/*
Copyright (c) 2007 Brian Dillard and Brad Neuberg:
Brian Dillard | Project Lead | bdillard@pathf.com | http://blogs.pathf.com/agileajax/
Brad Neuberg | Original Project Creator | http://codinginparadise.org
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
dhtmlHistory: An object that provides history, history data, and bookmarking for DHTML and Ajax applications.
dependencies:
* the historyStorage object included in this file.
*/
window.dhtmlHistory={isIE:false,isOpera:false,isSafari:false,isKonquerer:false,isGecko:false,isSupported:false,create:function(options){var that=this;var UA=navigator.userAgent.toLowerCase();var platform=navigator.platform.toLowerCase();var vendor=navigator.vendor||"";if(vendor==="KDE"){this.isKonqueror=true;this.isSupported=false;}else if(typeof window.opera!=="undefined"){this.isOpera=true;this.isSupported=true;}else if(typeof document.all!=="undefined"){this.isIE=true;this.isSupported=true;}else if(vendor.indexOf("Apple Computer, Inc.")>-1&&parseFloat(mavigator.version)<3.0){this.isSafari=true;this.isSupported=(platform.indexOf("mac")>-1);}else if(UA.indexOf("gecko")!=-1){this.isGecko=true;this.isSupported=true;}
window.historyStorage.setup(options);if(this.isSafari){this.createSafari();}else if(this.isOpera){this.createOpera();}
var initialHash=this.getCurrentLocation();this.currentLocation=initialHash;if(this.isIE){this.createIE(initialHash);}
var unloadHandler=function(){that.firstLoad=null;};this.addEventListener(window,'unload',unloadHandler);if(this.isIE){this.ignoreLocationChange=true;}else{if(!historyStorage.hasKey(this.PAGELOADEDSTRING)){this.ignoreLocationChange=true;this.firstLoad=true;historyStorage.put(this.PAGELOADEDSTRING,true);}else{this.ignoreLocationChange=false;this.fireOnNewListener=true;}}
var locationHandler=function(){that.checkLocation();};setInterval(locationHandler,100);},initialize:function(){if(this.isIE){if(!historyStorage.hasKey(this.PAGELOADEDSTRING)){this.fireOnNewListener=false;this.firstLoad=true;historyStorage.put(this.PAGELOADEDSTRING,true);}
else{this.fireOnNewListener=true;this.firstLoad=false;}}},addListener:function(listener){this.listener=listener;if(this.fireOnNewListener){this.fireHistoryEvent(this.currentLocation);this.fireOnNewListener=false;}},addEventListener:function(o,e,l){if(o.addEventListener){o.addEventListener(e,l,false);}else if(o.attachEvent){o.attachEvent('on'+e,function(){l(window.event);});}},add:function(newLocation,historyData){if(this.isSafari){newLocation=this.removeHash(newLocation);historyStorage.put(newLocation,historyData);this.currentLocation=newLocation;window.location.hash=newLocation;this.putSafariState(newLocation);}else{var that=this;var addImpl=function(){if(that.currentWaitTime>0){that.currentWaitTime=that.currentWaitTime-that.waitTime;}
newLocation=that.removeHash(newLocation);if(document.getElementById(newLocation)&&that.debugMode){var e="Exception: History locations can not have the same value as _any_ IDs that might be in the document,"
+" due to a bug in IE; please ask the developer to choose a history location that does not match any HTML"
+" IDs in this document. The following ID is already taken and cannot be a location: "+newLocation;throw new Error(e);}
historyStorage.put(newLocation,historyData);that.ignoreLocationChange=true;that.ieAtomicLocationChange=true;that.currentLocation=newLocation;window.location.hash=newLocation;if(that.isIE){that.iframe.src="blank.html?"+newLocation;}
that.ieAtomicLocationChange=false;};window.setTimeout(addImpl,this.currentWaitTime);this.currentWaitTime=this.currentWaitTime+this.waitTime;}},isFirstLoad:function(){return this.firstLoad;},getVersion:function(){return"0.6";},getCurrentLocation:function(){var r=(this.isSafari?this.getSafariState():this.getCurrentHash());return r;},getCurrentHash:function(){var r=window.location.href;var i=r.indexOf("#");return(i>=0?r.substr(i+1):"");},PAGELOADEDSTRING:"DhtmlHistory_pageLoaded",listener:null,waitTime:200,currentWaitTime:0,currentLocation:null,iframe:null,safariHistoryStartPoint:null,safariStack:null,safariLength:null,ignoreLocationChange:null,fireOnNewListener:null,firstLoad:null,ieAtomicLocationChange:null,createIE:function(initialHash){this.waitTime=400;var styles=(historyStorage.debugMode?'width: 800px;height:80px;border:1px solid black;':historyStorage.hideStyles);var iframeID="rshHistoryFrame";var iframeHTML='';document.write(iframeHTML);this.iframe=document.getElementById(iframeID);},createOpera:function(){this.waitTime=400;var imgHTML=';\';)
