var HistoryManager = (function() { var HistoryManagerSingleton = new Class({ initialize: function() { this._currentLocation = this._getHash(); if (window.ie) { this.addState = this._addStateIE; this._iframe = new Element('iframe', { src: "javascript:''", styles: { 'position': 'absolute', 'top': '-1000px' } }).inject(document.body).contentWindow; $justForIE = function(hash) { this._getHash = function() { return hash; } this._monitorDefault.call(this); location.hash = hash; }.bind(this); var waitForLoad = function waitForIframeLoad() { if (this._iframe && this._iframe.document && this._iframe.document.body) { if (!this._iframe.document.body.innerHTML) this.addState(this._currentLocation, true); $clear(waitForLoad); } }.periodical(50, this); } else if (window.webkit419) { this._form = new Element("form", {method: 'get'}).inject(document.body); this._historyCounter = history.length; this._stateHistory = []; this._stateHistory[history.length] = this._getHash(); this.addState = this._addStateSafari; this._monitorSafari.periodical(250, this); } else if (window.opera && navigator.appVersion.toFloat() < 9.5) { this.addState = this._addStateDefault; $justForOpera = this._monitorDefault.bind(this); new Element('img', { src: "javascript:location.href='javascript:$justForOpera();';", style: "position: absolute; top: -1000px;" }).inject(document.body); } else { this.addState = this._addStateDefault; this._monitorDefault.periodical(250, this); } }, getCurrentLocation: function() { return this._currentLocation; }, _getHash: function() { return location.href.split('#')[1] || ''; }, _addStateIE: function(hash, override) { if (this._currentLocation == hash && !override) return; this._currentLocation = hash; this._iframe.document.write('Loaded'); this._iframe.document.close(); }, _addStateSafari: function(hash) { if (this._currentLocation == hash) return; this._form.setProperty('action', '#' + hash).submit() this._currentLocation = hash; this._stateHistory[history.length] = this._getHash(); this._historyCounter = history.length; }, _monitorSafari: function() { if (history.length != this._historyCounter) { this._historyCounter = history.length; this._currentLocation = this._stateHistory[history.length]; this.fireEvent('onHistoryChange', [this._currentLocation]); } }, _addStateDefault: function(hash) { if (this._currentLocation == hash) return; location.hash = '#' + hash; this._currentLocation = hash; }, _monitorDefault: function() { var hash = this._getHash(); if (hash != this._currentLocation) { this._currentLocation = hash; this.fireEvent('onHistoryChange', [hash]); } } }); HistoryManagerSingleton.implement(new Events); var singleton; return function() { return singleton ? singleton : singleton = new HistoryManagerSingleton(); } })();