docs/source/LocalStorageProvider.html

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  18   <pre class="prettyprint lang-js"><span id='Ext-state-LocalStorageProvider'>/**
  19 </span> * @class Ext.state.LocalStorageProvider
  20  * @extends Ext.state.Provider
  21  * A Provider implementation which saves and retrieves state via the HTML5 localStorage object.
  22  * If the browser does not support local storage, an exception will be thrown upon instantiating
  23  * this class.
  24  */
  25
  26 Ext.define('Ext.state.LocalStorageProvider', {
  27     /* Begin Definitions */
  28
  29     extend: 'Ext.state.Provider',
  30
  31     alias: 'state.localstorage',
  32
  33     /* End Definitions */
  34
  35     constructor: function(){
  36         var me = this;
  37         me.callParent(arguments);
  38         me.store = me.getStorageObject();
  39         me.state = me.readLocalStorage();
  40     },
  41
  42     readLocalStorage: function(){
  43         var store = this.store,
  44             i = 0,
  45             len = store.length,
  46             prefix = this.prefix,
  47             prefixLen = prefix.length,
  48             data = {},
  49             key;
  50
  51         for (; i &lt; len; ++i) {
  52             key = store.key(i);
  53             if (key.substring(0, prefixLen) == prefix) {
  54                 data[key.substr(prefixLen)] = this.decodeValue(store.getItem(key));
  55             }
  56         }
  57         return data;
  58     },
  59
  60     set : function(name, value){
  61         var me = this;
  62
  63         me.clear(name);
  64         if (typeof value == &quot;undefined&quot; || value === null) {
  65             return;
  66         }
  67         me.store.setItem(me.prefix + name, me.encodeValue(value));
  68         me.callParent(arguments);
  69     },
  70
  71     // private
  72     clear : function(name){
  73         this.store.removeItem(this.prefix + name);
  74         this.callParent(arguments);
  75     },
  76
  77     getStorageObject: function(){
  78         try {
  79             var supports = 'localStorage' in window &amp;&amp; window['localStorage'] !== null;
  80             if (supports) {
  81                 return window.localStorage;
  82             }
  83         } catch (e) {
  84             return false;
  85         }
  86         //&lt;debug&gt;
  87         Ext.Error.raise('LocalStorage is not supported by the current browser');
  88         //&lt;/debug&gt;
  89     }
  90 });
  91 </pre>
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