mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Website Deployment Script
238 lines
71 KiB
HTML
238 lines
71 KiB
HTML
<!DOCTYPE html><html><head><title>AsyncStorage</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="AsyncStorage"><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="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">0.43</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/showcase.html" class="">Showcase</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">Tutorial</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/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-listview.html">Using a ListView</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/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:10px;" class="" href="docs/colors.html">Colors</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/handling-touches.html">Handling Touches</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/direct-manipulation.html">Direct Manipulation</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/testing.html">Testing</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/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:10px;" class="" href="docs/navigation.html">Navigation</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/understanding-cli.html">Understanding the CLI</a></li><li><a style="margin-left:10px;" class="" href="docs/upgrading.html">Upgrading</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/gesture-responder-system.html">Gesture Responder System</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></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-ui-performance.html">Profiling Android UI Performance</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>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="" 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/mapview.html">MapView</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/navigator.html">Navigator</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/adsupportios.html">AdSupportIOS</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="active" 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/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/nativemethodsmixin.html">NativeMethodsMixin</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></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="asyncstorage"></a>AsyncStorage <a class="hash-link" href="docs/asyncstorage.html#asyncstorage">#</a></h1><div><div><p><code>AsyncStorage</code> is a simple, unencrypted, asynchronous, persistent, key-value storage
|
||
system that is global to the app. It should be used instead of LocalStorage.</p><p>It is recommended that you use an abstraction on top of <code>AsyncStorage</code>
|
||
instead of <code>AsyncStorage</code> directly for anything more than light usage since
|
||
it operates globally.</p><p>On iOS, <code>AsyncStorage</code> is backed by native code that stores small values in a
|
||
serialized dictionary and larger values in separate files. On Android,
|
||
<code>AsyncStorage</code> will use either <a href="http://rocksdb.org/" target="_blank">RocksDB</a> or SQLite
|
||
based on what is available.</p><p>The <code>AsyncStorage</code> JavaScript code is a simple facade that provides a clear
|
||
JavaScript API, real <code>Error</code> objects, and simple non-multi functions. Each
|
||
method in the API returns a <code>Promise</code> object.</p><p>Persisting data:</p><div class="prism language-javascript"><span class="token keyword">try</span> <span class="token punctuation">{</span>
|
||
await AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem<span class="token punctuation">(</span></span><span class="token string">'@MySuperStore:key'</span><span class="token punctuation">,</span> <span class="token string">'I like to save it.'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // Error saving data
|
||
</span><span class="token punctuation">}</span></div><p>Fetching data:</p><div class="prism language-javascript"><span class="token keyword">try</span> <span class="token punctuation">{</span>
|
||
const value <span class="token operator">=</span> await AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem<span class="token punctuation">(</span></span><span class="token string">'@MySuperStore:key'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">if</span> <span class="token punctuation">(</span>value <span class="token operator">!</span><span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // We have data!!
|
||
</span> console<span class="token punctuation">.</span><span class="token function">log<span class="token punctuation">(</span></span>value<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // Error retrieving data
|
||
</span><span class="token punctuation">}</span></div></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/asyncstorage.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="getitem"></a><span class="methodType">static </span>getItem<span class="methodType">(key: string, callback?: ?(error: ?Error, result: ?string) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#getitem">#</a></h4><div><p>Fetches an item for a <code>key</code> and invokes a callback upon completion.
|
||
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to fetch.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error, result: ?string) => void</span></div></td><td class="description"><div><p>Function that will be called with a result if found or
|
||
any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="setitem"></a><span class="methodType">static </span>setItem<span class="methodType">(key: string, value: string, callback?: ?(error: ?Error) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#setitem">#</a></h4><div><p>Sets the value for a <code>key</code> and invokes a callback upon completion.
|
||
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to set.</p></div></td></tr><tr><td>value<br><br><div><span>string</span></div></td><td class="description"><div><p>Value to set for the <code>key</code>.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error) => void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="removeitem"></a><span class="methodType">static </span>removeItem<span class="methodType">(key: string, callback?: ?(error: ?Error) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#removeitem">#</a></h4><div><p>Removes an item for a <code>key</code> and invokes a callback upon completion.
