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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>AsyncStorage – React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="AsyncStorage – React Native | A framework for building native apps using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png?2"><meta property="og:description" content="A framework for building native apps using React"><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"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><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">0.28</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="support.html" class="">Support</a></li><li><a href="showcase.html" class="">Showcase</a></li><li><a href="blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" 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>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="docs/getting-started.html">Getting Started</a></li></ul></div><div class="nav-docs-section"><h3>Tutorials</h3><ul><li><a style="margin-left:0;" class="" href="docs/tutorial-core-components.html">Core Components</a></li></ul></div><div class="nav-docs-section"><h3>Sample Applications</h3><ul><li><a style="margin-left:0;" class="" href="docs/sample-application-movies.html">Movie Fetcher</a></li><li><a target="_blank" style="margin-left:0;" class="" href="http://makeitopen.com/">F8 2016 App</a></li></ul></div><div class="nav-docs-section"><h3>Community Resources</h3><ul><li><a style="margin-left:0;" class="" href="docs/videos.html">Videos</a></li><li><a target="_blank" style="margin-left:0;" class="" href="http://reactnative.cc/">Newsletter</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" 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href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:0;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:0;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:0;" class="active" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:0;" class="" href="docs/intentandroid.html">IntentAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:0;" class="" href="docs/nativemethodsmixin.html">NativeMethodsMixin</a></li><li><a style="margin-left:0;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:0;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:0;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/vibration.html">Vibration</a></li></ul></div><div class="nav-docs-section"><h3>Polyfills</h3><ul><li><a style="margin-left:0;" class="" href="docs/flexbox.html">Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/shadowproptypesios.html">ShadowPropTypesIOS</a></li><li><a style="margin-left:0;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:0;" class="" href="docs/network.html">Network</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html">Colors</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><table width="100%"><tbody><tr><td><h1><a class="anchor" name="asyncstorage"></a>AsyncStorage <a class="hash-link" href="docs/asyncstorage.html#asyncstorage">#</a></h1></td><td style="text-align:right;"><a target="_blank" href="https://github.com/facebook/react-native/blob/0.28-stable/Libraries/Storage/AsyncStorage.js">Edit on GitHub</a></td></tr></tbody></table><div><div><p>AsyncStorage is a simple, asynchronous, persistent, key-value storage
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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 AsyncStorage instead
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of AsyncStorage directly for anything more than light usage since it
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operates globally.</p><p>On iOS, AsyncStorage is backed by native code that stores small values in a serialized
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dictionary and larger values in separate files. On Android, AsyncStorage will use either
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RocksDB or SQLite based on what is available. This JS code is a simple facade that
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provides a clear JS API, real Error objects, and simple non-multi functions. Each
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method returns a <code>Promise</code> object.</p></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="propTitle"><a class="anchor" name="getitem"></a><span class="propType">static </span>getItem<span class="propType">(key, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#getitem">#</a></h4><div><p>Fetches <code>key</code> and passes the result to <code>callback</code>, along with an <code>Error</code> if
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there is any. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="setitem"></a><span class="propType">static </span>setItem<span class="propType">(key, value, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#setitem">#</a></h4><div><p>Sets <code>value</code> for <code>key</code> and calls <code>callback</code> on completion, along with an
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<code>Error</code> if there is any. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="removeitem"></a><span class="propType">static </span>removeItem<span class="propType">(key, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#removeitem">#</a></h4><div><p>Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="mergeitem"></a><span class="propType">static </span>mergeItem<span class="propType">(key, value, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#mergeitem">#</a></h4><div><p>Merges existing value with input value, assuming they are stringified json.
