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Viewing changes to jquery-history/jquery.history.js

  • Committer: Bazaar Package Importer
  • Author(s): Marcelo Jorge Vieira (metal)
  • Date: 2011-04-15 17:28:14 UTC
  • Revision ID: james.westby@ubuntu.com-20110415172814-kvs9sfnycn3o3hk6
Tags: upstream-3
Import upstream version 3

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jquery-history/jquery.history.js
 
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/*
 
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 * jQuery history plugin
 
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 * 
 
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 * sample page: http://www.mikage.to/jquery/jquery_history.html
 
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 *
 
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 * Copyright (c) 2006-2009 Taku Sano (Mikage Sawatari)
 
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 * Licensed under the MIT License:
 
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 *   http://www.opensource.org/licenses/mit-license.php
 
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 *
 
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 * Modified by Lincoln Cooper to add Safari support and only call the callback once during initialization
 
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 * for msie when no initial hash supplied.
 
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 */
 
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jQuery.extend({
 
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        historyCurrentHash: undefined,
 
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        historyCallback: undefined,
 
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        historyIframeSrc: undefined,
 
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        historyInit: function(callback, src){
 
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                jQuery.historyCallback = callback;
 
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                if (src) jQuery.historyIframeSrc = src;
 
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                var current_hash = location.hash.replace(/\?.*$/, '');
 
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                jQuery.historyCurrentHash = current_hash;
 
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                // if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
 
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                if (jQuery.browser.msie) {
 
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                        // To stop the callback firing twice during initilization if no hash present
 
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                        if (jQuery.historyCurrentHash == '') {
 
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                        jQuery.historyCurrentHash = '#';
 
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                }
 
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                        // add hidden iframe for IE
 
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                        jQuery("body").prepend('<iframe id="jQuery_history" style="display: none;"'+
 
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                                (jQuery.historyIframeSrc ? ' src="'+jQuery.historyIframeSrc+'"' : '')
 
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                                +'></iframe>'
 
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                        );
 
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                        var ihistory = jQuery("#jQuery_history")[0];
 
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                        var iframe = ihistory.contentWindow.document;
 
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                        iframe.open();
 
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                        iframe.close();
 
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                        iframe.location.hash = current_hash;
 
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                }
 
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                else if (jQuery.browser.safari) {
 
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                        // etablish back/forward stacks
 
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                        jQuery.historyBackStack = [];
 
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                        jQuery.historyBackStack.length = history.length;
 
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                        jQuery.historyForwardStack = [];
 
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                        jQuery.lastHistoryLength = history.length;
 
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                        jQuery.isFirst = true;
 
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                }
 
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                if(current_hash)
 
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                        jQuery.historyCallback(current_hash.replace(/^#/, ''));
 
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                setInterval(jQuery.historyCheck, 100);
 
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        },
 
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        historyAddHistory: function(hash) {
 
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                // This makes the looping function do something
 
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                jQuery.historyBackStack.push(hash);
 
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                jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
 
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                this.isFirst = true;
 
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        },
 
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        historyCheck: function(){
 
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                // if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
 
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                if (jQuery.browser.msie) {
 
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                        // On IE, check for location.hash of iframe
 
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                        var ihistory = jQuery("#jQuery_history")[0];
 
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                        var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
 
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                        var current_hash = iframe.location.hash.replace(/\?.*$/, '');
 
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                        if(current_hash != jQuery.historyCurrentHash) {
 
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                                location.hash = current_hash;
 
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                                jQuery.historyCurrentHash = current_hash;
 
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                                jQuery.historyCallback(current_hash.replace(/^#/, ''));
 
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                        }
 
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                } else if (jQuery.browser.safari) {
 
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                        if(jQuery.lastHistoryLength == history.length && jQuery.historyBackStack.length > jQuery.lastHistoryLength) {
 
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                                jQuery.historyBackStack.shift();
 
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                        }
 
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                        if (!jQuery.dontCheck) {
 
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                                var historyDelta = history.length - jQuery.historyBackStack.length;
 
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                                jQuery.lastHistoryLength = history.length;
 
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                                if (historyDelta) { // back or forward button has been pushed
 
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                                        jQuery.isFirst = false;
 
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                                        if (historyDelta < 0) { // back button has been pushed
 
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                                                // move items to forward stack
 
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                                                for (var i = 0; i < Math.abs(historyDelta); i++) jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
 
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                                        } else { // forward button has been pushed
 
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                                                // move items to back stack
 
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                                                for (var i = 0; i < historyDelta; i++) jQuery.historyBackStack.push(jQuery.historyForwardStack.shift());
 
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                                        }
 
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                                        var cachedHash = jQuery.historyBackStack[jQuery.historyBackStack.length - 1];
 
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                                        if (cachedHash != undefined) {
 
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                                                jQuery.historyCurrentHash = location.hash.replace(/\?.*$/, '');
 
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                                                jQuery.historyCallback(cachedHash);
 
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                                        }
 
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                                } else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] == undefined && !jQuery.isFirst) {
 
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                                        // back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
 
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                                        // document.URL doesn't change in Safari
 
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                                        if (location.hash) {
 
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                                                var current_hash = location.hash;
 
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                                                jQuery.historyCallback(location.hash.replace(/^#/, ''));
 
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                                        } else {
 
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                                                var current_hash = '';
 
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                                                jQuery.historyCallback('');
 
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                                        }
 
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                                        jQuery.isFirst = true;
 
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                                }
 
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                        }
 
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                } else {
 
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                        // otherwise, check for location.hash
 
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                        var current_hash = location.hash.replace(/\?.*$/, '');
 
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                        if(current_hash != jQuery.historyCurrentHash) {
 
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                                jQuery.historyCurrentHash = current_hash;
 
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                                jQuery.historyCallback(current_hash.replace(/^#/, ''));
 
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                        }
 
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                }
 
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        },
 
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        historyLoad: function(hash){
 
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                var newhash;
 
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                hash = decodeURIComponent(hash.replace(/\?.*$/, ''));
 
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                if (jQuery.browser.safari) {
 
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                        newhash = hash;
 
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                }
 
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                else {
 
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                        newhash = '#' + hash;
 
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                        location.hash = newhash;
 
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                }
 
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                jQuery.historyCurrentHash = newhash;
 
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                // if ((jQuery.browser.msie) && (jQuery.browser.version < 8)) {
 
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                if (jQuery.browser.msie) {
 
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                        var ihistory = jQuery("#jQuery_history")[0];
 
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                        var iframe = ihistory.contentWindow.document;
 
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                        iframe.open();
 
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                        iframe.close();
 
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                        iframe.location.hash = newhash;
 
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                        jQuery.lastHistoryLength = history.length;
 
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                        jQuery.historyCallback(hash);
 
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                }
 
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                else if (jQuery.browser.safari) {
 
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                        jQuery.dontCheck = true;
 
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                        // Manually keep track of the history values for Safari
 
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                        this.historyAddHistory(hash);
 
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                        // Wait a while before allowing checking so that Safari has time to update the "history" object
 
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                        // correctly (otherwise the check loop would detect a false change in hash).
 
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                        var fn = function() {jQuery.dontCheck = false;};
 
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                        window.setTimeout(fn, 200);
 
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                        jQuery.historyCallback(hash);
 
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                        // N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
 
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                        //      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
 
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                        //      URL in the browser and the "history" object are both updated correctly.
 
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                        location.hash = newhash;
 
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                }
 
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                else {
 
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                  jQuery.historyCallback(hash);
 
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                }
 
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        }
 
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});
 
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