hi.

i have javscript file for history management.IT is not supported by chrome when i am trying to navigate to back page with backbutton in the browser.I can see the url change but it doesnt go to preceeding page.

BrowserHistoryUtils = { addEvent: function(elm, evType, fn, useCapture) { useCapture = useCapture || false; if (elm.addEventListener) { elm.addEventListener(evType, fn, useCapture); return true; } else if (elm.attachEvent) { var r = elm.attachEvent('on' + evType, fn); return r; } else { elm['on' + evType] = fn; } } }

BrowserHistory = (function() { // type of browser var browser = { ie: false, firefox: false, safari: false, opera: false, version: -1 };

// if setDefaultURL has been called, our first clue
// that the SWF is ready and listening
//var swfReady = false;

// the URL we'll send to the SWF once it is ready
//var pendingURL = '';

// Default app state URL to use when no fragment ID present
var defaultHash = '';

// Last-known app state URL
var currentHref = document.location.href;

// Initial URL (used only by IE)
var initialHref = document.location.href;

// Initial URL (used only by IE)
var initialHash = document.location.hash;

// History frame source URL prefix (used only by IE)
var historyFrameSourcePrefix = 'history/historyFrame.html?';

// History maintenance (used only by Safari)
var currentHistoryLength = -1;

var historyHash = [];

var initialState = createState(initialHref, initialHref + '#' + initialHash, initialHash);

var backStack = [];
var forwardStack = [];

var currentObjectId = null;

//UserAgent detection
var useragent = navigator.userAgent.toLowerCase();

if (useragent.indexOf("opera") != -1) {
    browser.opera = true;
} else if (useragent.indexOf("msie") != -1) {
    browser.ie = true;
    browser.version = parseFloat(useragent.substring(useragent.indexOf('msie') + 4));
} else if (useragent.indexOf("safari") != -1) {
    browser.safari = true;
    browser.version = parseFloat(useragent.substring(useragent.indexOf('safari') + 7));
} else if (useragent.indexOf("gecko") != -1) {
    browser.firefox = true;
}

if (browser.ie == true && browser.version == 7) {
    window["_ie_firstload"] = false;
}

// Accessor functions for obtaining specific elements of the page.
function getHistoryFrame()
{
    return document.getElementById('ie_historyFrame');
}

function getAnchorElement()
{
    return document.getElementById('firefox_anchorDiv');
}

function getFormElement()
{
    return document.getElementById('safari_formDiv');
}

function getRememberElement()
{
    return document.getElementById("safari_remember_field");
}

// Get the Flash player object for performing ExternalInterface callbacks.
// Updated for changes to SWFObject2.
function getPlayer(id) {
    if (id && document.getElementById(id)) {
        var r = document.getElementById(id);
        if (typeof r.SetVariable != "undefined") {
            return r;
        }
        else {
            var o = r.getElementsByTagName("object");
            var e = r.getElementsByTagName("embed");
            if (o.length > 0 && typeof o[0].SetVariable != "undefined") {
                return o[0];
            }
            else if (e.length > 0 && typeof e[0].SetVariable != "undefined") {
                return e[0];
            }
        }
    }
    else {
        var o = document.getElementsByTagName("object");
        var e = document.getElementsByTagName("embed");
        if (e.length > 0 && typeof e[0].SetVariable != "undefined") {
            return e[0];
        }
        else if (o.length > 0 && typeof o[0].SetVariable != "undefined") {
            return o[0];
        }
        else if (o.length > 1 && typeof o[1].SetVariable != "undefined") {
            return o[1];
        }
    }
    return undefined;
}

function getPlayers() {
    var players = [];
    if (players.length == 0) {
        var tmp = document.getElementsByTagName('object');
        players = tmp;
    }

    if (players.length == 0 || players[0].object == null) {
        var tmp = document.getElementsByTagName('embed');
        players = tmp;
    }
    return players;
}

function getIframeHash() {
    var doc = getHistoryFrame().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;
}

