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HTML
<!DOCTYPE html><html><head><title>FlatList</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="FlatList"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="css/react-native.css"><link rel="stylesheet" href="css/prism.css"><link rel="alternate" type="application/rss+xml" title="React Native Blog" href="https://facebook.github.io/react-native/blog/feed.xml"><link href="//cdn-images.mailchimp.com/embedcode/horizontal-slim-10_7.css" rel="stylesheet" type="text/css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><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'));</script><script>window.twttr=(function(d,s, id){var js,fjs=d.getElementsByTagName(s)[0],t=window.twttr||{};if(d.getElementById(id))return t;js=d.createElement(s);js.id=id;js.src='https://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js, fjs);t._e = [];t.ready = function(f) {t._e.push(f);};return t;}(document, 'script', 'twitter-wjs'));</script><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href=""><img src="img/header_logo.png">React Native</a><a class="nav-version" href="/react-native/versions.html">0.48</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active" data-target=".nav-docs">Docs</a></li><li><a href="/react-native/support.html" class="">Help</a></li><li><a href="/react-native/blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" tabindex="0" type="text" placeholder="Search docs..."></div><ul class="nav-site nav-site-external"><li><a href="https://github.com/facebook/react-native" class="">GitHub</a></li><li><a href="http://facebook.github.io/react" class="">React</a></li></ul></div></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-viewport"><div class="nav-docs-section"><h3>The Basics</h3><ul><li><a style="margin-left:10px;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:10px;" class="" href="docs/tutorial.html">Learn the Basics</a></li><li><a style="margin-left:10px;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:10px;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:10px;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:10px;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:10px;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:10px;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:10px;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-listview.html">Using List Views</a></li><li><a style="margin-left:10px;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:10px;" class="" href="docs/more-resources.html">More Resources</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:10px;" class="" href="docs/components-and-apis.html">Components and APIs</a></li><li><a style="margin-left:10px;" class="" href="docs/platform-specific-code.html">Platform Specific Code</a></li><li><a style="margin-left:10px;" class="" href="docs/navigation.html">Navigating Between Screens</a></li><li><a style="margin-left:10px;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:10px;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:10px;" class="" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:10px;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:10px;" class="" href="docs/debugging.html">Debugging</a></li><li><a style="margin-left:10px;" class="" href="docs/performance.html">Performance</a></li><li><a style="margin-left:10px;" class="" href="docs/gesture-responder-system.html">Gesture Responder System</a></li><li><a style="margin-left:10px;" class="" href="docs/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:10px;" class="" href="docs/direct-manipulation.html">Direct Manipulation</a></li><li><a style="margin-left:10px;" class="" href="docs/colors.html">Color Reference</a></li><li><a style="margin-left:10px;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:10px;" class="" href="docs/running-on-device.html">Running On Device</a></li><li><a style="margin-left:10px;" class="" href="docs/upgrading.html">Upgrading to new React Native versions</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-ios.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-ios.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/linking-libraries-ios.html">Linking Libraries</a></li><li><a style="margin-left:10px;" class="" href="docs/running-on-simulator-ios.html">Running On Simulator</a></li><li><a style="margin-left:10px;" class="" href="docs/communication-ios.html">Communication between native and React Native</a></li><li><a style="margin-left:10px;" class="" href="docs/building-for-apple-tv.html">Building For Apple TV</a></li><li><a style="margin-left:10px;" class="" href="docs/app-extensions.html">App Extensions</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/headless-js-android.html">Headless JS</a></li><li><a style="margin-left:10px;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:10px;" class="" href="docs/android-building-from-source.html">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>Contributing</h3><ul><li><a style="margin-left:10px;" class="" href="docs/contributing.html">How to Contribute</a></li><li><a style="margin-left:10px;" class="" href="docs/testing.html">Testing your Changes</a></li><li><a style="margin-left:10px;" class="" href="docs/maintainers.html">What to Expect from Maintainers</a></li><li><a style="margin-left:10px;" class="" href="docs/understanding-cli.html">Understanding the CLI</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:10px;" class="" href="docs/activityindicator.html">ActivityIndicator</a></li><li><a style="margin-left:10px;" class="" href="docs/button.html">Button</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerios.html">DatePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li><a style="margin-left:10px;" class="active" href="docs/flatlist.html">FlatList</a></li><li><a style="margin-left:10px;" class="" href="docs/image.html">Image</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li><a style="margin-left:10px;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:10px;" class="" href="docs/maskedviewios.html">MaskedViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:10px;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:10px;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:10px;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/sectionlist.html">SectionList</a></li><li><a style="margin-left:10px;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:10px;" class="" href="docs/snapshotviewios.html">SnapshotViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:10px;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:10px;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:10px;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:10px;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:10px;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/virtualizedlist.html">VirtualizedList</a></li><li><a style="margin-left:10px;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>APIs</h3><ul><li><a