Mootools Cached Request with localStorage

Request.Cacheable.js

/*
---

name: Request.Cacheable

description: Extends the basic Request Class with lazy localStorage Cache. Tested: No. Guaranteed to work: No. Limitations: Many. The Attribute Name in the Cache Object is only the provided url. You can use another Prefix though.

license: MIT-style license.

requires: [Request]

provides: Request.Cacheable

...
*/
(function(){
	'use strict';
	Request.Cacheable = new Class({
		Extends: Request,
		options: {
			storageKey: 'Request.Cacheable',
			requestKeyPrefix: ''
		},
		initialize: function (options) {
			this.parent(options);
		},
		send: function (options) {
			var type, opt;
			this.parent(options);
			if (!localStorage) { return; }
			type = typeOf(options);
			if (type === 'string' || type === 'element') {
				options = {data: options};
			}
			opt = this.options.requestKeyPrefix + ((options ? options.url : null) || this.options.url);
			this.store = JSON.decode(localStorage.getItem(this.options.storageKey)) || {};
			if (typeof this.store[opt] !== 'undefined') {
				this.onSuccess.apply(this, this.store[opt]);
			}

		},
		success: function (text, xml) {
			var opt;
			if (localStorage) {
				opt = this.options.requestKeyPrefix +  this.options.url;
				this.store = JSON.decode(localStorage.getItem(this.options.storageKey)) || {};
				this.store[opt] = Array.prototype.slice.call(arguments);
				localStorage.setItem(this.options.storageKey, JSON.encode(this.store));
			}
			this.parent(text, xml);
		},
		deleteAll: function () {// ;)
			localStorage.removeItem(this.options.storageKey);
		}
	});
}());