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+/*
+ * 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.
+ */
+
+
+jQuery.extend({
+ historyCurrentHash: undefined,
+
+ historyCallback: undefined,
+
+ historyInit: function(callback){
+ jQuery.historyCallback = callback;
+ var current_hash = location.hash;
+
+ jQuery.historyCurrentHash = current_hash;
+ if(jQuery.browser.msie) {
+ // To stop the callback firing twice during initilization if no hash present
+ if (jQuery.historyCurrentHash == '') {
+ jQuery.historyCurrentHash = '#';
+ }
+
+ // add hidden iframe for IE
+ $("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
+ var ihistory = $("#jQuery_history")[0];
+ var iframe = ihistory.contentWindow.document;
+ iframe.open();
+ iframe.close();
+ iframe.location.hash = current_hash;
+ }
+ else if ($.browser.safari) {
+ // etablish back/forward stacks
+ jQuery.historyBackStack = [];
+ jQuery.historyBackStack.length = history.length;
+ jQuery.historyForwardStack = [];
+
+ jQuery.isFirst = true;
+ }
+ jQuery.historyCallback(current_hash.replace(/^#/, ''));
+ setInterval(jQuery.historyCheck, 100);
+ },
+
+ historyAddHistory: function(hash) {
+ // This makes the looping function do something
+ jQuery.historyBackStack.push(hash);
+
+ jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
+ this.isFirst = true;
+ },
+
+ historyCheck: function(){
+ if(jQuery.browser.msie) {
+ // On IE, check for location.hash of iframe
+ var ihistory = $("#jQuery_history")[0];
+ var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
+ var current_hash = iframe.location.hash;
+ if(current_hash != jQuery.historyCurrentHash) {
+
+ location.hash = current_hash;
+ jQuery.historyCurrentHash = current_hash;
+ jQuery.historyCallback(current_hash.replace(/^#/, ''));
+
+ }
+ } else if ($.browser.safari) {
+ if (!jQuery.dontCheck) {
+ var historyDelta = history.length - jQuery.historyBackStack.length;
+
+ if (historyDelta) { // back or forward button has been pushed
+ jQuery.isFirst = false;
+ if (historyDelta < 0) { // back button has been pushed
+ // move items to forward stack
+ for (var i = 0; i < Math.abs(historyDelta); i++) jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
+ } else { // forward button has been pushed
+ // move items to back stack
+ for (var i = 0; i < historyDelta; i++) jQuery.historyBackStack.push(jQuery.historyForwardStack.shift());
+ }
+ var cachedHash = jQuery.historyBackStack[jQuery.historyBackStack.length - 1];
+ if (cachedHash != undefined) {
+ jQuery.historyCurrentHash = location.hash;
+ jQuery.historyCallback(cachedHash);
+ }
+ } else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] == undefined && !jQuery.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) {
+ jQuery.historyCallback(document.URL.split('#')[1]);
+ } else {
+ var current_hash = location.hash;
+ jQuery.historyCallback('');
+ }
+ jQuery.isFirst = true;
+ }
+ }
+ } else {
+ // otherwise, check for location.hash
+ var current_hash = location.hash;
+ if(current_hash != jQuery.historyCurrentHash) {
+ jQuery.historyCurrentHash = current_hash;
+ jQuery.historyCallback(current_hash.replace(/^#/, ''));
+ }
+ }
+ },
+ historyLoad: function(hash){
+ var newhash;
+
+ if (jQuery.browser.safari) {
+ newhash = hash;
+ }
+ else {
+ newhash = '#' + hash;
+ location.hash = newhash;
+ }
+ jQuery.historyCurrentHash = newhash;
+
+ if(jQuery.browser.msie) {
+ var ihistory = $("#jQuery_history")[0];
+ var iframe = ihistory.contentWindow.document;
+ iframe.open();
+ iframe.close();
+ iframe.location.hash = newhash;
+ jQuery.historyCallback(hash);
+ }
+ else if (jQuery.browser.safari) {
+ jQuery.dontCheck = true;
+ // Manually keep track of the history values for Safari
+ this.historyAddHistory(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() {jQuery.dontCheck = false;};
+ window.setTimeout(fn, 200);
+ jQuery.historyCallback(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 {
+ jQuery.historyCallback(hash);
+ }
+ }
+});
+
+