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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 created parameters are called `props`, short for properties."/><meta name="docsearch:version" content="0.63"/><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://reactnative.dev/"/><meta property="og:description" content="Most components can be customized when they are created, with different parameters. These created parameters are called `props`, short for properties."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><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://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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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>
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
<span class="hljs-keyword">import</span> { Image } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
<span class="hljs-keyword">const</span> Bananas = <span class="hljs-function"><span class="hljs-params">()</span> =&gt;</span> {
<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>, <span class="hljs-attr">marginTop:50</span>}}/&gt;</span>
);
}
export default Bananas;
</span></code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
data-snack-name="Props"
data-snack-description="Example usage"
data-snack-code="import%20React%20from%20'react'%3B%0Aimport%20%7B%20Image%20%7D%20from%20'react-native'%3B%0A%0Aconst%20Bananas%20%3D%20()%20%3D%3E%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%2C%20marginTop%3A50%7D%7D%2F%3E%0A%20%20%20%20)%3B%0A%7D%0A%0Aexport%20default%20Bananas%3B%0A"
data-snack-platform="web"
data-snack-supported-platforms=ios,android,web
data-snack-preview="true"
style="
overflow: hidden;
background: #fafafa;
border: 1px solid rgba(0,0,0,.16);
border-radius: 4px;
height: 514px;
width: 100%;
"
></div></div></div><p>Notice the braces surrounding <code>{pic}</code> - these 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 by referring to <code>props</code> in your <code>render</code> function. Here's an example:</p>
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React <span class="hljs-keyword">from</span> <span class="hljs-string">'react'</span>;
<span class="hljs-keyword">import</span> { Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">'react-native'</span>;
<span class="hljs-keyword">const</span> Greeting = <span class="hljs-function">(<span class="hljs-params">props</span>) =&gt;</span> {
<span class="hljs-keyword">return</span> (
<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{alignItems:</span> '<span class="hljs-attr">center</span>'}}&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">Text</span>&gt;</span>Hello {props.name}!<span class="hljs-tag">&lt;/<span class="hljs-name">Text</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">View</span>&gt;</span></span>
);
}
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> LotsOfGreetings = <span class="hljs-function"><span class="hljs-params">()</span> =&gt;</span> {
<span class="hljs-keyword">return</span> (
&lt;View style={{alignItems: 'center', top: 50}}&gt;
&lt;Greeting name='Rexxar' /&gt;
&lt;Greeting name='Jaina' /&gt;
&lt;Greeting name='Valeera' /&gt;
&lt;/View&gt;
);
}
</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
data-snack-name="Props"
data-snack-description="Example usage"
data-snack-code="import%20React%20from%20'react'%3B%0Aimport%20%7B%20Text%2C%20View%20%7D%20from%20'react-native'%3B%0A%0Aconst%20Greeting%20%3D%20(props)%20%3D%3E%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%3CText%3EHello%20%7Bprops.name%7D!%3C%2FText%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%7D%0A%0Aexport%20default%20LotsOfGreetings%20%3D%20()%20%3D%3E%20%7B%0A%20%20%20%20return%20(%0A%20%20%20%20%20%20%3CView%20style%3D%7B%7BalignItems%3A%20'center'%2C%20top%3A%2050%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%7D%0A"
data-snack-platform="web"
data-snack-supported-platforms=ios,android,web
data-snack-preview="true"
style="
overflow: hidden;
background: #fafafa;
border: 1px solid rgba(0,0,0,.16);
border-radius: 4px;
height: 514px;
width: 100%;
"
></div></div></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, similar to the <a href="intro-react-native-components">Core Components</a>. 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 can invent new ones.</p>
<p>The other new thing going on here is the <a href="/docs/view"><code>View</code></a> component. A <a href="/docs/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="/docs/text"><code>Text</code></a>, <a href="/docs/image"><code>Image</code></a>, and <a href="/docs/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="/docs/state">learn about State</a>.</p>
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