mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Paul O’Shannessy
175 lines
9.4 KiB
HTML
175 lines
9.4 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
|
|
<title>React | Component Basics</title>
|
|
<meta name="viewport" content="width=device-width">
|
|
<meta property="og:title" content="React | Component Basics" />
|
|
<meta property="og:type" content="website" />
|
|
<meta property="og:url" content="http://facebook.github.io/react/docs/component-basics.html" />
|
|
<meta property="og:image" content="http://facebook.github.io/react/img/logo_og.png" />
|
|
<meta property="og:description" content="A JavaScript library for building user interfaces" />
|
|
|
|
<link rel="shortcut icon" href="/react/favicon.ico">
|
|
<link rel="alternate" type="application/rss+xml" title="React" href="http://facebook.github.io/react/feed.xml">
|
|
|
|
<link rel="stylesheet" href="/react/css/react.css">
|
|
<link rel="stylesheet" href="/react/css/syntax.css">
|
|
<link rel="stylesheet" href="/react/css/codemirror.css">
|
|
|
|
<script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script>
|
|
<script type="text/javascript">try{Typekit.load();}catch(e){}</script>
|
|
|
|
<script type="text/javascript" src="/react/js/codemirror.js"></script>
|
|
<script type="text/javascript" src="/react/js/javascript.js"></script>
|
|
<script type="text/javascript" src="/react/js/react.min.js"></script>
|
|
<script type="text/javascript" src="/react/js/JSXTransformer.js"></script>
|
|
<script type="text/javascript" src="/react/js/live_editor.js"></script>
|
|
<script type="text/javascript" src="/react/js/showdown.js"></script>
|
|
</head>
|
|
<body>
|
|
|
|
<div class="container">
|
|
|
|
<div class="nav-main">
|
|
<div class="wrap">
|
|
<a class="nav-home" href="/react/index.html">
|
|
<img class="nav-logo" alt="" src="/react/img/logo_small.png" width="38" height="38">
|
|
React
|
|
</a>
|
|
<ul class="nav-site">
|
|
<li><a href="/react/docs/getting-started.html" class="active">docs</a></li>
|
|
<li><a href="/react/support.html">support</a></li>
|
|
<li><a href="/react/downloads.html">download</a></li>
|
|
<li><a href="/react/blog/">blog</a></li>
|
|
<li><a href="http://github.com/facebook/react">github</a>
|
|
</ul>
|
|
<!-- <iframe src="http://ghbtns.com/github-btn.html?user=facebook&repo=react.js&type=fork"allowtransparency="true" frameborder="0" scrolling="0" width="62" height="20"></iframe> -->
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
<section class="content wrap documentationContent">
|
|
<div class="nav-docs">
|
|
<div class="nav-docs-section">
|
|
<h3>Getting started</h3>
|
|
<ul>
|
|
<li><a href="/react/docs/getting-started.html">Getting Started</a></li>
|
|
<li><a href="/react/docs/tutorial.html">Tutorial</a></li>
|
|
<li><a href="/react/docs/common-questions.html">Common Questions</a></li>
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Reference</h3>
|
|
<ul>
|
|
<li><a href="/react/docs/syntax.html">JSX Syntax</a></li>
|
|
<li><a href="/react/docs/component-basics.html" class="active">Component Basics</a></li>
|
|
<li><a href="/react/docs/component-data.html">Component Data</a></li>
|
|
<li><a href="/react/docs/component-lifecycle.html">Component Lifecycle</a></li>
|
|
<li><a href="/react/docs/event-handling.html">Event Handling</a></li>
|
|
<li><a href="/react/docs/advanced-components.html">Advanced Components</a></li>
|
|
<li><a href="/react/docs/mixins.html">Mixins</a></li>
|
|
<li><a href="/react/docs/api.html">API</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
<div class="inner-content">
|
|
<h1>Component Basics</h1>
|
|
<div class="subHeader">What are components?</div>
|
|
<p><em>Components</em> are the basic units of composition in React. Components encapsulate
|
|
the logic necessary to take input parameters and render markup. Components can
|
|
be rendered into an existing DOM element on the page by using
|
|
<code>React.renderComponent</code>:</p>
|
|
<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="c1">// Replaces everything in `document.body` with <div>Hello, world!</div>;</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">renderComponent</span><span class="p">(</span><span class="o"><</span><span class="nx">div</span><span class="o">></span><span class="nx">Hello</span><span class="p">,</span> <span class="nx">world</span><span class="o">!<</span><span class="err">/div>, document.body);</span>
|
|
</code></pre></div>
|
|
<p>Keep in mind that <code><div></code> is <strong>not</strong> a DOM element! Keep reading...</p>