|
||
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to remove.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error) => void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="mergeitem"></a><span class="methodType">static </span>mergeItem<span class="methodType">(key: string, value: string, callback?: ?(error: ?Error) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#mergeitem">#</a></h4><div><p>Merges an existing <code>key</code> value with an input value, assuming both values
|
||
are stringified JSON. Returns a <code>Promise</code> object.</p><p><strong>NOTE:</strong> This is not supported by all native implementations.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>key<br><br><div><span>string</span></div></td><td class="description"><div><p>Key of the item to modify.</p></div></td></tr><tr><td>value<br><br><div><span>string</span></div></td><td class="description"><div><p>New value to merge for the <code>key</code>.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(error: ?Error) => void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript">
|
||
<span class="token keyword">let</span> UID123_object <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
name<span class="token punctuation">:</span> <span class="token string">'Chris'</span><span class="token punctuation">,</span>
|
||
age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
|
||
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">'brown'</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">'brown'</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span><span class="token comment" spellcheck="true">
|
||
// You only need to define what will be added or updated
|
||
</span><span class="token keyword">let</span> UID123_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
|
||
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">'blue'</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem<span class="token punctuation">(</span></span><span class="token string">'UID123'</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID123_object<span class="token punctuation">)</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>
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">mergeItem<span class="token punctuation">(</span></span><span class="token string">'UID123'</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID123_delta<span class="token punctuation">)</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>
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem<span class="token punctuation">(</span></span><span class="token string">'UID123'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> result<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
console<span class="token punctuation">.</span><span class="token function">log<span class="token punctuation">(</span></span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token comment" spellcheck="true">
|
||
// Console log result:
|
||
</span><span class="token comment" spellcheck="true">// => {'name':'Chris','age':31,'traits':
|
||
</span><span class="token comment" spellcheck="true">// {'shoe_size':10,'hair':'brown','eyes':'blue'}}</span></div></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="clear"></a><span class="methodType">static </span>clear<span class="methodType">(callback?: ?(error: ?Error) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#clear">#</a></h4><div><p>Erases <em>all</em> <code>AsyncStorage</code> for all clients, libraries, etc. You probably
|
||
don't want to call this; use <code>removeItem</code> or <code>multiRemove</code> to clear only
|
||
your app's keys. Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>[callback]<br><br><div><span>?(error: ?Error) => void</span></div></td><td class="description"><div><p>Function that will be called with any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="getallkeys"></a><span class="methodType">static </span>getAllKeys<span class="methodType">(callback?: ?(error: ?Error, keys: ?Array<string>) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#getallkeys">#</a></h4><div><p>Gets <em>all</em> keys known to your app; for all callers, libraries, etc.
|
||
Returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>[callback]<br><br><div><span>?(error: ?Error, keys: ?Array<string>) => void</span></div></td><td class="description"><div><p>Function that will be called the keys found and any error.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="flushgetrequests"></a><span class="methodType">static </span>flushGetRequests<span class="methodType">()</span> <a class="hash-link" href="docs/asyncstorage.html#flushgetrequests">#</a></h4><div><p>Flushes any pending requests using a single batch call to get the data.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multiget"></a><span class="methodType">static </span>multiGet<span class="methodType">(keys: Array<string>, callback?: ?(errors: ?Array<Error>, result: ?Array<Array<string>>) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#multiget">#</a></h4><div><p>This allows you to batch the fetching of items given an array of <code>key</code>
|
||
inputs. Your callback will be invoked with an array of corresponding
|
||
key-value pairs found:</p><div class="prism language-javascript"><span class="token function">multiGet<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token string">'k1'</span><span class="token punctuation">,</span> <span class="token string">'k2'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> cb<span class="token punctuation">)</span> <span class="token operator">-</span><span class="token operator">></span> <span class="token function">cb<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">'k1'</span><span class="token punctuation">,</span> <span class="token string">'val1'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">'k2'</span><span class="token punctuation">,</span> <span class="token string">'val2'</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">)</span></div><p>The method returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keys<br><br><div><span>Array<string></span></div></td><td class="description"><div><p>Array of key for the items to get.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array<Error>, result: ?Array<Array<string>>) => void</span></div></td><td class="description"><div><p>Function that will be called with a key-value array of