/* Get the current location hash excluding the '#' symbol. */
function getHash() {
   // It would be nice if we could use document.location.hash here,
   // but it's faulty sometimes.
   var idx = document.location.href.indexOf('#');
   return (idx >= 0) ? document.location.href.substr(idx+1) : '';
}

/* Get the current location hash excluding the '#' symbol. */
function setHash(hash) {
   // It would be nice if we could use document.location.hash here,
   // but it's faulty sometimes.
   if (hash == '') hash = '#'
   document.location.hash = hash;
}

function createState(baseUrl, newUrl, flexAppUrl) {
    return { 'baseUrl': baseUrl, 'newUrl': newUrl, 'flexAppUrl': flexAppUrl, 'title': null };
}

/* Add a history entry to the browser.
 *   baseUrl: the portion of the location prior to the '#'
 *   newUrl: the entire new URL, including '#' and following fragment
 *   flexAppUrl: the portion of the location following the '#' only
 */
function addHistoryEntry(baseUrl, newUrl, flexAppUrl) {

    //delete all the history entries
    forwardStack = [];

    if (browser.ie) {
        //Check to see if we are being asked to do a navigate for the first
        //history entry, and if so ignore, because it's coming from the creation
        //of the history iframe
        if (flexAppUrl == defaultHash && document.location.href == initialHref && window['_ie_firstload']) {
            currentHref = initialHref;
            return;
        }
        if ((!flexAppUrl || flexAppUrl == defaultHash) && window['_ie_firstload']) {
            newUrl = baseUrl + '#' + defaultHash;
            flexAppUrl = defaultHash;
        } else {
            // for IE, tell the history frame to go somewhere without a '#'
            // in order to get this entry into the browser history.
            getHistoryFrame().src = historyFrameSourcePrefix + flexAppUrl;
        }
        setHash(flexAppUrl);
    } else {

        //ADR
        if (backStack.length == 0 && initialState.flexAppUrl == flexAppUrl) {
            initialState = createState(baseUrl, newUrl, flexAppUrl);
        } else if(backStack.length > 0 && backStack[backStack.length - 1].flexAppUrl == flexAppUrl) {
            backStack[backStack.length - 1] = createState(baseUrl, newUrl, flexAppUrl);
        }

        if (browser.safari) {
            // for Safari, submit a form whose action points to the desired URL
            if (browser.version <= 419.3) {
                var file = window.location.pathname.toString();
                file = file.substring(file.lastIndexOf("/")+1);
                getFormElement().innerHTML = '<form name="historyForm" action="'+file+'#' + flexAppUrl + '" method="GET"></form>';
                //get the current elements and add them to the form
                var qs = window.location.search.substring(1);
                var qs_arr = qs.split("&");
                for (var i = 0; i < qs_arr.length; i++) {
                    var tmp = qs_arr[i].split("=");
                    var elem = document.createElement("input");
                    elem.type = "hidden";
                    elem.name = tmp[0];
                    elem.value = tmp[1];
                    document.forms.historyForm.appendChild(elem);
                }
                document.forms.historyForm.submit();
            } else {
                top.location.hash = flexAppUrl;
            }
            // We also have to maintain the history by hand for Safari
            historyHash[history.length] = flexAppUrl;
            _storeStates();
        } else {
            // Otherwise, write an anchor into the page and tell the browser to go there
            addAnchor(flexAppUrl);
            setHash(flexAppUrl);
        }
    }
    backStack.push(createState(baseUrl, newUrl, flexAppUrl));
}

function _storeStates() {
    if (browser.safari) {
        getRememberElement().value = historyHash.join(",");
    }
}

function handleBackButton() {
    //The "current" page is always at the top of the history stack.
    var current = backStack.pop();
    if (!current) { return; }
    var last = backStack[backStack.length - 1];
    if (!last && backStack.length == 0){
        last = initialState;
    }
    forwardStack.push(current);
}

function handleForwardButton() {
    //summary: private method. Do not call this directly.

