mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Dan Abramov
603 lines
31 KiB
HTML
603 lines
31 KiB
HTML
<!DOCTYPE html>
|
|
<!--[if IE]><![endif]-->
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
|
|
<title>Transferring Props | React</title>
|
|
<meta name="viewport" content="width=device-width">
|
|
<meta property="og:title" content="Transferring Props | React">
|
|
<meta property="og:type" content="website">
|
|
<meta property="og:url" content="https://facebook.github.io/react/docs/transferring-props.html">
|
|
<meta property="og:image" content="https://facebook.github.io/react/img/logo_og.png">
|
|
<meta property="og:description" content="A JavaScript library for building user interfaces">
|
|
<meta property="fb:app_id" content="623268441017527">
|
|
|
|
<link rel="shortcut icon" href="/react/favicon.ico">
|
|
<link rel="alternate" type="application/rss+xml" title="React" href="https://facebook.github.io/react/feed.xml">
|
|
|
|
<link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css" />
|
|
<link rel="stylesheet" href="/react/css/syntax.css">
|
|
<link rel="stylesheet" href="/react/css/codemirror.css">
|
|
<link rel="stylesheet" href="/react/css/react.css">
|
|
|
|
<script src="//use.typekit.net/vqa1hcx.js"></script>
|
|
<script>try{Typekit.load();}catch(e){}</script>
|
|
|
|
<!--[if lte IE 8]>
|
|
<script src="/react/js/html5shiv.min.js"></script>
|
|
<script src="/react/js/es5-shim.min.js"></script>
|
|
<script src="/react/js/es5-sham.min.js"></script>
|
|
<![endif]-->
|
|
<script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script>
|
|
<script src="/react/js/codemirror.js"></script>
|
|
<script src="/react/js/javascript.js"></script>
|
|
<script src="/react/js/xml.js"></script>
|
|
<script src="/react/js/jsx.js"></script>
|
|
<script src="/react/js/react.js"></script>
|
|
<script src="/react/js/react-dom.js"></script>
|
|
<script src="/react/js/babel-browser.min.js"></script>
|
|
<script src="/react/js/live_editor.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" src="/react/img/logo.svg" width="36" height="36">
|
|
React
|
|
</a>
|
|
<ul class="nav-site nav-site-internal">
|
|
<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>
|
|
<input id="algolia-doc-search" type="text" placeholder="Search docs..." />
|
|
</li>
|
|
</ul>
|
|
|
|
<ul class="nav-site nav-site-external">
|
|
<li><a href="https://github.com/facebook/react">GitHub</a></li>
|
|
<li><a href="https://facebook.github.io/react-native/">React Native</a></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
|
|
|
|
|
|
<section class="content wrap documentationContent">
|
|
<div class="nav-docs">
|
|
<!-- Docs Nav -->
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Quick Start</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/thinking-in-react.html">Thinking in React</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Community Resources</h3>
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/conferences.html">Conferences</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/videos.html">Videos</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="https://github.com/facebook/react/wiki/Complementary-Tools" class="external">Complementary Tools</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="https://github.com/facebook/react/wiki/Examples" class="external">Examples</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Guides</h3>
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/why-react.html">Why React?</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/displaying-data.html">Displaying Data</a>
|
|
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/jsx-in-depth.html">JSX in Depth</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/jsx-spread.html">JSX Spread Attributes</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/jsx-gotchas.html">JSX Gotchas</a>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/interactivity-and-dynamic-uis.html">Interactivity and Dynamic UIs</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/multiple-components.html">Multiple Components</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/reusable-components.html">Reusable Components</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/transferring-props.html" class="active">Transferring Props</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/forms.html">Forms</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/working-with-the-browser.html">Working With the Browser</a>
|
|
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/more-about-refs.html">Refs to Components</a>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/tooling-integration.html">Tooling Integration</a>
|
|
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/language-tooling.html">Language Tooling</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/package-management.html">Package Management</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/environments.html">Server-side Environments</a>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/addons.html">Add-Ons</a>