style="margin-left:10px;" class="" href="docs/accessibilityinfo.html">AccessibilityInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:10px;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:10px;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:10px;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:10px;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:10px;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/backhandler.html">BackHandler</a></li><li><a style="margin-left:10px;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:10px;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:10px;" class="" href="docs/easing.html">Easing</a></li><li><a style="margin-left:10px;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:10px;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:10px;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:10px;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:10px;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:10px;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:10px;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:10px;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:10px;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:10px;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:10px;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:10px;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:10px;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li><li><a style="margin-left:10px;" class="" href="docs/viewproptypes.html">ViewPropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/viewstyleproptypes.html">ViewStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/textstyleproptypes.html">TextStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestyleproptypes.html">ImageStylePropTypes</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="flatlist"></a>FlatList <a class="hash-link" href="docs/flatlist.html#flatlist">#</a></h1><div><div><p>A performant interface for rendering simple, flat lists, supporting the most handy features:</p><ul><li>Fully cross-platform.</li><li>Optional horizontal mode.</li><li>Configurable viewability callbacks.</li><li>Header support.</li><li>Footer support.</li><li>Separator support.</li><li>Pull to Refresh.</li><li>Scroll loading.</li><li>ScrollToIndex support.</li></ul><p>If you need section support, use <a href="docs/sectionlist.html" target="_blank"><code><SectionList></code></a>.</p><p>Minimal Example:</p><div class="prism language-javascript"><span class="token operator"><</span>FlatList
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data<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span><span class="token punctuation">{</span>key<span class="token punctuation">:</span> <span class="token string">'a'</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>key<span class="token punctuation">:</span> <span class="token string">'b'</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">}</span>
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renderItem<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">{</span>item<span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token operator"><</span>Text<span class="token operator">></span><span class="token punctuation">{</span>item<span class="token punctuation">.</span>key<span class="token punctuation">}</span><span class="token operator"><</span><span class="token operator">/</span>Text<span class="token operator">></span><span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span></div><p>More complex example demonstrating <code>PureComponent</code> usage for perf optimization and avoiding bugs.</p><ul><li>By binding the <code>onPressItem</code> handler, the props will remain <code>===</code> and <code>PureComponent</code> will
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prevent wasteful re-renders unless the actual <code>id</code>, <code>selected</code>, or <code>title</code> props change, even
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if the inner <code>SomeOtherWidget</code> has no such optimizations.</li><li>By passing <code>extraData={this.state}</code> to <code>FlatList</code> we make sure <code>FlatList</code> itself will re-render
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when the <code>state.selected</code> changes. Without setting this prop, <code>FlatList</code> would not know it
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needs to re-render any items because it is also a <code>PureComponent</code> and the prop comparison will
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not show any changes.</li><li><code>keyExtractor</code> tells the list to use the <code>id</code>s for the react keys.</li></ul><div class="prism language-javascript"><span class="token keyword">class</span> <span class="token class-name">MyListItem</span> <span class="token keyword">extends</span> <span class="token class-name">React<span class="token punctuation">.</span>PureComponent</span> <span class="token punctuation">{</span>
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_onPress <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span><span class="token function">onPressItem</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<span class="token operator"><</span>SomeOtherWidget
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<span class="token punctuation">{</span><span class="token operator">...</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">}</span>
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onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPress<span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span>
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<span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">class</span> <span class="token class-name">MyList</span> <span class="token keyword">extends</span> <span class="token class-name">React<span class="token punctuation">.</span>PureComponent</span> <span class="token punctuation">{</span>
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state <span class="token operator">=</span> <span class="token punctuation">{</span>selected<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Map</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">:</span> Map<span class="token operator"><</span>string<span class="token punctuation">,</span> boolean<span class="token operator">></span><span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
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_keyExtractor <span class="token operator">=</span> <span class="token punctuation">(</span>item<span class="token punctuation">,</span> index<span class="token punctuation">)</span> <span class="token operator">=></span> item<span class="token punctuation">.</span>id<span class="token punctuation">;</span>
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_onPressItem <span class="token operator">=</span> <span class="token punctuation">(</span>id<span class="token punctuation">:</span> string<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // updater functions are preferred for transactional updates
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</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // copy the map rather than modifying state.
