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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);
}
}
});
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