Add backbone.localStorage.js

Libraries/backbone.localStorage.js

+/**
+ * Backbone localStorage Adapter
+ * Version 1.1.0
+ *
+ * https://github.com/jeromegn/Backbone.localStorage
+ */
+(function (root, factory) {
+   if (typeof define === "function" && define.amd) {
+      // AMD. Register as an anonymous module.
+      define(["underscore","backbone"], function(_, Backbone) {
+        // Use global variables if the locals is undefined.
+        return factory(_ || root._, Backbone || root.Backbone);
+      });
+   } else {
+      // RequireJS isn't being used. Assume underscore and backbone is loaded in <script> tags
+      factory(_, Backbone);
+   }
+}(this, function(_, Backbone) {
+// A simple module to replace `Backbone.sync` with *localStorage*-based
+// persistence. Models are given GUIDS, and saved into a JSON object. Simple
+// as that.
+
+// Hold reference to Underscore.js and Backbone.js in the closure in order
+// to make things work even if they are removed from the global namespace
+
+// Generate four random hex digits.
+function S4() {
+   return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
+};
+
+// Generate a pseudo-GUID by concatenating random hexadecimal.
+function guid() {
+   return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
+};
+
+// Our Store is represented by a single JS object in *localStorage*. Create it
+// with a meaningful name, like the name you'd give a table.
+// window.Store is deprectated, use Backbone.LocalStorage instead
+Backbone.LocalStorage = window.Store = function(name) {
+  this.name = name;
+  var store = this.localStorage().getItem(this.name);
+  this.records = (store && store.split(",")) || [];
+};
+
+_.extend(Backbone.LocalStorage.prototype, {
+
+  // Save the current state of the **Store** to *localStorage*.
+  save: function() {
+    this.localStorage().setItem(this.name, this.records.join(","));
+  },
+
+  // Add a model, giving it a (hopefully)-unique GUID, if it doesn't already
+  // have an id of it's own.
+  create: function(model) {
+    if (!model.id) {
+      model.id = guid();
+      model.set(model.idAttribute, model.id);
+    }
+    this.localStorage().setItem(this.name+"-"+model.id, JSON.stringify(model));
+    this.records.push(model.id.toString());
+    this.save();
+    return this.find(model);
+  },
+
+  // Update a model by replacing its copy in `this.data`.
+  update: function(model) {
+    this.localStorage().setItem(this.name+"-"+model.id, JSON.stringify(model));
+    if (!_.include(this.records, model.id.toString()))
+      this.records.push(model.id.toString()); this.save();
+    return this.find(model);
+  },
+
+  // Retrieve a model from `this.data` by id.
+  find: function(model) {
+    return this.jsonData(this.localStorage().getItem(this.name+"-"+model.id));
+  },
+
+  // Return the array of all models currently in storage.
+  findAll: function() {
+    return _(this.records).chain()
+      .map(function(id){
+        return this.jsonData(this.localStorage().getItem(this.name+"-"+id));
+      }, this)
+      .compact()
+      .value();
+  },
+
+  // Delete a model from `this.data`, returning it.
+  destroy: function(model) {
+    if (model.isNew())
+      return false
+    this.localStorage().removeItem(this.name+"-"+model.id);
+    this.records = _.reject(this.records, function(id){
+      return id === model.id.toString();
+    });
+    this.save();
+    return model;
+  },
+
+  localStorage: function() {
+    return localStorage;
+  },
+  
+  // fix for "illegal access" error on Android when JSON.parse is passed null
+  jsonData: function (data) {
+      return data && JSON.parse(data);
+  }
+
+});
+
+// localSync delegate to the model or collection's
+// *localStorage* property, which should be an instance of `Store`.
+// window.Store.sync and Backbone.localSync is deprectated, use Backbone.LocalStorage.sync instead
+Backbone.LocalStorage.sync = window.Store.sync = Backbone.localSync = function(method, model, options) {
+  var store = model.localStorage || model.collection.localStorage;
+
+  var resp, errorMessage, syncDfd = $.Deferred && $.Deferred(); //If $ is having Deferred - use it. 
+
+  try {
+
+    switch (method) {
+      case "read":
+        resp = model.id != undefined ? store.find(model) : store.findAll();
+        break;
+      case "create":
+        resp = store.create(model);
+        break;
+      case "update":
+        resp = store.update(model);
+        break;
+      case "delete":
+        resp = store.destroy(model);
+        break;
+    }
+
+  } catch(error) {
+    if (error.code === DOMException.QUOTA_EXCEEDED_ERR && window.localStorage.length === 0)
+      errorMessage = "Private browsing is unsupported";
+    else
+      errorMessage = error.message;
+  }
+
+  if (resp) {
+    if (options && options.success)
+      if (Backbone.VERSION === "0.9.10") {
+        options.success(model, resp, options);
+      } else {
+        options.success(resp);
+      }
+    if (syncDfd)
+      syncDfd.resolve(resp);
+
+  } else {
+    errorMessage = errorMessage ? errorMessage
+                                : "Record Not Found";
+    
+    if (options && options.error)
+      if (Backbone.VERSION === "0.9.10") {
+        options.error(model, errorMessage, options);
+      } else {
+        options.error(errorMessage);
+      }
+      
+    if (syncDfd)
+      syncDfd.reject(errorMessage);
+  }
+  
+  // add compatibility with $.ajax
+  // always execute callback for success and error
+  if (options && options.complete) options.complete(resp);
+
+  return syncDfd && syncDfd.promise();
+};
+
+Backbone.ajaxSync = Backbone.sync;
+
+Backbone.getSyncMethod = function(model) {
+  if(model.localStorage || (model.collection && model.collection.localStorage)) {
+    return Backbone.localSync;
+  }
+
+  return Backbone.ajaxSync;
+};
+
+// Override 'Backbone.sync' to default to localSync,
+// the original 'Backbone.sync' is still available in 'Backbone.ajaxSync'
+Backbone.sync = function(method, model, options) {
+  return Backbone.getSyncMethod(model).apply(this, [method, model, options]);
+};
+
+return Backbone.LocalStorage;
+}));