1 files changed, 48 insertions, 0 deletions
diff --git a/admin/themes/default/js/LocalStorageCache.js b/admin/themes/default/js/LocalStorageCache.js
new file mode 100644
index 000000000..49a4fa98d
--- /dev/null
+++ b/admin/themes/default/js/LocalStorageCache.js
@@ -0,0 +1,48 @@
+var LocalStorageCache = function(key, lifetime, loader) {
+  this.key = key;
+  this.lifetime = lifetime*1000;
+  this.loader = loader;
+  
+  this.storage = window.localStorage;
+  this.ready = !!this.storage;
+};
+
+LocalStorageCache.prototype.get = function(callback) {
+  var now = new Date().getTime(),
+      that = this;
+  
+  if (this.ready && this.storage[this.key] != undefined) {
+    var cache = JSON.parse(this.storage[this.key]);
+    
+    if (now - cache.timestamp <= this.lifetime) {
+      callback(cache.data);
+      return;
+    }
+  }
+  
+  this.loader(function(data) {
+    if (that.ready) {
+      that.storage[that.key] = JSON.stringify({
+        timestamp: now,
+        data: data
+      });
+    }
+    
+    callback(data);
+  });
+};
+
+LocalStorageCache.prototype.set = function(data) {
+  if (this.ready) {
+    that.storage[that.key] = JSON.stringify({
+      timestamp: new Date().getTime(),
+      data: data
+    });
+  }
+};
+
+LocalStorageCache.prototype.clear = function() {
+  if (this.ready) {
+    this.storage.removeItem(this.key);
+  }
+};
+\ No newline at end of file