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</span> <span class="token keyword">const</span> selected <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Map</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>selected<span class="token punctuation">)</span><span class="token punctuation">;</span>
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selected<span class="token punctuation">.</span><span class="token keyword">set</span><span class="token punctuation">(</span>id<span class="token punctuation">,</span> <span class="token operator">!</span>selected<span class="token punctuation">.</span><span class="token keyword">get</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true"> // toggle
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</span> <span class="token keyword">return</span> <span class="token punctuation">{</span>selected<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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_renderItem <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">{</span>item<span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>
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<span class="token operator"><</span>MyListItem
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id<span class="token operator">=</span><span class="token punctuation">{</span>item<span class="token punctuation">.</span>id<span class="token punctuation">}</span>
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onPressItem<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onPressItem<span class="token punctuation">}</span>
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selected<span class="token operator">=</span><span class="token punctuation">{</span><span class="token operator">!</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>selected<span class="token punctuation">.</span><span class="token keyword">get</span><span class="token punctuation">(</span>item<span class="token punctuation">.</span>id<span class="token punctuation">)</span><span class="token punctuation">}</span>
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|
title<span class="token operator">=</span><span class="token punctuation">{</span>item<span class="token punctuation">.</span>title<span class="token punctuation">}</span>
|
|
<span class="token operator">/</span><span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
|
<span class="token operator"><</span>FlatList
|
|
data<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>props<span class="token punctuation">.</span>data<span class="token punctuation">}</span>
|
|
extraData<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">}</span>
|
|
keyExtractor<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_keyExtractor<span class="token punctuation">}</span>
|
|
renderItem<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_renderItem<span class="token punctuation">}</span>
|
|
<span class="token operator">/</span><span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span></div><p>This is a convenience wrapper around <a href="docs/virtualizedlist.html" target="_blank"><code><VirtualizedList></code></a>,
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|
and thus inherits its props (as well as those of <code>ScrollView</code>) that aren't explicitly listed
|
|
here, along with the following caveats:</p><ul><li>Internal state is not preserved when content scrolls out of the render window. Make sure all
|
|
your data is captured in the item data or external stores like Flux, Redux, or Relay.</li><li>This is a <code>PureComponent</code> which means that it will not re-render if <code>props</code> remain shallow-
|
|
equal. Make sure that everything your <code>renderItem</code> function depends on is passed as a prop
|
|
(e.g. <code>extraData</code>) that is not <code>===</code> after updates, otherwise your UI may not update on
|
|
changes. This includes the <code>data</code> prop and parent component state.</li><li>In order to constrain memory and enable smooth scrolling, content is rendered asynchronously
|
|
offscreen. This means it's possible to scroll faster than the fill rate ands momentarily see
|
|
blank content. This is a tradeoff that can be adjusted to suit the needs of each application,
|
|
and we are working on improving it behind the scenes.</li><li>By default, the list looks for a <code>key</code> prop on each item and uses that for the React key.
