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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Props · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Most components can be customized when they are created, with different parameters. These creation parameters are called `props`."/><meta name="docsearch:version" content="next"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Props · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="Most components can be customized when they are created, with different parameters. These creation parameters are called `props`."/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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href="/react-native/docs/next/statusbarios">StatusBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/stylesheet">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/systrace">Systrace</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/text-style-props">Text Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/timepickerandroid">TimePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/toastandroid">ToastAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/transforms">Transforms</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/vibration">Vibration</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/vibrationios">VibrationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/view-style-props">View Style Props</a></li></ul></div></div></section></div><script>
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</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/props.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Props</h1></header><article><div><span><p>Most components can be customized when they are created, with different parameters. These creation parameters are called <code>props</code>.</p>
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<p>For example, one basic React Native component is the <code>Image</code>. When you create an image, you can use a prop named <code>source</code> to control what image it shows.</p>
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<div class="web-player"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
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<span class="hljs-keyword">import</span> { AppRegistry, Image } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
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<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Bananas</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
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render() {
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<span class="hljs-keyword">let</span> pic = {
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<span class="hljs-attr">uri</span>: <span class="hljs-string">'https://upload.wikimedia.org/wikipedia/commons/d/de/Bananavarieties.jpg'</span>
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};
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<span class="hljs-keyword">return</span> (
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<span class="xml"><span class="hljs-tag"><<span class="hljs-name">Image</span> <span class="hljs-attr">source</span>=<span class="hljs-string">{pic}</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{width:</span> <span class="hljs-attr">193</span>, <span class="hljs-attr">height:</span> <span class="hljs-attr">110</span>}}/></span>
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);
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}
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}
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// skip this line if using Create React Native App
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AppRegistry.registerComponent('AwesomeProject', () => Bananas);
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</span></code></pre><iframe style="margin-top: 4" width="100%" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.10.0/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20Image%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20Bananas%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20let%20pic%20%3D%20%7B%0A%20%20%20%20%20%20uri%3A%20'https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fd%2Fde%2FBananavarieties.jpg'%0A%20%20%20%20%7D%3B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CImage%20source%3D%7Bpic%7D%20style%3D%7B%7Bwidth%3A%20193%2C%20height%3A%20110%7D%7D%2F%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0A%2F%2F%20skip%20this%20line%20if%20using%20Create%20React%20Native%20App%0AAppRegistry.registerComponent('AwesomeProject'%2C%20()%20%3D%3E%20Bananas)%3B%0A" frame-border="0"></iframe></div>
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<p>Notice that <code>{pic}</code> is surrounded by braces, to embed the variable <code>pic</code> into JSX. You can put any JavaScript expression inside braces in JSX.</p>
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<p>Your own components can also use <code>props</code>. This lets you make a single component that is used in many different places in your app, with slightly different properties in each place. Just refer to <code>this.props</code> in your <code>render</code> function. Here's an example:</p>
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<div class="web-player"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React, { Component } <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
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<span class="hljs-keyword">import</span> { AppRegistry, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
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<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Greeting</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
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render() {
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<span class="hljs-keyword">return</span> (
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<span class="xml"><span class="hljs-tag"><<span class="hljs-name">Text</span>></span>Hello {this.props.name}!<span class="hljs-tag"></<span class="hljs-name">Text</span>></span></span>
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);
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}
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}
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<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">LotsOfGreetings</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Component</span> </span>{
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render() {
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<span class="hljs-keyword">return</span> (
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<View style={{alignItems: 'center'}}>
|
||
<Greeting name='Rexxar' />
|
||
<Greeting name='Jaina' />
|
||
<Greeting name='Valeera' />
|
||
</View>
|
||
);
|
||
}
|
||
}
|
||
|
||
// skip this line if using Create React Native App
|
||
AppRegistry.registerComponent('AwesomeProject', () => LotsOfGreetings);
|
||
</code></pre><iframe style="margin-top: 4" width="100%" height="420" data-src="//cdn.rawgit.com/dabbott/react-native-web-player/gh-v1.10.0/index.html#code=import%20React%2C%20%7B%20Component%20%7D%20from%20'react'%3B%0Aimport%20%7B%20AppRegistry%2C%20Text%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aclass%20Greeting%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CText%3EHello%20%7Bthis.props.name%7D!%3C%2FText%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0Aexport%20default%20class%20LotsOfGreetings%20extends%20Component%20%7B%0A%20%20render()%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7B%7BalignItems%3A%20'center'%7D%7D%3E%0A%20%20%20%20%20%20%20%20%3CGreeting%20name%3D'Rexxar'%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CGreeting%20name%3D'Jaina'%20%2F%3E%0A%20%20%20%20%20%20%20%20%3CGreeting%20name%3D'Valeera'%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A%0A%2F%2F%20skip%20this%20line%20if%20using%20Create%20React%20Native%20App%0AAppRegistry.registerComponent('AwesomeProject'%2C%20()%20%3D%3E%20LotsOfGreetings)%3B%0A" frame-border="0"></iframe></div>
|
||
|
||
<p>Using <code>name</code> as a prop lets us customize the <code>Greeting</code> component, so we can reuse that component for each of our greetings. This example also uses the <code>Greeting</code> component in JSX, just like the built-in components. The power to do this is what makes React so cool - if you find yourself wishing that you had a different set of UI primitives to work with, you just invent new ones.</p>
|
||
<p>The other new thing going on here is the <a href="/react-native/docs/next/view"><code>View</code></a> component. A <a href="/react-native/docs/next/view"><code>View</code></a> is useful as a container for other components, to help control style and layout.</p>
|
||
<p>With <code>props</code> and the basic <a href="/react-native/docs/next/text"><code>Text</code></a>, <a href="/react-native/docs/next/image"><code>Image</code></a>, and <a href="/react-native/docs/next/view"><code>View</code></a> components, you can build a wide variety of static screens. To learn how to make your app change over time, you need to <a href="/react-native/docs/next/state">learn about State</a>.</p>
|
||
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/tutorial">← Learn the Basics</a><a class="docs-next button" href="/react-native/docs/next/state">State →</a></div></div></div></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/react-native/" class="nav-home"><img src="/react-native/img/header_logo.png" alt="React Native" width="66" height="58"/></a><div><h5><a href="/react-native/docs/getting-started.html">Docs</a></h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/help.html">Community</a></h5><a href="/react-native/showcase.html">Who's using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discuss.reactjs.org" target="_blank">Discussion Forum</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2018 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(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';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));
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