';document.write(imgHTML);},createSafari:function(){var formID="rshSafariForm";var stackID="rshSafariStack";var lengthID="rshSafariLength";var formStyles=historyStorage.debugMode?historyStorage.showStyles:historyStorage.hideStyles;var inputStyles=(historyStorage.debugMode?'width:800px;height:20px;border:1px solid black;margin:0;padding:0;':historyStorage.hideStyles);var safariHTML='';document.write(safariHTML);this.safariStack=document.getElementById(stackID);this.safariLength=document.getElementById(lengthID);if(!historyStorage.hasKey(this.PAGELOADEDSTRING)){this.safariHistoryStartPoint=history.length;this.safariLength.value=this.safariHistoryStartPoint;}else{this.safariHistoryStartPoint=this.safariLength.value;}},getSafariStack:function(){var r=this.safariStack.value;return historyStorage.fromJSON(r);},getSafariState:function(){var stack=this.getSafariStack();var state=stack[history.length-this.safariHistoryStartPoint-1];return state;},putSafariState:function(newLocation){var stack=this.getSafariStack();stack[history.length-this.safariHistoryStartPoint]=newLocation;this.safariStack.value=historyStorage.toJSON(stack);},fireHistoryEvent:function(newHash){var historyData=historyStorage.get(newHash);this.listener.call(null,newHash,historyData);},checkLocation:function(){if(!this.isIE&&this.ignoreLocationChange){this.ignoreLocationChange=false;return;}
if(!this.isIE&&this.ieAtomicLocationChange){return;}
var hash=this.getCurrentLocation();if(hash==this.currentLocation){return;}
this.ieAtomicLocationChange=true;if(this.isIE&&this.getIframeHash()!=hash){this.iframe.src="blank.html?"+hash;}
else if(this.isIE){return;}
this.currentLocation=hash;this.ieAtomicLocationChange=false;this.fireHistoryEvent(hash);},getIframeHash:function(){var doc=this.iframe.contentWindow.document;var hash=String(doc.location.search);if(hash.length==1&&hash.charAt(0)=="?"){hash="";}
else if(hash.length>=2&&hash.charAt(0)=="?"){hash=hash.substring(1);}
return hash;},removeHash:function(hashValue){var r;if(hashValue===null||hashValue===undefined){r=null;}
else if(hashValue===""){r="";}
else if(hashValue.length==1&&hashValue.charAt(0)=="#"){r="";}
else if(hashValue.length>1&&hashValue.charAt(0)=="#"){r=hashValue.substring(1);}
else{r=hashValue;}
return r;},iframeLoaded:function(newLocation){if(this.ignoreLocationChange){this.ignoreLocationChange=false;return;}
var hash=String(newLocation.search);if(hash.length==1&&hash.charAt(0)=="?"){hash="";}
else if(hash.length>=2&&hash.charAt(0)=="?"){hash=hash.substring(1);}
window.location.hash=hash;this.fireHistoryEvent(hash);}};window.historyStorage={setup:function(options){if(typeof options!=="undefined"){if(options.debugMode){this.debugMode=options.debugMode;}
if(options.toJSON){this.toJSON=options.toJSON;}
if(options.fromJSON){this.fromJSON=options.fromJSON;}}
var formID="rshStorageForm";var textareaID="rshStorageField";var formStyles=this.debugMode?historyStorage.showStyles:historyStorage.hideStyles;var textareaStyles=(historyStorage.debugMode?'width: 800px;height:80px;border:1px solid black;':historyStorage.hideStyles);var textareaHTML='';document.write(textareaHTML);this.storageField=document.getElementById(textareaID);if(typeof window.opera!=="undefined"){this.storageField.focus();}},put:function(key,value){this.assertValidKey(key);if(this.hasKey(key)){this.remove(key);}
this.storageHash[key]=value;this.saveHashTable();},get:function(key){this.assertValidKey(key);this.loadHashTable();var value=this.storageHash[key];if(value===undefined){value=null;}
return value;},remove:function(key){this.assertValidKey(key);this.loadHashTable();delete this.storageHash[key];this.saveHashTable();},reset:function(){this.storageField.value="";this.storageHash={};},hasKey:function(key){this.assertValidKey(key);this.loadHashTable();return(typeof this.storageHash[key]!=="undefined");},isValidKey:function(key){return(typeof key==="string");},showStyles:'border:0;margin:0;padding:0;',hideStyles:'left:-1000px;top:-1000px;width:1px;height:1px;border:0;position:absolute;',debugMode:false,storageHash:{},hashLoaded:false,storageField:null,assertValidKey:function(key){var isValid=this.isValidKey(key);if(!isValid&&this.debugMode){throw new Error("Please provide a valid key for window.historyStorage. Invalid key = "+key+".");}},loadHashTable:function(){if(!this.hashLoaded){var serializedHashTable=this.storageField.value;if(serializedHashTable!==""&&serializedHashTable!==null){this.storageHash=this.fromJSON(serializedHashTable);this.hashLoaded=true;}}},saveHashTable:function(){this.loadHashTable();var serializedHashTable=this.toJSON(this.storageHash);this.storageField.value=serializedHashTable;},toJSON:function(o){return o.toJSONString();},fromJSON:function(s){return s.parseJSON();}};