"

From 2010.igem.org

/*

* jQuery history plugin
*
* Copyright (c) 2006 Taku Sano (Mikage Sawatari)
* Licensed under the MIT License:
*   http://www.opensource.org/licenses/mit-license.php
*
* Modified by Lincoln Cooper to add Safari support and only call the callback once during initialization
* for msie when no initial hash supplied.
* API rewrite by Lauris Buk?is-Haberkorns
*/

(function($) {

function History() { this._curHash = ; this._callback = function(hash){}; this.is_chrome = /chrome/.test( navigator.userAgent.toLowerCase() ); };

$.extend(History.prototype, {

init: function(callback) { this._callback = callback; this._curHash = location.hash;

if($.browser.msie) { // To stop the callback firing twice during initilization if no hash present if (this._curHash == ) { this._curHash = '#'; }

// add hidden iframe for IE $("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>'); var iframe = $("#jQuery_history")[0].contentWindow.document; iframe.open(); iframe.close(); iframe.location.hash = this._curHash; } else if ($.browser.safari) { // etablish back/forward stacks this._historyBackStack = []; this._historyBackStack.length = history.length; this._historyForwardStack = []; this._isFirst = true; this._dontCheck = false; } this._callback(this._curHash.replace(/^#/, )); setInterval(this._check, 100); },

add: function(hash) { // This makes the looping function do something this._historyBackStack.push(hash);

this._historyForwardStack.length = 0; // clear forwardStack (true click occured) this._isFirst = true; },

_check: function() { if($.browser.msie) { // On IE, check for location.hash of iframe var ihistory = $("#jQuery_history")[0]; var iframe = ihistory.contentDocument || ihistory.contentWindow.document; var current_hash = iframe.location.hash; if(current_hash != $.history._curHash) {

location.hash = current_hash; $.history._curHash = current_hash; $.history._callback(current_hash.replace(/^#/, ));

} } else if ($.browser.safari && !this.is_chrome) { if (!$.history._dontCheck) { var historyDelta = history.length - $.history._historyBackStack.length;

if (historyDelta) { // back or forward button has been pushed $.history._isFirst = false; if (historyDelta < 0) { // back button has been pushed // move items to forward stack for (var i = 0; i < Math.abs(historyDelta); i++) $.history._historyForwardStack.unshift($.history._historyBackStack.pop()); } else { // forward button has been pushed // move items to back stack for (var i = 0; i < historyDelta; i++) $.history._historyBackStack.push($.history._historyForwardStack.shift()); } var cachedHash = $.history._historyBackStack[$.history._historyBackStack.length - 1]; if (cachedHash != undefined) { $.history._curHash = location.hash; $.history._callback(cachedHash); } } else if ($.history._historyBackStack[$.history._historyBackStack.length - 1] == undefined && !$.history._isFirst) { // back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark) // document.URL doesn't change in Safari if (document.URL.indexOf('#') >= 0) { $.history._callback(document.URL.split('#')[1]); } else { $.history._callback(); } $.history._isFirst = true; } } } else { // otherwise, check for location.hash var current_hash = location.hash; if(current_hash != $.history._curHash) { $.history._curHash = current_hash; $.history._callback(current_hash.replace(/^#/, )); } } },

load: function(hash) { var newhash;

if ($.browser.safari) { newhash = hash; } else { newhash = '#' + hash; location.hash = newhash; } this._curHash = newhash;

if ($.browser.msie) { var ihistory = $("#jQuery_history")[0]; // TODO: need contentDocument? var iframe = ihistory.contentWindow.document; iframe.open(); iframe.close(); iframe.location.hash = newhash; this._callback(hash); } else if ($.browser.safari) { this._dontCheck = true; // Manually keep track of the history values for Safari this.add(hash);

// Wait a while before allowing checking so that Safari has time to update the "history" object // correctly (otherwise the check loop would detect a false change in hash). var fn = function() {$.history._dontCheck = false;}; window.setTimeout(fn, 200); this._callback(hash); // N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards. // By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the // URL in the browser and the "history" object are both updated correctly. location.hash = newhash; } else { this._callback(hash); } } });

$(document).ready(function() { $.history = new History(); // singleton instance });

})(jQuery);