|
|
|
|
<h2>Types of Components</h2>
|
|
|
|
<p>There are two types of components:</p>
|
|
|
|
<ul>
|
|
<li><strong>Composite Components</strong></li>
|
|
<li><strong>DOM Components</strong></li>
|
|
</ul>
|
|
|
|
<h3>Composite Components <small>such as <code>TodoApp</code> and <code>Typeahead</code>.</small></h3>
|
|
|
|
<p>The majority of your React code will be implementing composite components.</p>
|
|
|
|
<p>Composite components are higher-level components with custom rendering logic
|
|
that may compose other composite components or DOM components.</p>
|
|
<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="cm">/** @jsx React.DOM */</span>
|
|
<span class="kd">var</span> <span class="nx">LinkButton</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
|
|
<span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
|
|
<span class="k">return</span> <span class="o"><</span><span class="nx">a</span> <span class="nx">className</span><span class="o">=</span><span class="s2">"btn"</span> <span class="o">/></span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
<span class="p">});</span>
|
|
|
|
<span class="kd">var</span> <span class="nx">myButton</span> <span class="o">=</span> <span class="o"><</span><span class="nx">LinkButton</span> <span class="o">/></span><span class="p">;</span>
|
|
</code></pre></div>
|
|
<p>This example defines a <code>LinkButton</code> component class using <code>React.createClass()</code>,
|
|
and its <code>render()</code> method composes the <code><a></code> DOM component.</p>
|
|
|
|
<h3>DOM Components <small>such as <code>div</code> and <code>span</code>.</small></h3>
|
|
|
|
<p>DOM components are the set of classes that correspond to browser DOM elements.
|
|
They are defined in <code>React.DOM</code> and can be brought "into scope" by setting
|
|
<code>@jsx React.DOM</code> in the docblock. See <a href="syntax.html">JSX Syntax</a> for more
|
|
details.</p>
|
|
|
|
<p>Although <code>React.DOM</code> components look like browser DOM elements, they differ in a
|
|
few ways:</p>
|
|
|
|
<ul>
|
|
<li>All property names, including event handlers, are camelCased.</li>
|
|
<li>JavaScript identifiers should be used, namely <code>className</code> and <code>htmlFor</code>.</li>
|
|
<li>The <code>style</code> prop expects an object instead of a string. The object should map
|
|
camelCased style properties to values, e.g. <code>{backgroundColor: '#fff'}</code>.</li>
|
|
</ul>
|
|
|
|
<p>Here is an example of a React link styled as a button with a click handler:</p>
|
|
<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="cm">/** @jsx React.DOM */</span>
|
|
<span class="kd">var</span> <span class="nx">handleClick</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span><span class="nx">alert</span><span class="p">(</span><span class="s1">'Clicked!'</span><span class="p">);};</span>
|
|
<span class="kd">var</span> <span class="nx">inlineStyle</span> <span class="o">=</span> <span class="p">{</span><span class="nx">textDecoration</span><span class="o">:</span> <span class="s1">'none'</span><span class="p">};</span>
|
|
|
|
<span class="kd">var</span> <span class="nx">myLink</span> <span class="o">=</span> <span class="o"><</span><span class="nx">a</span> <span class="nx">className</span><span class="o">=</span><span class="s2">"btn"</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="nx">handleClick</span><span class="p">}</span> <span class="nx">style</span><span class="o">=</span><span class="p">{</span><span class="nx">inlineStyle</span><span class="p">}</span> <span class="o">/></span><span class="p">;</span>
|
|
</code></pre></div>
|
|
|
|
<div class="docs-prevnext">
|
|
|
|
<a class="docs-prev" href="/react/docs/syntax.html">← Prev</a>
|
|
|
|
|
|
<a class="docs-next" href="/react/docs/component-data.html">Next →</a>
|
|
|
|
</div>
|
|
</div>
|
|
</section>
|
|
|
|
|
|
<footer class="wrap">
|
|
<div class="left">A Facebook & Instagram collaboration.</div>
|
|
<div class="right">© 2013 Facebook Inc.</div>
|
|
</footer>
|
|
</div>
|
|
<script>
|
|
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
|
|
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
|
|
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
|
|
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
|
|
ga('create', 'UA-41298772-1', 'facebook.github.io');
|
|
ga('send', 'pageview');
|
|
|
|
!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="https://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");
|
|
</script>
|
|
</body>
|
|
</html>
|
|
|