|
|
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/animation.html">Animation</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/two-way-binding-helpers.html">Two-Way Binding Helpers</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/test-utils.html">Test Utilities</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/clone-with-props.html">Cloning Elements</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/create-fragment.html">Keyed Fragments</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/update.html">Immutability Helpers</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/pure-render-mixin.html">PureRenderMixin</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/perf.html">Performance Tools</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/shallow-compare.html">Shallow Compare</a>
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/advanced-performance.html">Advanced Performance</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/context.html">Context</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Reference</h3>
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/docs/top-level-api.html">Top-Level API</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/component-api.html">Component API</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/component-specs.html">Component Specs and Lifecycle</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/tags-and-attributes.html">Supported Tags and Attributes</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/events.html">Event System</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/dom-differences.html">DOM Differences</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/special-non-dom-attributes.html">Special Non-DOM Attributes</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/reconciliation.html">Reconciliation</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/webcomponents.html">Web Components</a>
|
|
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/docs/glossary.html">React (Virtual) DOM Terminology</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
|
|
<!-- Tips Nav -->
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Tips</h3>
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/tips/introduction.html">Introduction</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/inline-styles.html">Inline Styles</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/if-else-in-JSX.html">If-Else in JSX</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/self-closing-tag.html">Self-Closing Tag</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/maximum-number-of-jsx-root-nodes.html">Maximum Number of JSX Root Nodes</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/style-props-value-px.html">Shorthand for Specifying Pixel Values in style props</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/children-props-type.html">Type of the Children props</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/controlled-input-null-value.html">Value of null for Controlled Input</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/componentWillReceiveProps-not-triggered-after-mounting.html">componentWillReceiveProps Not Triggered After Mounting</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/props-in-getInitialState-as-anti-pattern.html">Props in getInitialState Is an Anti-Pattern</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/dom-event-listeners.html">DOM Event Listeners in a Component</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/initial-ajax.html">Load Initial Data via AJAX</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/false-in-jsx.html">False in JSX</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/communicate-between-components.html">Communicate Between Components</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/expose-component-functions.html">Expose Component Functions</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/children-undefined.html">this.props.children undefined</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/use-react-with-other-libraries.html">Use React with Other Libraries</a>
|
|
</li>
|
|
|
|
<li>
|
|
<a href="/react/tips/dangerously-set-inner-html.html">Dangerously Set innerHTML</a>
|
|
</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
|
|
<!-- Contributing Nav -->
|
|
|
|
<div class="nav-docs-section">
|
|
<h3>Contributing</h3>
|
|
<ul>
|
|
|
|
<li>
|
|
<a href="/react/contributing/design-principles.html">Design Principles</a>
|
|
</li>
|
|
|
|
</ul>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
|
|
<div class="inner-content">
|
|
<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/06-transferring-props.md" target="_blank">Edit on GitHub</a>
|
|
<h1>
|
|
Transferring Props
|
|
</h1>
|
|
<div class="subHeader"></div>
|
|
|
|
<p>It's a common pattern in React to wrap a component in an abstraction. The outer component exposes a simple property to do something that might have more complex implementation details.</p>