|
|
Alternatively, you can provide a custom <code>keyExtractor</code> prop.</li></ul><p>Also inherets <a href="docs/scrollview.html#props" target="_blank">ScrollView Props</a>, unless it is nested in another FlatList of same orientation.</p></div><h3><a class="anchor" name="props"></a>Props <a class="hash-link" href="docs/flatlist.html#props">#</a></h3><div class="props"><div class="prop"><h4 class="propTitle"><a class="anchor" name="itemseparatorcomponent"></a>ItemSeparatorComponent?: <span class="propType"><span>?ReactClass<any></span></span> <a class="hash-link" href="docs/flatlist.html#itemseparatorcomponent">#</a></h4><div><p>Rendered in between each item, but not at the top or bottom. By default, <code>highlighted</code> and
|
|
<code>leadingItem</code> props are provided. <code>renderItem</code> provides <code>separators.highlight</code>/<code>unhighlight</code>
|
|
which will update the <code>highlighted</code> prop, but you can also add custom props with
|
|
<code>separators.updateProps</code>.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="listemptycomponent"></a>ListEmptyComponent?: <span class="propType"><span>?<span><span>ReactClass<any> | </span>React.Element<any></span></span></span> <a class="hash-link" href="docs/flatlist.html#listemptycomponent">#</a></h4><div><p>Rendered when the list is empty. Can be a React Component Class, a render function, or
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|
a rendered element.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="listfootercomponent"></a>ListFooterComponent?: <span class="propType"><span>?<span><span>ReactClass<any> | </span>React.Element<any></span></span></span> <a class="hash-link" href="docs/flatlist.html#listfootercomponent">#</a></h4><div><p>Rendered at the bottom of all the items. Can be a React Component Class, a render function, or
|
|
a rendered element.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="listheadercomponent"></a>ListHeaderComponent?: <span class="propType"><span>?<span><span>ReactClass<any> | </span>React.Element<any></span></span></span> <a class="hash-link" href="docs/flatlist.html#listheadercomponent">#</a></h4><div><p>Rendered at the top of all the items. Can be a React Component Class, a render function, or
|
|
a rendered element.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="columnwrapperstyle"></a>columnWrapperStyle?: <span class="propType">StyleObj</span> <a class="hash-link" href="docs/flatlist.html#columnwrapperstyle">#</a></h4><div><p>Optional custom style for multi-item rows generated when numColumns > 1.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="data"></a>data: <span class="propType"><span>?$ReadOnlyArray<ItemT></span></span> <a class="hash-link" href="docs/flatlist.html#data">#</a></h4><div><p>For simplicity, data is just a plain array. If you want to use something else, like an
|
|
immutable list, use the underlying <code>VirtualizedList</code> directly.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="extradata"></a>extraData?: <span class="propType">any</span> <a class="hash-link" href="docs/flatlist.html#extradata">#</a></h4><div><p>A marker property for telling the list to re-render (since it implements <code>PureComponent</code>). If
|
|
any of your <code>renderItem</code>, Header, Footer, etc. functions depend on anything outside of the
|
|
<code>data</code> prop, stick it here and treat it immutably.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="getitemlayout"></a>getItemLayout?: <span class="propType">(
|
|
data: ?Array<ItemT>,
|
|
index: number,
|
|
) => {length: number, offset: number, index: number}</span> <a class="hash-link" href="docs/flatlist.html#getitemlayout">#</a></h4><div><p><code>getItemLayout</code> is an optional optimizations that let us skip measurement of dynamic content if
|
|
you know the height of items a priori. <code>getItemLayout</code> is the most efficient, and is easy to
|
|
use if you have fixed height items, for example:</p><div class="prism language-javascript">getItemLayout<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span>data<span class="token punctuation">,</span> index<span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>
|
|
<span class="token punctuation">{</span>length<span class="token punctuation">:</span> ITEM_HEIGHT<span class="token punctuation">,</span> offset<span class="token punctuation">:</span> ITEM_HEIGHT <span class="token operator">*</span> index<span class="token punctuation">,</span> index<span class="token punctuation">}</span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">}</span></div><p>Remember to include separator length (height or width) in your offset calculation if you
|
|
specify <code>ItemSeparatorComponent</code>.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="horizontal"></a>horizontal?: <span class="propType"><span>?boolean</span></span> <a class="hash-link" href="docs/flatlist.html#horizontal">#</a></h4><div><p>If true, renders items next to each other horizontally instead of stacked vertically.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="initialnumtorender"></a>initialNumToRender: <span class="propType">number</span> <a class="hash-link" href="docs/flatlist.html#initialnumtorender">#</a></h4><div><p>How many items to render in the initial batch. This should be enough to fill the screen but not
|
|
much more. Note these items will never be unmounted as part of the windowed rendering in order
|
|
