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File: public/js/lib/backbone/backbone.localStorage.js

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File: public/js/lib/backbone/backbone.localStorage.js
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Description: Auxiliary data
Class: Silex MVC Blog
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/** * Backbone localStorage Adapter * Version 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; }));