|
|
|
|
<p>You can use <a href="/react/docs/jsx-spread.html">JSX spread attributes</a> to merge the old props with additional values:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="o"><</span><span class="nx">Component</span> <span class="p">{...</span><span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">}</span> <span class="nx">more</span><span class="o">=</span><span class="s2">"values"</span> <span class="o">/></span>
|
|
</code></pre></div>
|
|
<p>If you don't use JSX, you can use any object helper such as ES6 <code>Object.assign</code> or Underscore <code>_.extend</code>:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">React</span><span class="p">.</span><span class="nx">createElement</span><span class="p">(</span><span class="nx">Component</span><span class="p">,</span> <span class="nb">Object</span><span class="p">.</span><span class="nx">assign</span><span class="p">({},</span> <span class="k">this</span><span class="p">.</span><span class="nx">props</span><span class="p">,</span> <span class="p">{</span> <span class="nx">more</span><span class="o">:</span> <span class="s1">'values'</span> <span class="p">}));</span>
|
|
</code></pre></div>
|
|
<p>The rest of this tutorial explains best practices. It uses JSX and experimental ECMAScript syntax.</p>
|
|
<h2><a class="anchor" name="manual-transfer"></a>Manual Transfer <a class="hash-link" href="#manual-transfer">#</a></h2>
|
|
<p>Most of the time you should explicitly pass the properties down. This ensures that you only expose a subset of the inner API, one that you know will work.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">FancyCheckbox</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kd">var</span> <span class="nx">fancyClass</span> <span class="o">=</span> <span class="nx">props</span><span class="p">.</span><span class="nx">checked</span> <span class="o">?</span> <span class="s1">'FancyChecked'</span> <span class="o">:</span> <span class="s1">'FancyUnchecked'</span><span class="p">;</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">div</span> <span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">fancyClass</span><span class="p">}</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="nx">props</span><span class="p">.</span><span class="nx">onClick</span><span class="p">}</span><span class="o">></span>
|
|
<span class="p">{</span><span class="nx">props</span><span class="p">.</span><span class="nx">children</span><span class="p">}</span>
|
|
<span class="o"><</span><span class="err">/div></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">FancyCheckbox</span> <span class="nx">checked</span><span class="o">=</span><span class="p">{</span><span class="kc">true</span><span class="p">}</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="nx">console</span><span class="p">)}</span><span class="o">></span>
|
|
<span class="nx">Hello</span> <span class="nx">world</span><span class="o">!</span>
|
|
<span class="o"><</span><span class="err">/FancyCheckbox>,</span>
|
|
<span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'example'</span><span class="p">)</span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<p>But what about the <code>name</code> prop? Or the <code>title</code> prop? Or <code>onMouseOver</code>?</p>
|
|
<h2><a class="anchor" name="transferring-with-...-in-jsx"></a>Transferring with <code>...</code> in JSX <a class="hash-link" href="#transferring-with-...-in-jsx">#</a></h2>
|
|
<blockquote>
|
|
<p>NOTE:</p>
|
|
|
|
<p>The <code>...</code> syntax is part of the Object Rest Spread proposal. This proposal is on track to become a standard. See the <a href="/react/docs/transferring-props.html#rest-and-spread-properties-...">Rest and Spread Properties ...</a> section below for more details.</p>
|
|
</blockquote>
|
|
|
|
<p>Sometimes it's fragile and tedious to pass every property along. In that case you can use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment">destructuring assignment</a> with rest properties to extract a set of unknown properties.</p>
|
|
|
|
<p>List out all the properties that you would like to consume, followed by <code>...other</code>.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="p">{</span> <span class="nx">checked</span><span class="p">,</span> <span class="p">...</span><span class="nx">other</span> <span class="p">}</span> <span class="o">=</span> <span class="nx">props</span><span class="p">;</span>
|
|
</code></pre></div>
|
|
<p>This ensures that you pass down all the props EXCEPT the ones you're consuming yourself.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">FancyCheckbox</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kd">var</span> <span class="p">{</span> <span class="nx">checked</span><span class="p">,</span> <span class="p">...</span><span class="nx">other</span> <span class="p">}</span> <span class="o">=</span> <span class="nx">props</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">fancyClass</span> <span class="o">=</span> <span class="nx">checked</span> <span class="o">?</span> <span class="s1">'FancyChecked'</span> <span class="o">:</span> <span class="s1">'FancyUnchecked'</span><span class="p">;</span>