    var last = forwardStack.pop();
    if (!last) { return; }
    backStack.push(last);
}

function handleArbitraryUrl() {
    //delete all the history entries
    forwardStack = [];
}

/* Called periodically to poll to see if we need to detect navigation that has occurred */
function checkForUrlChange() {

    if (browser.ie) {
        if (currentHref != document.location.href && currentHref + '#' != document.location.href) {
            //This occurs when the user has navigated to a specific URL
            //within the app, and didn't use browser back/forward
            //IE seems to have a bug where it stops updating the URL it
            //shows the end-user at this point, but programatically it
            //appears to be correct.  Do a full app reload to get around
            //this issue.
            if (browser.version < 7) {
                currentHref = document.location.href;
                document.location.reload();
            } else {
                if (getHash() != getIframeHash()) {
                    // this.iframe.src = this.blankURL + hash;
                    var sourceToSet = historyFrameSourcePrefix + getHash();
                    getHistoryFrame().src = sourceToSet;
                }
            }
        }
    }

    if (browser.safari) {
        // For Safari, we have to check to see if history.length changed.
        if (currentHistoryLength >= 0 && history.length != currentHistoryLength) {
            //alert("did change: " + history.length + ", " + historyHash.length + "|" + historyHash[history.length] + "|>" + historyHash.join("|"));
            // If it did change, then we have to look the old state up
            // in our hand-maintained array since document.location.hash
            // won't have changed, then call back into BrowserManager.
            currentHistoryLength = history.length;
            var flexAppUrl = historyHash[currentHistoryLength];
            if (flexAppUrl == '') {
                //flexAppUrl = defaultHash;
            }
            //ADR: to fix multiple
            if (typeof BrowserHistory_multiple != "undefined" && BrowserHistory_multiple == true) {
                var pl = getPlayers();
                for (var i = 0; i < pl.length; i++) {
                    pl[i].browserURLChange(flexAppUrl);
                }
            } else {
                getPlayer().browserURLChange(flexAppUrl);
            }
            _storeStates();
        }
    }
    if (browser.firefox) {
        if (currentHref != document.location.href) {
            var bsl = backStack.length;

            var urlActions = {
                back: false, 
                forward: false, 
                set: false
            }

            if ((window.location.hash == initialHash || window.location.href == initialHref) && (bsl == 1)) {
                urlActions.back = true;
                // FIXME: could this ever be a forward button?
                // we can't clear it because we still need to check for forwards. Ugg.
                // clearInterval(this.locationTimer);
                handleBackButton();
            }

            // first check to see if we could have gone forward. We always halt on
            // a no-hash item.
            if (forwardStack.length > 0) {
                if (forwardStack[forwardStack.length-1].flexAppUrl == getHash()) {
                    urlActions.forward = true;
                    handleForwardButton();
                }
            }

            // ok, that didn't work, try someplace back in the history stack
            if ((bsl >= 2) && (backStack[bsl - 2])) {
                if (backStack[bsl - 2].flexAppUrl == getHash()) {
                    urlActions.back = true;
                    handleBackButton();
                }
            }

            if (!urlActions.back && !urlActions.forward) {
                var foundInStacks = {
                    back: -1, 
                    forward: -1
                }

                for (var i = 0; i < backStack.length; i++) {
                    if (backStack[i].flexAppUrl == getHash() && i != (bsl - 2)) {
                        arbitraryUrl = true;
                        foundInStacks.back = i;
                    }
                }
                for (var i = 0; i < forwardStack.length; i++) {
                    if (forwardStack[i].flexAppUrl == getHash() && i != (bsl - 2)) {
                        arbitraryUrl = true;
                        foundInStacks.forward = i;
                    }
                }
                handleArbitraryUrl();
            }

