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<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 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`."/><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/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/blog/feed.xml" title="React Native Blog RSS Feed"/><script type="text/javascript" src="https://snack.expo.io/embed.js"></script><script type="text/javascript" src="/react-native/js/codeblocks.js"></script><link rel="stylesheet" href="/react-native/css/main.css"/></head><body class="sideNavVisible"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/react-native/"><img class="logo" src="/react-native/img/header_logo.png"/><h2 class="headerTitle">React Native</h2></a><a href="/react-native/versions.html"><h3>next</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li><a href="/react-native/docs/next/getting-started.html" target="_self">Docs</a></li><li><a href="/react-native/en/help.html" target="_self">Community</a></li><li><a href="/react-native/blog" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search"/></li><li><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li><li><a href="https://reactjs.org/" target="_self">React</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><i></i></div><h2><i></i><span>The Basics</span></h2></div><div class="navGroups"><div class="navGroup navGroupActive"><h3>The Basics</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/next/getting-started.html">Getting Started</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/tutorial.html">Learn the Basics</a></li><li class="navListItem navListItemActive"><a class="navItem navItemActive" href="/react-native/docs/next/props.html">Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/state.html">State</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/style.html">Style</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/height-and-width.html">Height and Width</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/flexbox.html">Layout with Flexbox</a></li><li class="navListItem"><a class="navItem" 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class="navItem" href="/react-native/docs/next/image.html">Image</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/inputaccessoryview.html">InputAccessoryView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/listview.html">ListView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/maskedviewios.html">MaskedViewIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/modal.html">Modal</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/navigatorios.html">NavigatorIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/picker.html">Picker</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/pickerios.html">PickerIOS</a></li><li class="navListItem"><a 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class="navItem" href="/react-native/docs/next/clipboard.html">Clipboard</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/datepickerandroid.html">DatePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/dimensions.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/easing.html">Easing</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/geolocation.html">Geolocation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/imageeditor.html">ImageEditor</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/imagepickerios.html">ImagePickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/imagestore.html">ImageStore</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/image-style-props.html">Image Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/interactionmanager.html">InteractionManager</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/keyboard.html">Keyboard</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/layout-props.html">Layout Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/layoutanimation.html">LayoutAnimation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/linking.html">Linking</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/listviewdatasource.html">ListViewDataSource</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/netinfo.html">NetInfo</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/panresponder.html">PanResponder</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/permissionsandroid.html">PermissionsAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/pixelratio.html">PixelRatio</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/pushnotificationios.html">PushNotificationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/settings.html">Settings</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/shadow-props.html">Shadow Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/share.html">Share</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/statusbarios.html">StatusBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/stylesheet.html">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/systrace.html">Systrace</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/text-style-props.html">Text Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/timepickerandroid.html">TimePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/toastandroid.html">ToastAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/transforms.html">Transforms</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/vibration.html">Vibration</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/vibrationios.html">VibrationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/next/view-style-props.html">View Style Props</a></li></ul></div></div></section></div><script>
var toggler = document.getElementById('navToggler');
var nav = document.getElementById('docsNav');
toggler.onclick = function() {
nav.classList.toggle('docsSliderActive');
};
</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">Edit</a><h1>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>
<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>
<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>;
<span class="hljs-keyword">import</span> { AppRegistry, Image } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
<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>{
render() {
<span class="hljs-keyword">let</span> pic = {
<span class="hljs-attr">uri</span>: <span class="hljs-string">'https://upload.wikimedia.org/wikipedia/commons/d/de/Bananavarieties.jpg'</span>
};
<span class="hljs-keyword">return</span> (
<span class="xml"><span class="hljs-tag">&lt;<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>}}/&gt;</span>
);
}
}
// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () =&gt; Bananas);
</span></code></pre><iframe style="margin-top: 4" width="880" 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>
<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>
<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>
<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>;
<span class="hljs-keyword">import</span> { AppRegistry, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
<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>{
render() {
<span class="hljs-keyword">return</span> (
<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">Text</span>&gt;</span>Hello {this.props.name}!<span class="hljs-tag">&lt;/<span class="hljs-name">Text</span>&gt;</span></span>
);
}
}
<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>{
render() {
<span class="hljs-keyword">return</span> (
&lt;View style={{alignItems: 'center'}}&gt;
&lt;Greeting name='Rexxar' /&gt;
&lt;Greeting name='Jaina' /&gt;
&lt;Greeting name='Valeera' /&gt;
&lt;/View&gt;
);
}
}
// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () =&gt; LotsOfGreetings);
</code></pre><iframe style="margin-top: 4" width="880" 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.html"><code>View</code></a> component. A <a href="/react-native/docs/next/view.html"><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.html"><code>Text</code></a>, <a href="/react-native/docs/next/image.html"><code>Image</code></a>, and <a href="/react-native/docs/next/view.html"><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.html">learn about State</a>.</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="tutorial.html">← Learn the Basics</a><a class="docs-next button" href="state.html">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&#x27;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>
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