|
||
the results, plus an array of any key-specific errors found.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript">AsyncStorage<span class="token punctuation">.</span><span class="token function">getAllKeys<span class="token punctuation">(</span></span><span class="token punctuation">(</span>err<span class="token punctuation">,</span> keys<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiGet<span class="token punctuation">(</span></span>keys<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> stores<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
stores<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // get at each store's key/value so you can work with it
|
||
</span> <span class="token keyword">let</span> key <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">let</span> value <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multiset"></a><span class="methodType">static </span>multiSet<span class="methodType">(keyValuePairs: Array<Array<string>>, callback?: ?(errors: ?Array<Error>) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#multiset">#</a></h4><div><p>Use this as a batch operation for storing multiple key-value pairs. When
|
||
the operation completes you'll get a single callback with any errors:</p><div class="prism language-javascript"><span class="token function">multiSet<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">'k1'</span><span class="token punctuation">,</span> <span class="token string">'val1'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">'k2'</span><span class="token punctuation">,</span> <span class="token string">'val2'</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">,</span> cb<span class="token punctuation">)</span><span class="token punctuation">;</span></div><p>The method returns a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keyValuePairs<br><br><div><span>Array<Array<string>></span></div></td><td class="description"><div><p>Array of key-value array for the items to set.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array<Error>) => void</span></div></td><td class="description"><div><p>Function that will be called with an array of any
|
||
key-specific errors found.</p></div></td></tr></tbody></table></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multiremove"></a><span class="methodType">static </span>multiRemove<span class="methodType">(keys: Array<string>, callback?: ?(errors: ?Array<Error>) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#multiremove">#</a></h4><div><p>Call this to batch the deletion of all keys in the <code>keys</code> array. Returns
|
||
a <code>Promise</code> object.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keys<br><br><div><span>Array<string></span></div></td><td class="description"><div><p>Array of key for the items to delete.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array<Error>) => void</span></div></td><td class="description"><div><p>Function that will be called an array of any key-specific
|
||
errors found.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript">
|
||
<span class="token keyword">let</span> keys <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'k1'</span><span class="token punctuation">,</span> <span class="token string">'k2'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiRemove<span class="token punctuation">(</span></span>keys<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
<span class="token comment" spellcheck="true"> // keys k1 & k2 removed, if they existed
|
||
</span> <span class="token comment" spellcheck="true"> // do most stuff after removal (if you want)
|
||
</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="multimerge"></a><span class="methodType">static </span>multiMerge<span class="methodType">(keyValuePairs: Array<Array<string>>, callback?: ?(errors: ?Array<Error>) => void)</span> <a class="hash-link" href="docs/asyncstorage.html#multimerge">#</a></h4><div><p>Batch operation to merge in existing and new values for a given set of
|
||
keys. This assumes that the values are stringified JSON. Returns a
|
||
<code>Promise</code> object.</p><p><strong>NOTE</strong>: This is not supported by all native implementations.</p></div><div><strong>Parameters:</strong><table class="params"><thead><tr><th>Name and Type</th><th>Description</th></tr></thead><tbody><tr><td>keyValuePairs<br><br><div><span>Array<Array<string>></span></div></td><td class="description"><div><p>Array of key-value array for the items to merge.</p></div></td></tr><tr><td>[callback]<br><br><div><span>?(errors: ?Array<Error>) => void</span></div></td><td class="description"><div><p>Function that will be called with an array of any
|
||
key-specific errors found.</p></div></td></tr></tbody></table></div><div><br>Example:<div class="prism language-javascript"><span class="token comment" spellcheck="true">
|
||
// first user, initial values
|
||
</span><span class="token keyword">let</span> UID234_object <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
name<span class="token punctuation">:</span> <span class="token string">'Chris'</span><span class="token punctuation">,</span>
|
||
age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
|
||
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">'brown'</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">'brown'</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
<span class="token comment" spellcheck="true">
