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lesson1.html
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<html>
<head>
<title>Syntax, Componets, Properties, State, Events</title>
<link href="lib/bootstrap.css" rel="stylesheet" />
<link href="lib/prism.css" rel="stylesheet" />
<link href="lib/style.css" rel="stylesheet" type="text/css" media="all" />
<script src="lib/lodash.min.js"></script>
<script src="lib/react.js"></script>
<script src="lib/prism.js"></script>
<script src="lib/JSXTransformer.js"></script>
<script src="lib/sourceview.js"></script>
<script type="text/plain" id="jsxSyntaxSource">
/** @jsx React.DOM */
<tagname property=value>children</tagname>
</script>
<script type="text/plain" id="jsxTanslatedSyntaxSource">
React.DOM.tagname(properties, children)
</script>
<script type="text/jsx" id="defineRenderSource">
/** @jsx React.DOM */
var UberTag = React.createClass({
render: function() {
return <h3>{this.props.children}</h3>;
}
});
React.renderComponent(
<UberTag>Hello World</UberTag>,
document.getElementById('defineRender')
);
</script>
<script type="text/jsx" id="definePropsSource">
/** @jsx React.DOM */
var UberTag = React.createClass({
//document that we take a prefix property, validates.
propTypes: {
prefix: React.PropTypes.renderable
},
getDefaultProps: function() {
return {
prefix: "Hello"
}
},
render: function() {
return <p>
<span>{this.props.prefix} </span>
{this.props.children}
</p>;
}
});
React.renderComponent(
<UberTag prefix="Greetings">John Smith</UberTag>,
document.getElementById('defineProps')
);
</script>
<script type="text/jsx" id="defineClickHandlerSource">
/** @jsx React.DOM */
var UberTag = React.createClass({
getInitialState: function() {
return {
clicks: this.props.clicks || 0
};
},
increment: function(event) {
this.setState({clicks: this.state.clicks + 1});
},
render: function() {
return <div>
<button onClick={this.increment}>{this.props.children}</button>
{this.state.clicks ? <span>Number of clicks: {this.state.clicks} </span> : null}
</div>;
}
});
React.renderComponent(
<UberTag clicks={-1}>Hello World</UberTag>,
document.getElementById('defineClickHandler')
);
</script>
</head>
<body>
<section class="container">
<h1>Your Sanbox</h1>
<div class="row">
<div class="col-sm-12">
<p>
Most of the code on the pages is live editable. An explanation for how the code viewer works is at the end of lesson 2.
<a href="./basic.html">basic.html</a> has been created for you so that you can experiment in creating your own components in an environment that is already setup.
</p>
</div>
</div>
</section>
<section class="container">
<h1>Application as a hierarchy of components</h1>
<div class="row">
<div class="col-sm-12">
<p>
A web application is presented by defining a structural DOM to be rendered.
When the state of the application changes, perhaps due to a user event, the DOM
structure changes to represent the new state. React.js divides up the DOM rendering
and interactivity into components with each component being responsible for its own
state and presentation.
</p>
</div>
</div>
</section>
<section class="container">
<h1>Components as Actors</h1>
<div class="row">
<div class="col-sm-4">
<ul>
<li>A component is dependent on three state containers: context, props, state</li>
<li>Components render a Virtual DOM that is applied to the UI</li>
<li>Whenever a component's state container changes it is rerendered</li>
<li>Messages may be received and trigger state changes</li>
<li>Components may have callbacks set in context or props</li>
</ul>
</div>
<div class="col-sm-8">
<img style="width: 100%;" src="data:image/svg+xml;base64,<?xml version="1.0"?>
<svg width="910" height="400" xmlns="http://www.w3.org/2000/svg">
 <!-- Created with Method Draw - http://github.com/duopixel/Method-Draw/ -->
 <g>
  <title>background</title>
  <rect fill="#fff" id="canvas_background" height="402" width="912" y="-1" x="-1"/>
  <g display="none" overflow="visible" y="0" x="0" height="100%" width="100%" id="canvasGrid">
   <rect fill="url(#gridpattern)" stroke-width="0" y="0" x="0" height="100%" width="100%"/>
