Upgrade to ExtJS 4.0.0 - Released 04/26/2011

[extjs.git] / src / state / LocalStorageProvider.js

diff --git a/src/state/LocalStorageProvider.js b/src/state/LocalStorageProvider.js
new file mode 100644 (file)
index 0000000..5317ccf
--- /dev/null
+++ b/src/state/LocalStorageProvider.js
@@ -0,0 +1,65 @@
+Ext.define('Ext.state.LocalStorageProvider', {
+    /* Begin Definitions */
+    
+    extend: 'Ext.state.Provider',
+    
+    alias: 'state.localstorage',
+    
+    /* End Definitions */
+   
+    constructor: function(){
+        var me = this;
+        me.callParent(arguments);
+        me.store = me.getStorageObject();
+        me.state = me.readLocalStorage();
+    },
+    
+    readLocalStorage: function(){
+        var store = this.store,
+            i = 0,
+            len = store.length,
+            prefix = this.prefix,
+            prefixLen = prefix.length,
+            data = {},
+            key;
+            
+        for (; i < len; ++i) {
+            key = store.key(i);
+            if (key.substring(0, prefixLen) == prefix) {
+                data[key.substr(prefixLen)] = this.decodeValue(store.getItem(key));
+            }            
+        }
+        return data;
+    },
+    
+    set : function(name, value){
+        var me = this;
+        
+        me.clear(name);
+        if (typeof value == "undefined" || value === null) {
+            return;
+        }
+        me.store.setItem(me.prefix + name, me.encodeValue(value));
+        me.callParent(arguments);
+    },
+
+    // private
+    clear : function(name){
+        this.store.removeItem(this.prefix + name);
+        this.callParent(arguments);
+    },
+    
+    getStorageObject: function(){
+        try {
+            var supports = 'localStorage' in window && window['localStorage'] !== null;
+            if (supports) {
+                return window.localStorage;
+            }
+        } catch (e) {
+            return false;
+        }
+        //<debug>
+        Ext.Error.raise('LocalStorage is not supported by the current browser');
+        //</debug>
+    }    
+});