|
||
// first user, delta values
|
||
</span><span class="token keyword">let</span> UID234_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
|
||
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">'blue'</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
<span class="token comment" spellcheck="true">
|
||
// second user, initial values
|
||
</span><span class="token keyword">let</span> UID345_object <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
name<span class="token punctuation">:</span> <span class="token string">'Marge'</span><span class="token punctuation">,</span>
|
||
age<span class="token punctuation">:</span> <span class="token number">25</span><span class="token punctuation">,</span>
|
||
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>hair<span class="token punctuation">:</span> <span class="token string">'blonde'</span><span class="token punctuation">,</span> eyes<span class="token punctuation">:</span> <span class="token string">'blue'</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
<span class="token comment" spellcheck="true">
|
||
// second user, delta values
|
||
</span><span class="token keyword">let</span> UID345_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
age<span class="token punctuation">:</span> <span class="token number">26</span><span class="token punctuation">,</span>
|
||
traits<span class="token punctuation">:</span> <span class="token punctuation">{</span>eyes<span class="token punctuation">:</span> <span class="token string">'green'</span><span class="token punctuation">,</span> shoe_size<span class="token punctuation">:</span> <span class="token number">6</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
|
||
<span class="token keyword">let</span> multi_set_pairs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">'UID234'</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID234_object<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">'UID345'</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID345_object<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
|
||
<span class="token keyword">let</span> multi_merge_pairs <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token string">'UID234'</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID234_delta<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token string">'UID345'</span><span class="token punctuation">,</span> JSON<span class="token punctuation">.</span><span class="token function">stringify<span class="token punctuation">(</span></span>UID345_delta<span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">]</span>
|
||
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiSet<span class="token punctuation">(</span></span>multi_set_pairs<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiMerge<span class="token punctuation">(</span></span>multi_merge_pairs<span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
AsyncStorage<span class="token punctuation">.</span><span class="token function">multiGet<span class="token punctuation">(</span></span><span class="token punctuation">[</span><span class="token string">'UID234'</span><span class="token punctuation">,</span><span class="token string">'UID345'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span>err<span class="token punctuation">,</span> stores<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
stores<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span> <span class="token punctuation">(</span>result<span class="token punctuation">,</span> i<span class="token punctuation">,</span> store<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">let</span> key <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">let</span> val <span class="token operator">=</span> store<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
|
||
console<span class="token punctuation">.</span><span class="token function">log<span class="token punctuation">(</span></span>key<span class="token punctuation">,</span> val<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token comment" spellcheck="true">
|
||
// Console log results:
|
||
</span><span class="token comment" spellcheck="true">// => UID234 {"name":"Chris","age":31,"traits":{"shoe_size":10,"hair":"brown","eyes":"blue"}}
|
||
</span><span class="token comment" spellcheck="true">// => UID345 {"name":"Marge","age":26,"traits":{"shoe_size":6,"hair":"blonde","eyes":"green"}}</span></div></div></div></div></span></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Storage/AsyncStorage.js">edit the content above on GitHub</a> and send us a pull request!</p><div><div><table width="100%"><tbody><tr><td><h3><a class="anchor" name="examples"></a>Examples <a class="hash-link" href="docs/asyncstorage.html#examples">#</a></h3></td><td style="text-align:right;"><a target="_blank" href="https://github.com/facebook/react-native/blob/master/Examples/UIExplorer/js/AsyncStorageExample.js">Edit on GitHub</a></td></tr></tbody></table><div class="example-container"><div class="prism language-javascript"><span class="token string">'use strict'</span><span class="token punctuation">;</span>
|
||
|
||
<span class="token keyword">var</span> React <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">'react'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">var</span> ReactNative <span class="token operator">=</span> <span class="token function">require<span class="token punctuation">(</span></span><span class="token string">'react-native'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">var</span> <span class="token punctuation">{</span>
|
||
AsyncStorage<span class="token punctuation">,</span>
|
||
PickerIOS<span class="token punctuation">,</span>
|
||
Text<span class="token punctuation">,</span>
|
||
View
|
||
<span class="token punctuation">}</span> <span class="token operator">=</span> ReactNative<span class="token punctuation">;</span>
|
||