to improve perceived performance of scroll-to-top actions.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="initialscrollindex"></a>initialScrollIndex?: <span class="propType"><span>?number</span></span> <a class="hash-link" href="docs/flatlist.html#initialscrollindex">#</a></h4><div><p>Instead of starting at the top with the first item, start at <code>initialScrollIndex</code>. This
|
|
disables the "scroll to top" optimization that keeps the first <code>initialNumToRender</code> items
|
|
always rendered and immediately renders the items starting at this initial index. Requires
|
|
<code>getItemLayout</code> to be implemented.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="inverted"></a>inverted?: <span class="propType"><span>?boolean</span></span> <a class="hash-link" href="docs/flatlist.html#inverted">#</a></h4><div><p>Reverses the direction of scroll. Uses scale transforms of -1.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="keyextractor"></a>keyExtractor: <span class="propType">(item: ItemT, index: number) => string</span> <a class="hash-link" href="docs/flatlist.html#keyextractor">#</a></h4><div><p>Used to extract a unique key for a given item at the specified index. Key is used for caching
|
|
and as the react key to track item re-ordering. The default extractor checks <code>item.key</code>, then
|
|
falls back to using the index, like React does.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="legacyimplementation"></a>legacyImplementation?: <span class="propType"><span>?boolean</span></span> <a class="hash-link" href="docs/flatlist.html#legacyimplementation">#</a></h4></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="numcolumns"></a>numColumns: <span class="propType">number</span> <a class="hash-link" href="docs/flatlist.html#numcolumns">#</a></h4><div><p>Multiple columns can only be rendered with <code>horizontal={false}</code> and will zig-zag like a
|
|
<code>flexWrap</code> layout. Items should all be the same height - masonry layouts are not supported.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onendreached"></a>onEndReached?: <span class="propType"><span>?(info: {distanceFromEnd: number}) => void</span></span> <a class="hash-link" href="docs/flatlist.html#onendreached">#</a></h4><div><p>Called once when the scroll position gets within <code>onEndReachedThreshold</code> of the rendered
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|
content.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onendreachedthreshold"></a>onEndReachedThreshold?: <span class="propType"><span>?number</span></span> <a class="hash-link" href="docs/flatlist.html#onendreachedthreshold">#</a></h4><div><p>How far from the end (in units of visible length of the list) the bottom edge of the
|
|
list must be from the end of the content to trigger the <code>onEndReached</code> callback.
|
|
Thus a value of 0.5 will trigger <code>onEndReached</code> when the end of the content is
|
|
within half the visible length of the list.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onrefresh"></a>onRefresh?: <span class="propType"><span>?() => void</span></span> <a class="hash-link" href="docs/flatlist.html#onrefresh">#</a></h4><div><p>If provided, a standard RefreshControl will be added for "Pull to Refresh" functionality. Make
|
|
sure to also set the <code>refreshing</code> prop correctly.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="onviewableitemschanged"></a>onViewableItemsChanged?: <span class="propType"><span>?(info: {
|
|
viewableItems: Array<ViewToken>,
|
|
changed: Array<ViewToken>,
|
|
}) => void</span></span> <a class="hash-link" href="docs/flatlist.html#onviewableitemschanged">#</a></h4><div><p>Called when the viewability of rows changes, as defined by the <code>viewabilityConfig</code> prop.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="refreshing"></a>refreshing?: <span class="propType"><span>?boolean</span></span> <a class="hash-link" href="docs/flatlist.html#refreshing">#</a></h4><div><p>Set this true while waiting for new data from a refresh.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removeclippedsubviews"></a>removeClippedSubviews?: <span class="propType">boolean</span> <a class="hash-link" href="docs/flatlist.html#removeclippedsubviews">#</a></h4><div><p>Note: may have bugs (missing content) in some circumstances - use at your own risk.</p><p>This may improve scroll performance for large lists.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="renderitem"></a>renderItem: <span class="propType">(info: {
|
|
item: ItemT,
|
|
index: number,
|
|
separators: {
|
|
highlight: () => void,
|
|
unhighlight: () => void,
|
|
updateProps: (select: 'leading' | 'trailing', newProps: Object) => void,
|
|
},
|
|
}) => ?React.Element<any></span> <a class="hash-link" href="docs/flatlist.html#renderitem">#</a></h4><div><p>Takes an item from <code>data</code> and renders it into the list. Example usage:</p><div class="prism language-javascript"><span class="token operator"><</span>FlatList
|
|
ItemSeparatorComponent<span class="token operator">=</span><span class="token punctuation">{</span>Platform<span class="token punctuation">.</span>OS <span class="token operator">!==</span> <span class="token string">'android'</span> <span class="token operator">&&</span> <span class="token punctuation">(</span><span class="token punctuation">{</span>highlighted<span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>
|
|
<span class="token operator"><</span>View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span>style<span class="token punctuation">.</span>separator<span class="token punctuation">,</span> highlighted <span class="token operator">&&</span> <span class="token punctuation">{</span>marginLeft<span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">}</span>
|
|