|
|
<span class="c1">// `other` contains { onClick: console.log } but not the checked property</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">div</span> <span class="p">{...</span><span class="nx">other</span><span class="p">}</span> <span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">fancyClass</span><span class="p">}</span> <span class="o">/></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
<span class="nx">ReactDOM</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">FancyCheckbox</span> <span class="nx">checked</span><span class="o">=</span><span class="p">{</span><span class="kc">true</span><span class="p">}</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="nx">console</span><span class="p">)}</span><span class="o">></span>
|
|
<span class="nx">Hello</span> <span class="nx">world</span><span class="o">!</span>
|
|
<span class="o"><</span><span class="err">/FancyCheckbox>,</span>
|
|
<span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'example'</span><span class="p">)</span>
|
|
<span class="p">);</span>
|
|
</code></pre></div>
|
|
<blockquote>
|
|
<p>NOTE:</p>
|
|
|
|
<p>In the example above, the <code>checked</code> prop is also a valid DOM attribute. If you didn't use destructuring in this way you might inadvertently pass it along.</p>
|
|
</blockquote>
|
|
|
|
<p>Always use the destructuring pattern when transferring unknown <code>other</code> props.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">FancyCheckbox</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kd">var</span> <span class="nx">fancyClass</span> <span class="o">=</span> <span class="nx">props</span><span class="p">.</span><span class="nx">checked</span> <span class="o">?</span> <span class="s1">'FancyChecked'</span> <span class="o">:</span> <span class="s1">'FancyUnchecked'</span><span class="p">;</span>
|
|
<span class="c1">// ANTI-PATTERN: `checked` would be passed down to the inner component</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">div</span> <span class="p">{...</span><span class="nx">props</span><span class="p">}</span> <span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">fancyClass</span><span class="p">}</span> <span class="o">/></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><h2><a class="anchor" name="consuming-and-transferring-the-same-prop"></a>Consuming and Transferring the Same Prop <a class="hash-link" href="#consuming-and-transferring-the-same-prop">#</a></h2>
|
|
<p>If your component wants to consume a property but also wants to pass it along, you can repass it explicitly with <code>checked={checked}</code>. This is preferable to passing the full <code>props</code> object since it's easier to refactor and lint.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">FancyCheckbox</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kd">var</span> <span class="p">{</span> <span class="nx">checked</span><span class="p">,</span> <span class="nx">title</span><span class="p">,</span> <span class="p">...</span><span class="nx">other</span> <span class="p">}</span> <span class="o">=</span> <span class="nx">props</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">fancyClass</span> <span class="o">=</span> <span class="nx">checked</span> <span class="o">?</span> <span class="s1">'FancyChecked'</span> <span class="o">:</span> <span class="s1">'FancyUnchecked'</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">fancyTitle</span> <span class="o">=</span> <span class="nx">checked</span> <span class="o">?</span> <span class="s1">'X '</span> <span class="o">+</span> <span class="nx">title</span> <span class="o">:</span> <span class="s1">'O '</span> <span class="o">+</span> <span class="nx">title</span><span class="p">;</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="o"><</span><span class="nx">label</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">input</span> <span class="p">{...</span><span class="nx">other</span><span class="p">}</span>
|
|
<span class="nx">checked</span><span class="o">=</span><span class="p">{</span><span class="nx">checked</span><span class="p">}</span>
|
|
<span class="nx">className</span><span class="o">=</span><span class="p">{</span><span class="nx">fancyClass</span><span class="p">}</span>
|
|
<span class="nx">type</span><span class="o">=</span><span class="s2">"checkbox"</span>
|
|
<span class="o">/></span>
|
|
<span class="p">{</span><span class="nx">fancyTitle</span><span class="p">}</span>
|
|
<span class="o"><</span><span class="err">/label></span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div>
|
|
<blockquote>
|
|
<p>NOTE:</p>
|
|
|
|
<p>Order matters. By putting the <code>{...other}</code> before your JSX props you ensure that the consumer of your component can't override them. In the example above we have guaranteed that the input will be of type <code>"checkbox"</code>.</p>
|
|
</blockquote>