<span class="token keyword">var</span> PickerItemIOS <span class="token operator">=</span> PickerIOS<span class="token punctuation">.</span>Item<span class="token punctuation">;</span>
|
||
|
||
<span class="token keyword">var</span> STORAGE_KEY <span class="token operator">=</span> <span class="token string">'@AsyncStorageExample:key'</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">var</span> COLORS <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'red'</span><span class="token punctuation">,</span> <span class="token string">'orange'</span><span class="token punctuation">,</span> <span class="token string">'yellow'</span><span class="token punctuation">,</span> <span class="token string">'green'</span><span class="token punctuation">,</span> <span class="token string">'blue'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
|
||
|
||
class <span class="token class-name">BasicStorageExample</span> extends <span class="token class-name">React<span class="token punctuation">.</span>Component</span> <span class="token punctuation">{</span>
|
||
state <span class="token operator">=</span> <span class="token punctuation">{</span>
|
||
selectedValue<span class="token punctuation">:</span> COLORS<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
||
messages<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
|
||
<span class="token function">componentDidMount<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_loadInitialState<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">done<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
|
||
_loadInitialState <span class="token operator">=</span> async <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 keyword">try</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">var</span> value <span class="token operator">=</span> await AsyncStorage<span class="token punctuation">.</span><span class="token function">getItem<span class="token punctuation">(</span></span>STORAGE_KEY<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">if</span> <span class="token punctuation">(</span>value <span class="token operator">!</span><span class="token operator">==</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>selectedValue<span class="token punctuation">:</span> value<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'Recovered selection from disk: '</span> <span class="token operator">+</span> value<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'Initialized with no selection on disk.'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'AsyncStorage error: '</span> <span class="token operator">+</span> error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
|
||
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">var</span> color <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>selectedValue<span class="token punctuation">;</span>
|
||
<span class="token keyword">return</span> <span class="token punctuation">(</span>
|
||
<View<span class="token operator">></span>
|
||
<PickerIOS
|
||
selectedValue<span class="token operator">=</span><span class="token punctuation">{</span>color<span class="token punctuation">}</span>
|
||
onValueChange<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_onValueChange<span class="token punctuation">}</span><span class="token operator">></span>
|
||
<span class="token punctuation">{</span>COLORS<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>value<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">(</span>
|
||
<PickerItemIOS
|
||
key<span class="token operator">=</span><span class="token punctuation">{</span>value<span class="token punctuation">}</span>
|
||
value<span class="token operator">=</span><span class="token punctuation">{</span>value<span class="token punctuation">}</span>
|
||
label<span class="token operator">=</span><span class="token punctuation">{</span>value<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 operator">/</span>PickerIOS<span class="token operator">></span>
|
||
<Text<span class="token operator">></span>
|
||
<span class="token punctuation">{</span><span class="token string">'Selected: '</span><span class="token punctuation">}</span>
|
||
<Text style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>color<span class="token punctuation">}</span><span class="token punctuation">}</span><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>selectedValue<span class="token punctuation">}</span>
|
||
<<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<Text<span class="token operator">></span><span class="token punctuation">{</span><span class="token string">' '</span><span class="token punctuation">}</span><<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<Text onPress<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>_removeStorage<span class="token punctuation">}</span><span class="token operator">></span>
|
||
Press here to remove from storage<span class="token punctuation">.</span>
|
||
<<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<Text<span class="token operator">></span><span class="token punctuation">{</span><span class="token string">' '</span><span class="token punctuation">}</span><<span class="token operator">/</span>Text<span class="token operator">></span>
|
||
<Text<span class="token operator">></span>Messages<span class="token punctuation">:</span><<span class="token operator">/</span>Text<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>messages<span class="token punctuation">.</span><span class="token function">map<span class="token punctuation">(</span></span><span class="token punctuation">(</span>m<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <Text key<span class="token operator">=</span><span class="token punctuation">{</span>m<span class="token punctuation">}</span><span class="token operator">></span><span class="token punctuation">{</span>m<span class="token punctuation">}</span><<span class="token operator">/</span>Text<span class="token operator">></span><span class="token punctuation">)</span><span class="token punctuation">}</span>