  </g>
 </g>
 <g>
  <title>Layer 1</title>
  <rect stroke="#000" id="svg_2" height="262.000003" width="183.000006" y="54.499997" x="198.999999" stroke-width="1.5" fill="#fff"/>
  <ellipse ry="37.5" rx="68" id="svg_3" cy="104" cx="291" fill-opacity="null" stroke-opacity="null" stroke-width="1.5" stroke="#000" fill="#fff"/>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_4" y="111.5" x="253" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">context</text>
  <ellipse ry="35.5" rx="65.5" id="svg_5" cy="194" cx="290.5" fill-opacity="null" stroke-opacity="null" stroke-width="1.5" stroke="#000" fill="#fff"/>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_6" y="202.5" x="261" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">props</text>
  <ellipse ry="30.5" rx="63.5" id="svg_7" cy="273" cx="292.5" fill-opacity="null" stroke-opacity="null" stroke-width="1.5" stroke="#000" fill="#fff"/>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_8" y="279.5" x="264" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">state</text>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_9" y="112.5" x="64" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">Global</text>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_10" y="198.5" x="60" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">Parent</text>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_11" y="45.5" x="229" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">Component</text>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_16" y="202.5" x="678" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">Virtual DOM</text>
  <path id="svg_17" d="m390.633575,208.809235l8.879883,-8.973145l-17.166748,0l-17.166748,0l0,-5.554428l0,-5.554428l16.968506,0c9.334473,0 16.970215,-0.281128 16.970215,-0.625366c0,-0.344238 -3.715332,-4.381866 -8.256104,-8.973145l-8.256104,-8.347061l7.630615,0l7.632324,0l11.655273,11.761475l11.655273,11.760757l-11.67749,11.739243l-11.67749,11.738525l-8.035645,0l-8.033936,0l8.878174,-8.972427l0,0z" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000"/>
  <path id="svg_18" d="m179.633575,119.809235l8.879883,-8.973145l-17.166748,0l-17.166748,0l0,-5.554428l0,-5.554428l16.968506,0c9.334473,0 16.970215,-0.281128 16.970215,-0.625366c0,-0.344238 -3.715332,-4.381866 -8.256104,-8.973145l-8.256104,-8.347061l7.630615,0l7.632324,0l11.655273,11.761475l11.655273,11.760757l-11.67749,11.739243l-11.67749,11.738525l-8.035645,0l-8.033936,0l8.878174,-8.972427l0,0z" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000"/>
  <path id="svg_19" d="m180.633575,207.809235l8.879883,-8.973145l-17.166748,0l-17.166748,0l0,-5.554428l0,-5.554428l16.968506,0c9.334473,0 16.970215,-0.281128 16.970215,-0.625366c0,-0.344238 -3.715332,-4.381866 -8.256104,-8.973145l-8.256104,-8.347061l7.630615,0l7.632324,0l11.655273,11.761475l11.655273,11.760757l-11.67749,11.739243l-11.67749,11.738525l-8.035645,0l-8.033936,0l8.878174,-8.972427l0,0z" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000"/>
  <path stroke="#000" id="svg_24" d="m430,194l67.5,-76l67.5,76l-67.5,76l-67.5,-76z" stroke-width="4" fill="#ffffff"/>
  <text xml:space="preserve" text-anchor="left" font-family="Helvetica, Arial, sans-serif" font-size="24" id="svg_21" y="200.5" x="454" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000">render()</text>
  <path id="svg_22" d="m601.633606,208.809235l8.879822,-8.973145l-17.166687,0l-17.166748,0l0,-5.554428l0,-5.554428l16.968506,0c9.334412,0 16.970154,-0.281128 16.970154,-0.625366c0,-0.344238 -3.715332,-4.381866 -8.256104,-8.973145l-8.256104,-8.347061l7.630615,0l7.632324,0l11.655273,11.761475l11.655334,11.760757l-11.677551,11.739243l-11.67749,11.738525l-8.035645,0l-8.033936,0l8.878235,-8.972427l0,0z" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000"/>
