https://faktopedia.pl/res/js/history.js

1/*
2 * jQuery history plugin
3 *
4 * Copyright (c) 2006 Taku Sano (Mikage Sawatari)
5 * Licensed under the MIT License:
6 *   http://www.opensource.org/licenses/mit-license.php
7 *
8 * Modified by Lincoln Cooper to add Safari support and only call the callback once during initialization
9 * for msie when no initial hash supplied.
10 * API rewrite by Lauris Buk�is-Haberkorns
11 */
12
13(function($) {
14
15function History()
16{
17	this._curHash = '';
18	this._callback = function(hash){};
19};
20
21$.extend(History.prototype, {
22
23	init: function(callback) {
24		this._callback = callback;
25		this._curHash = location.hash;
26
27		if($.browser.msie) {
28			// To stop the callback firing twice during initilization if no hash present
29			if (this._curHash == '') {
30				this._curHash = '#';
31			}
32
33			// add hidden iframe for IE
34			$("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
35			var iframe = $("#jQuery_history")[0].contentWindow.document;
36			iframe.open();
37			iframe.close();
38			iframe.location.hash = this._curHash;
39		}
40		else if ($.browser.safari) {
41			// etablish back/forward stacks
42			this._historyBackStack = [];
43			this._historyBackStack.length = history.length;
44			this._historyForwardStack = [];
45			this._isFirst = true;
46			this._dontCheck = false;
47		}
48		this._callback(this._curHash.replace(/^#/, ''));
49		setInterval(this._check, 100);
50	},
51
52	add: function(hash) {
53		// This makes the looping function do something
54		this._historyBackStack.push(hash);
55		
56		this._historyForwardStack.length = 0; // clear forwardStack (true click occured)
57		this._isFirst = true;
58	},
59	
60	_check: function() {
61		if($.browser.msie) {
62			// On IE, check for location.hash of iframe
63			var ihistory = $("#jQuery_history")[0];
64			var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
65			var current_hash = iframe.location.hash;
66			if(current_hash != $.history._curHash) {
67			
68				location.hash = current_hash;
69				$.history._curHash = current_hash;
70				$.history._callback(current_hash.replace(/^#/, ''));
71				
72			}
73		} else if ($.browser.safari) {
74			if (!$.history._dontCheck) {
75				var historyDelta = history.length - $.history._historyBackStack.length;
76				
77				if (historyDelta) { // back or forward button has been pushed
78					$.history._isFirst = false;
79					if (historyDelta < 0) { // back button has been pushed
80						// move items to forward stack
81						for (var i = 0; i < Math.abs(historyDelta); i++) $.history._historyForwardStack.unshift($.history._historyBackStack.pop());
82					} else { // forward button has been pushed
83						// move items to back stack
84						for (var i = 0; i < historyDelta; i++) $.history._historyBackStack.push($.history._historyForwardStack.shift());
85					}
86					var cachedHash = $.history._historyBackStack[$.history._historyBackStack.length - 1];
87					if (cachedHash != undefined) {
88						$.history._curHash = location.hash;
89						$.history._callback(cachedHash);
90					}
91				} else if ($.history._historyBackStack[$.history._historyBackStack.length - 1] == undefined && !$.history._isFirst) {
92					// back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
93					// document.URL doesn't change in Safari
94					if (document.URL.indexOf('#') >= 0) {
95						$.history._callback(document.URL.split('#')[1]);
96					} else {
97						$.history._callback('');
98					}
99					$.history._isFirst = true;
100				}
101			}
102		} else {
103			// otherwise, check for location.hash
104			var current_hash = location.hash;
105			if(current_hash != $.history._curHash) {
106				$.history._curHash = current_hash;
107				$.history._callback(current_hash.replace(/^#/, ''));
108			}
109		}
110	},
111
112	load: function(hash) {
113		var newhash;
114		
115		if ($.browser.safari) {
116			newhash = hash;
117		} else {
118			newhash = '#' + hash;
119			location.hash = newhash;
120		}
121		this._curHash = newhash;
122		
123		if ($.browser.msie) {
124			var ihistory = $("#jQuery_history")[0]; // TODO: need contentDocument?
125			var iframe = ihistory.contentWindow.document;
126			iframe.open();
127			iframe.close();
128			iframe.location.hash = newhash;
129			this._callback(hash);
130		}
131		else if ($.browser.safari) {
132			this._dontCheck = true;
133			// Manually keep track of the history values for Safari
134			this.add(hash);
135			
136			// Wait a while before allowing checking so that Safari has time to update the "history" object

137			// correctly (otherwise the check loop would detect a false change in hash).
138			var fn = function() {$.history._dontCheck = false;};
139			window.setTimeout(fn, 200);
140			this._callback(hash);
141			// N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
142			//      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
143			//      URL in the browser and the "history" object are both updated correctly.
144			location.hash = newhash;
145		}
146		else {
147		  this._callback(hash);
148		}
149	}
150});
151
152$(document).ready(function() {
153	$.history = new History(); // singleton instance
154});
155
156})(jQuery);