|
||
<<span class="token operator">/</span>View<span class="token operator">></span>
|
||
<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
|
||
_onValueChange <span class="token operator">=</span> async <span class="token punctuation">(</span>selectedValue<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>selectedValue<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">try</span> <span class="token punctuation">{</span>
|
||
await AsyncStorage<span class="token punctuation">.</span><span class="token function">setItem<span class="token punctuation">(</span></span>STORAGE_KEY<span class="token punctuation">,</span> selectedValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'Saved selection to disk: '</span> <span class="token operator">+</span> selectedValue<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'AsyncStorage error: '</span> <span class="token operator">+</span> error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
|
||
_removeStorage <span class="token operator">=</span> async <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 keyword">try</span> <span class="token punctuation">{</span>
|
||
await AsyncStorage<span class="token punctuation">.</span><span class="token function">removeItem<span class="token punctuation">(</span></span>STORAGE_KEY<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'Selection removed from disk.'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">_appendMessage<span class="token punctuation">(</span></span><span class="token string">'AsyncStorage error: '</span> <span class="token operator">+</span> error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
|
||
_appendMessage <span class="token operator">=</span> <span class="token punctuation">(</span>message<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState<span class="token punctuation">(</span></span><span class="token punctuation">{</span>messages<span class="token punctuation">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>messages<span class="token punctuation">.</span><span class="token function">concat<span class="token punctuation">(</span></span>message<span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span><span class="token punctuation">;</span>
|
||
<span class="token punctuation">}</span>
|
||
|
||
exports<span class="token punctuation">.</span>title <span class="token operator">=</span> <span class="token string">'AsyncStorage'</span><span class="token punctuation">;</span>
|
||
exports<span class="token punctuation">.</span>description <span class="token operator">=</span> <span class="token string">'Asynchronous local disk storage.'</span><span class="token punctuation">;</span>
|
||
exports<span class="token punctuation">.</span>examples <span class="token operator">=</span> <span class="token punctuation">[</span>
|
||
<span class="token punctuation">{</span>
|
||
title<span class="token punctuation">:</span> <span class="token string">'Basics - getItem, setItem, removeItem'</span><span class="token punctuation">,</span>
|
||
<span class="token function">render<span class="token punctuation">(</span></span><span class="token punctuation">)</span><span class="token punctuation">:</span> React<span class="token punctuation">.</span>Element<any<span class="token operator">></span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <BasicStorageExample <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>
|
||
<span class="token punctuation">]</span><span class="token punctuation">;</span></div><div class="embedded-simulator"><p><a class="modal-button-open"><strong>Run this example</strong></a></p><div class="modal-button-open modal-button-open-img"><img alt="Run example in simulator" width="170" height="356" src="img/uiexplorer_main_ios.png"></div><div><div class="modal"><div class="modal-content"><button class="modal-button-close">×</button><div class="center"><iframe class="simulator" src="https://appetize.io/embed/7vdfm9h3e6vuf4gfdm7r5rgc48?device=iphone6s&scale=60&autoplay=false&orientation=portrait&deviceColor=white&params=%7B%22route%22%3A%22AsyncStorage%22%7D" width="256" height="550" scrolling="no"></iframe><p>Powered by <a target="_blank" href="https://appetize.io">appetize.io</a></p></div></div></div><div class="modal-backdrop"></div></div></div></div></div></div><div class="docs-prevnext"><a class="docs-prev" href="docs/appstate.html#content">← Prev</a><a class="docs-next" href="docs/backandroid.html#content">Next →</a></div></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Tutorial</a><a href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Showcase</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Upcoming Events</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://react-native.canny.io/feature-requests" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://facebook.github.io/react/" target="_blank">React</a></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"></a><section class="copyright">Copyright © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><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-41298772-2', '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");
|
||
|
||
docsearch({
|
||
apiKey: '2c98749b4a1e588efec53b2acec13025',
|
||
indexName: 'react-native-versions',
|
||
inputSelector: '#algolia-doc-search',
|
||
algoliaOptions: { facetFilters: [ "tags:0.43" ], hitsPerPage: 5 }
|
||
});
|
||
</script><script src="js/scripts.js"></script><script type="text/javascript" src="//s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js"></script><script type="text/javascript">(function($) {window.fnames = new Array(); window.ftypes = new Array();fnames[0]='EMAIL';ftypes[0]='email';fnames[1]='FNAME';ftypes[1]='text';fnames[2]='LNAME';ftypes[2]='text';}(jQuery));var $mcj = jQuery.noConflict(true);</script></body></html> |