  <path id="svg_23" d="m811.324463,105.908432c-18.263611,-14.626495 -37.9328,-26.351868 -54.02771,-27.933975c-0.892578,-0.106659 -1.785034,-0.159988 -2.806946,-0.184875l-106.141052,0c-1.789246,0 -3.449158,0.554626 -4.600281,1.553665c-1.146912,0.977707 -1.914368,2.371384 -1.914368,3.768616l0,222.380325c0,1.397247 0.638123,2.74115 1.914368,3.743683c1.151123,0.999084 2.811035,1.553711 4.600281,1.553711l192.099976,0c1.659973,0 3.319885,-0.526184 4.471008,-1.553711c1.276245,-1.002533 1.914368,-2.346436 1.914368,-3.743683l0,-147.978607c-0.383606,-17.18631 -16.603699,-35.897842 -35.509644,-51.605148zm-9.067139,7.537231c8.429016,6.776398 16.094788,14.470062 21.712769,21.875748c-4.979858,-1.582108 -10.088928,-2.766022 -14.943665,-3.715286c-10.602051,-1.976746 -20.945435,-2.769577 -27.460205,-3.082443c0.129333,-1.162582 0.129333,-2.453156 0.129333,-3.850388c0,-7.508789 -0.642334,-18.210236 -3.703613,-27.645996c-0.129333,-0.078217 -0.129333,-0.156433 -0.129333,-0.263092c7.920227,4.376572 16.733032,10.14682 24.394714,16.681458zm31.676697,186.695847l-179.199829,0l0,-211.732254l99.880737,0l0,0.028442c4.341736,-0.238205 8.049561,3.320648 10.985718,11.437393c2.55249,7.722107 3.194824,17.815598 3.194824,24.798203c0,5.112518 -0.258545,8.564713 -0.258545,8.564713l-0.508911,5.613815l6.898438,0.081772c0,0 15.836243,0.131546 31.288818,3.054001c14.947998,2.662918 26.69696,7.960312 27.71875,13.968765c0,0.526184 0,1.055923 0,1.55722l0,142.62793l0,0z" fill-opacity="null" stroke-opacity="null" stroke-width="0" stroke="#000" fill="#000000"/>
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</svg>" />
</div>
</div>
</section>
<section class="container">
<h1>Components as Tags</h1>
<div class="row">
<div class="col-sm-12">
<h2>JSX Syntax</h2>
<p>
React JSX is transpiled to Javascript. This allows for mixing html and javascript syntax.
</p>
</div>
</div>
<div class="row">
<div class="col-sm-6">
<span>JSX:</span>
<div class="sourceCode" data-source="jsxSyntaxSource"></div>
</div>
<div class="col-sm-6">
<span>Transpiled Javascript</span>
<div class="sourceCode" data-source="jsxTanslatedSyntaxSource"></div>
</div>
</div>
<div class="row">
<div class="col-sm-4">
<ul>
<li>Defining a component allows you to use a variable as a JSX tag</li>
<li>Brackets ("{}") are used to evaluate javascript within the tags.</li>
<li>The attributes of a tag are mapped to as props for the component state</li>
<li>The contents are mapped to the props.children for the component state</li>
<li>React.renderComponent mounts a given component inside a DOM element</li>
</ul>
<div class="result" id="defineRender"></div>
</div>
<div class="col-sm-8">
<div class="sourceCode" data-source="defineRenderSource" data-edit="true"></div>
</div>
</div>
</section>
<section class="container">
<h2>Properties</h2>
<div class="row">
<div class="col-sm-4">
<ul>
<li>Attributes passed in become a dictionary call "props"</li>
<li>Contents inside the tag are passed in as the "children" property</li>
<li>Define <a href="https://facebook.github.io/react/docs/reusable-components.html">propTypes</a></li>
</ul>
<div class="result" id="defineProps"></div>
</div>
<div class="col-sm-8">
<div class="sourceCode" data-source="definePropsSource" data-edit="true"></div>
</div>
</div>
</section>
<section class="container">
<h2>State & Events</h2>
<div class="row">
<div class="col-sm-4">
<ul>
<li>We can bind event handlers as properties, callbacks receive a synthetic event as the first argument</li>
<li>React.js DOM elements support most HTML5 <a href="https://facebook.github.io/react/docs/events.html">events</a> </li>
<li>Use "setState" to modify state and trigger an update</li>
<li>Use the ternary operator "condition ? trueval : falseval" to render conditionals in the DOM</li>
</ul>
<div class="result" id="defineClickHandler"></div>
</div>
<div class="col-sm-8">
<div class="sourceCode" data-source="defineClickHandlerSource" data-edit="true"></div>
</div>
</div>
</section>
<div class="footer container">
<ul class="pagination">
<li class="active"><a href="lesson1.html">Lesson 1</a></li>
<li><a href="lesson2.html">Lesson 2</a></li>
<li><a href="lesson3.html">Lesson 3</a></li>
<li><a href="lesson4.html">Lesson 4</a></li>
<li><a href="lesson2.html">»</a></li>
</ul>
</div>
</body>
</html>