data<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">[</span><span class="token punctuation">{</span>title<span class="token punctuation">:</span> <span class="token string">'Title Text'</span><span class="token punctuation">,</span> key<span class="token punctuation">:</span> <span class="token string">'item1'</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">}</span>
|
|
renderItem<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">{</span>item<span class="token punctuation">,</span> separators<span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">(</span>
|
|
<span class="token operator"><</span>TouchableHighlight
|
|
onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_onPress</span><span class="token punctuation">(</span>item<span class="token punctuation">)</span><span class="token punctuation">}</span>
|
|
onShowUnderlay<span class="token operator">=</span><span class="token punctuation">{</span>separators<span class="token punctuation">.</span>highlight<span class="token punctuation">}</span>
|
|
onHideUnderlay<span class="token operator">=</span><span class="token punctuation">{</span>separators<span class="token punctuation">.</span>unhighlight<span class="token punctuation">}</span><span class="token operator">></span>
|
|
<span class="token operator"><</span>View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>backgroundColor<span class="token punctuation">:</span> <span class="token string">'white'</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">></span>
|
|
<span class="token operator"><</span>Text<span class="token operator">></span><span class="token punctuation">{</span>item<span class="token punctuation">.</span>title<span class="token punctuation">}</span><span class="token operator"><</span><span class="token operator">/</span>Text<span class="token operator">></span>
|
|
<span class="token operator"><</span><span class="token operator">/</span>View<span class="token operator">></span>
|
|
<span class="token operator"><</span><span class="token operator">/</span>TouchableHighlight<span class="token operator">></span>
|
|
<span class="token punctuation">)</span><span class="token punctuation">}</span>
|
|
<span class="token operator">/</span><span class="token operator">></span></div><p>Provides additional metadata like <code>index</code> if you need it, as well as a more generic
|
|
<code>separators.updateProps</code> function which let's you set whatever props you want to change the
|
|
rendering of either the leading separator or trailing separator in case the more common
|
|
<code>highlight</code> and <code>unhighlight</code> (which set the <code>highlighted: boolean</code> prop) are insufficient for
|
|
your use-case.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="viewabilityconfig"></a>viewabilityConfig?: <span class="propType">ViewabilityConfig</span> <a class="hash-link" href="docs/flatlist.html#viewabilityconfig">#</a></h4><div><p>See <code>ViewabilityHelper</code> for flow type and further documentation.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="progressviewoffset"></a><span class="platform">android</span>progressViewOffset?: <span class="propType">number</span> <a class="hash-link" href="docs/flatlist.html#progressviewoffset">#</a></h4><div><p>Set this when offset is needed for the loading indicator to show correctly.</p></div></div></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/flatlist.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="scrolltoend"></a>scrollToEnd<span class="methodType">(params?: object)</span> <a class="hash-link" href="docs/flatlist.html#scrolltoend">#</a></h4><div><p>Scrolls to the end of the content. May be janky without <code>getItemLayout</code> prop.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="scrolltoindex"></a>scrollToIndex<span class="methodType">(params: object)</span> <a class="hash-link" href="docs/flatlist.html#scrolltoindex">#</a></h4><div><p>Scrolls to the item at the specified index such that it is positioned in the viewable area
|
|
such that <code>viewPosition</code> 0 places it at the top, 1 at the bottom, and 0.5 centered in the
|
|
middle. <code>viewOffset</code> is a fixed number of pixels to offset the final target position.</p><p>Note: cannot scroll to locations outside the render window without specifying the
|
|
<code>getItemLayout</code> prop.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="scrolltoitem"></a>scrollToItem<span class="methodType">(params: object)</span> <a class="hash-link" href="docs/flatlist.html#scrolltoitem">#</a></h4><div><p>Requires linear scan through data - use <code>scrollToIndex</code> instead if possible.</p><p>Note: cannot scroll to locations outside the render window without specifying the
|
|
<code>getItemLayout</code> prop.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="scrolltooffset"></a>scrollToOffset<span class="methodType">(params: object)</span> <a class="hash-link" href="docs/flatlist.html#scrolltooffset">#</a></h4><div><p>Scroll to a specific content pixel offset in the list.</p><p>Check out <a href="docs/virtualizedlist.html#scrolltooffset" target="_blank">scrollToOffset</a> of VirtualizedList</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="recordinteraction"></a>recordInteraction<span class="methodType">()</span> <a class="hash-link" href="docs/flatlist.html#recordinteraction">#</a></h4><div><p>Tells the list an interaction has occured, which should trigger viewability calculations, e.g.
|
|
if <code>waitForInteractions</code> is true and the user has not scrolled. This is typically called by
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