|
|
<h2><a class="anchor" name="rest-and-spread-properties-..."></a>Rest and Spread Properties <code>...</code> <a class="hash-link" href="#rest-and-spread-properties-...">#</a></h2>
|
|
<p>Rest properties allow you to extract the remaining properties from an object into a new object. It excludes every other property listed in the destructuring pattern.</p>
|
|
|
|
<p>This is an experimental implementation of an <a href="https://github.com/sebmarkbage/ecmascript-rest-spread">ECMAScript proposal</a>.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">var</span> <span class="p">{</span> <span class="nx">x</span><span class="p">,</span> <span class="nx">y</span><span class="p">,</span> <span class="p">...</span><span class="nx">z</span> <span class="p">}</span> <span class="o">=</span> <span class="p">{</span> <span class="nx">x</span><span class="o">:</span> <span class="mi">1</span><span class="p">,</span> <span class="nx">y</span><span class="o">:</span> <span class="mi">2</span><span class="p">,</span> <span class="nx">a</span><span class="o">:</span> <span class="mi">3</span><span class="p">,</span> <span class="nx">b</span><span class="o">:</span> <span class="mi">4</span> <span class="p">};</span>
|
|
<span class="nx">x</span><span class="p">;</span> <span class="c1">// 1</span>
|
|
<span class="nx">y</span><span class="p">;</span> <span class="c1">// 2</span>
|
|
<span class="nx">z</span><span class="p">;</span> <span class="c1">// { a: 3, b: 4 }</span>
|
|
</code></pre></div>
|
|
<blockquote>
|
|
<p>Note:</p>
|
|
|
|
<p>To transform rest and spread properties using Babel 6, you need to install the <a href="https://babeljs.io/docs/plugins/preset-es2015/"><code>es2015</code></a> preset, the <a href="https://babeljs.io/docs/plugins/transform-object-rest-spread/"><code>transform-object-rest-spread</code></a> plugin and configure them in the <code>.babelrc</code> file.</p>
|
|
</blockquote>
|
|
<h2><a class="anchor" name="transferring-with-underscore"></a>Transferring with Underscore <a class="hash-link" href="#transferring-with-underscore">#</a></h2>
|
|
<p>If you don't use JSX, you can use a library to achieve the same pattern. Underscore supports <code>_.omit</code> to filter out properties and <code>_.extend</code> to copy properties onto a new object.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kd">function</span> <span class="nx">FancyCheckbox</span><span class="p">(</span><span class="nx">props</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="kd">var</span> <span class="nx">checked</span> <span class="o">=</span> <span class="nx">props</span><span class="p">.</span><span class="nx">checked</span><span class="p">;</span>
|
|
<span class="kd">var</span> <span class="nx">other</span> <span class="o">=</span> <span class="nx">_</span><span class="p">.</span><span class="nx">omit</span><span class="p">(</span><span class="nx">props</span><span class="p">,</span> <span class="s1">'checked'</span><span class="p">);</span>
|
|
<span class="kd">var</span> <span class="nx">fancyClass</span> <span class="o">=</span> <span class="nx">checked</span> <span class="o">?</span> <span class="s1">'FancyChecked'</span> <span class="o">:</span> <span class="s1">'FancyUnchecked'</span><span class="p">;</span>
|
|
<span class="k">return</span> <span class="p">(</span>
|
|
<span class="nx">React</span><span class="p">.</span><span class="nx">DOM</span><span class="p">.</span><span class="nx">div</span><span class="p">(</span><span class="nx">_</span><span class="p">.</span><span class="nx">extend</span><span class="p">({},</span> <span class="nx">other</span><span class="p">,</span> <span class="p">{</span> <span class="nx">className</span><span class="o">:</span> <span class="nx">fancyClass</span> <span class="p">}))</span>
|
|
<span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div>
|
|
|
|
<div class="docs-prevnext">
|
|
|
|
<a class="docs-prev" href="/react/docs/reusable-components.html">← Prev</a>
|
|
|
|
|
|
<a class="docs-next" href="/react/docs/forms.html">Next →</a>
|
|
|
|
</div>
|
|
</div>
|
|
</section>
|
|
|
|
|
|
<footer class="wrap">
|
|
<div class="left">
|
|
A Facebook & Instagram collaboration.<br>
|
|
<a href="/react/acknowledgements.html">Acknowledgements</a>
|
|
</div>
|
|
<div class="right">
|
|
© 2013–2016 Facebook Inc.<br>
|
|
Documentation licensed under <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>.
|
|
</div>
|
|
</footer>
|
|
</div>
|
|
<div id="fb-root"></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");
|
|
|
|
(function(d, s, id) {
|
|
var js, fjs = d.getElementsByTagName(s)[0];
|
|
if (d.getElementById(id)) return;
|
|
js = d.createElement(s); js.id = id;
|
|
js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.6&appId=623268441017527";
|
|
fjs.parentNode.insertBefore(js, fjs);
|
|
}(document, 'script', 'facebook-jssdk'));
|
|
|
|
docsearch({
|
|
apiKey: '36221914cce388c46d0420343e0bb32e',
|
|
indexName: 'react',
|
|
inputSelector: '#algolia-doc-search'
|
|
});
|
|
</script>
|
|
</body>
|
|
</html>
|