]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, 'src/index.pug'),
      filename: path.resolve(__dirname, 'docs/index.html')
    })
  ]
};

src/components/Board.coffee

import {Component, createElement as ele} from 'react'
import {div, button} from 'react-dom-factories'
import {Note} from './Note.coffee'
import {FaPlus} from 'react-icons/fa'
import $ from 'jquery'

export class Board extends Component

  constructor: (props) ->
    super(props)
    this.state = {
      notes: []
    }

    this.updateNote = this.updateNote.bind(this)
    this.removeNote = this.removeNote.bind(this)

  nextId: ->
    this.uniqueId ||= 0
    this.uniqueId++

  addNote: (text) ->
    this.state.notes.push({ id: this.nextId(), note: text.substring(0, 40) })
    this.setState { notes: this.state.notes }

  updateNote: (newText, i) ->
    this.state.notes[i].note = newText
    this.setState { notes: this.state.notes }

  removeNote: (i) ->
    this.state.notes.splice(i, 1)
    this.setState { notes: this.state.notes }

  componentWillMount: ->
    self = this

    if this.props.count
      $.getJSON "https://baconipsum.com/api/?type=all-meat&sentences=#{this.props.count}&start-with-lorem=1&callback=?"
        .done (results) ->
          results[0].split('. ').forEach (note) ->
            self.addNote(note)

  render: ->
    self = this

    div { className: 'board' },
      this.state.notes.map (note, i) ->
        ele Note, { key: note.id, index: i, onChange: self.updateNote, onRemove: self.removeNote },
          note.note
      button { className: 'btn btn-sm btn-success', onClick: this.addNote.bind(this, 'New Note') },
        FaPlus null

Board.propTypes =
  count: (props, propName) ->
    if typeof props[propName] != 'number'
      new Error('The count property must be a number.')
    if props[propName] > 100
      new Error("Creating #{props[propName]} notes is ridiculous.")

src/components/Note.coffee

import {Component} from 'react'
import {findDOMNode} from 'react-dom'
import {div, p, span, textarea, button} from 'react-dom-factories'
import {FaPen, FaTrashAlt} from 'react-icons/fa'
import {IoIosSave} from 'react-icons/io'
import $ from 'jquery'

randomBetween = (min, max) ->
  min + Math.ceil(Math.random() * max)

export class Note extends Component

  constructor: (props) ->
    super(props)
    this.state = {
      editing: false
    }

    this.edit = this.edit.bind(this)
    this.remove = this.remove.bind(this)

  componentWillMount: ->
    this.style = {
      right: randomBetween(0, window.innerWidth - 150) + 'px'
      top: randomBetween(0, window.innerHeight - 150) + 'px'
      transform: 'rotate(' + randomBetween(-15, 50) + 'deg)'
    }

  componentDidMount: ->
    $(findDOMNode(this)).draggable({ addClasses: false })

  edit: ->
    this.setState { editing: true }

  saveNote: ->
    this.props.onChange($(findDOMNode(this.refs.newText)).val(), this.props.index)
    this.setState { editing: false }

  remove: ->
    this.props.onRemove(this.props.index)

  renderDisplay: ->
    div { className: 'note', style: this.style },
      p null, this.props.children
      span null,
        button { className: 'btn btn-primary', onClick: this.edit },
          FaPen null
        button { className: 'btn btn-danger', onClick: this.remove },
          FaTrashAlt null

  renderForm: ->
    div { className: 'note', style: this.style },
      textarea { className: 'form-control', ref: 'newText', defaultValue: this.props.children }
      button { className: 'btn btn-success btn-sm', onClick: this.saveNote.bind(this) },
        IoIosSave null

  render: ->
    if this.state.editing then this.renderForm()  else this.renderDisplay()

src/index.coffee

import {createElement as ele} from 'react'
import {render} from 'react-dom'
import {Board} from './components/Board.coffee'
import './stylesheets/style.scss'
import 'jquery-ui/ui/widgets/draggable'

render ele(Board, { count: 20 }), document.getElementById('page')

src/index.pug

doctype html
head
  meta(charset='UTF-8')
  title React Bulletin Board
#page

Please find fonts.scss and style.scss

Convert to webpack + Coffeescript + SCSS + Pug.