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Returns a <code>Promise</code> object. Not supported by all native implementations.</p><p>Example:</p><div class="prism language-javascript"><span class="token keyword">let</span> UID123_object <span class="token operator">=</span> <span class="token punctuation">{</span>
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name<span class="token punctuation">:</span> <span class="token string">'Chris'</span><span class="token punctuation">,</span>
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age<span class="token punctuation">:</span> <span class="token number">30</span><span class="token punctuation">,</span>
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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>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token comment" spellcheck="true">
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// need only define what will be added or updated
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</span><span class="token keyword">let</span> UID123_delta <span class="token operator">=</span> <span class="token punctuation">{</span>
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age<span class="token punctuation">:</span> <span class="token number">31</span><span class="token punctuation">,</span>
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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>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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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>
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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>
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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>
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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>
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<span class="token comment" spellcheck="true"> // => {'name':'Chris','age':31,'traits':{'shoe_size':10,'hair':'brown','eyes':'blue'}}
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</span> <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><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="clear"></a><span class="propType">static </span>clear<span class="propType">(callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#clear">#</a></h4><div><p>Erases <em>all</em> AsyncStorage for all clients, libraries, etc. You probably
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don't want to call this - use removeItem or multiRemove to clear only your
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own keys instead. Returns a <code>Promise</code> object.</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="getallkeys"></a><span class="propType">static </span>getAllKeys<span class="propType">(callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#getallkeys">#</a></h4><div><p>Gets <em>all</em> keys known to the app, for all callers, libraries, etc. Returns a <code>Promise</code> object.</p><p>Example: see multiGet for example</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="flushgetrequests"></a><span class="propType">static </span>flushGetRequests<span class="propType">()</span> <a class="hash-link" href="docs/asyncstorage.html#flushgetrequests">#</a></h4><div><p>Flushes any pending requests using a single multiget</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiget"></a><span class="propType">static </span>multiGet<span class="propType">(keys, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multiget">#</a></h4><div><p>multiGet invokes callback with an array of key-value pair arrays that
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matches the input format of multiSet. Returns a <code>Promise</code> object.</p><p> multiGet(['k1', 'k2'], cb) -> cb([['k1', 'val1'], ['k2', 'val2']])</p><p>Example:</p><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>
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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>
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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>
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<span class="token comment" spellcheck="true"> // get at each store's key/value so you can work with it
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</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>
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<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>
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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><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiset"></a><span class="propType">static </span>multiSet<span class="propType">(keyValuePairs, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multiset">#</a></h4><div><p>multiSet and multiMerge take arrays of key-value array pairs that match
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the output of multiGet, e.g. Returns a <code>Promise</code> object.</p><p> multiSet([['k1', 'val1'], ['k2', 'val2']], cb);</p><p>Example: see multiMerge for an example</p></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multiremove"></a><span class="propType">static </span>multiRemove<span class="propType">(keys, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multiremove">#</a></h4><div><p>Delete all the keys in the <code>keys</code> array. Returns a <code>Promise</code> object.</p><p>Example:</p><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>
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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>
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<span class="token comment" spellcheck="true"> // keys k1 & k2 removed, if they existed
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</span> <span class="token comment" spellcheck="true"> // do most stuff after removal (if you want)
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||
</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></div></div></div><div class="prop"><h4 class="propTitle"><a class="anchor" name="multimerge"></a><span class="propType">static </span>multiMerge<span class="propType">(keyValuePairs, callback?)</span> <a class="hash-link" href="docs/asyncstorage.html#multimerge">#</a></h4><div><p>Merges existing values with input values, assuming they are stringified
|
||
json. Returns a <code>Promise</code> object.</p><p>Not supported by all native implementations.</p><p>Example:</p><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 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> <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></div></div></div></div></span><span><h3><a class="anchor" name="properties"></a>Properties <a class="hash-link" href="docs/asyncstorage.html#properties">#</a></h3><div class="props"></div></span></div><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/0.28-stable/Examples/UIExplorer/AsyncStorageExample.js">Edit on GitHub</a></td></tr></tbody></table><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>
|
||
|
||
<span class="token keyword">var</span> BasicStorageExample <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createClass<span class="token punctuation">(</span></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><span class="token punctuation">,</span>
|
||
|
||
async <span class="token function">_loadInitialState<span class="token punctuation">(</span></span><span class="token punctuation">)</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">getInitialState<span class="token punctuation">(</span></span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||
<span class="token keyword">return</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 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><span class="token punctuation">,</span>
|
||
|
||
async <span class="token function">_onValueChange<span class="token punctuation">(</span></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">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>
|
||
|
||
async <span class="token function">_removeStorage<span class="token punctuation">(</span></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">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>
|
||
|
||
<span class="token function">_appendMessage<span class="token punctuation">(</span></span>message<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>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>
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