            // Firefox changed; do a callback into BrowserManager to tell it.
            currentHref = document.location.href;
            var flexAppUrl = getHash();
            if (flexAppUrl == '') {
                //flexAppUrl = defaultHash;
            }
            //ADR: to fix multiple
            if (typeof BrowserHistory_multiple != "undefined" && BrowserHistory_multiple == true) {
                var pl = getPlayers();
                for (var i = 0; i < pl.length; i++) {
                    pl[i].browserURLChange(flexAppUrl);
                }
            } else {
                getPlayer().browserURLChange(flexAppUrl);
            }
        }
    }
    //setTimeout(checkForUrlChange, 50);
}

/* Write an anchor into the page to legitimize it as a URL for Firefox et al. */
function addAnchor(flexAppUrl)
{
   if (document.getElementsByName(flexAppUrl).length == 0) {
       getAnchorElement().innerHTML += "<a name='" + flexAppUrl + "'>" + flexAppUrl + "</a>";
   }
}

var _initialize = function () {
    if (browser.ie)
    {
        var scripts = document.getElementsByTagName('script');
        for (var i = 0, s; s = scripts[i]; i++) {
            if (s.src.indexOf("history.js") > -1) {
                var iframe_location = (new String(s.src)).replace("history.js", "historyFrame.html");
            }
        }
        historyFrameSourcePrefix = iframe_location + "?";
        var src = historyFrameSourcePrefix;

        var iframe = document.createElement("iframe");
        iframe.id = 'ie_historyFrame';
        iframe.name = 'ie_historyFrame';
        //iframe.src = historyFrameSourcePrefix;
        try {
            document.body.appendChild(iframe);
        } catch(e) {
            setTimeout(function() {
                document.body.appendChild(iframe);
            }, 0);
        }
    }

    if (browser.safari)
    {
        var rememberDiv = document.createElement("div");
        rememberDiv.id = 'safari_rememberDiv';
        document.body.appendChild(rememberDiv);
        rememberDiv.innerHTML = '<input type="text" id="safari_remember_field" style="width: 500px;">';

        var formDiv = document.createElement("div");
        formDiv.id = 'safari_formDiv';
        document.body.appendChild(formDiv);

        var reloader_content = document.createElement('div');
        reloader_content.id = 'safarireloader';
        var scripts = document.getElementsByTagName('script');
        for (var i = 0, s; s = scripts[i]; i++) {
            if (s.src.indexOf("history.js") > -1) {
                html = (new String(s.src)).replace(".js", ".html");
            }
        }
        reloader_content.innerHTML = '<iframe id="safarireloader-iframe" src="about:blank" frameborder="no" scrolling="no"></iframe>';
        document.body.appendChild(reloader_content);
        reloader_content.style.position = 'absolute';
        reloader_content.style.left = reloader_content.style.top = '-9999px';
        iframe = reloader_content.getElementsByTagName('iframe')[0];

        if (document.getElementById("safari_remember_field").value != "" ) {
            historyHash = document.getElementById("safari_remember_field").value.split(",");
        }

    }

    if (browser.firefox)
    {
        var anchorDiv = document.createElement("div");
        anchorDiv.id = 'firefox_anchorDiv';
        document.body.appendChild(anchorDiv);
    }

    //setTimeout(checkForUrlChange, 50);
}

return {
    historyHash: historyHash, 
    backStack: function() { return backStack; }, 
    forwardStack: function() { return forwardStack }, 
    getPlayer: getPlayer, 
    initialize: function(src) {
        _initialize(src);
    }, 
    setURL: function(url) {
        document.location.href = url;
    }, 
    getURL: function() {
        return document.location.href;
    }, 
    getTitle: function() {
        return document.title;
    }, 
    setTitle: function(title) {
        try {
            backStack[backStack.length - 1].title = title;
        } catch(e) { }
        //if on safari, set the title to be the empty string. 
        if (browser.safari) {
            if (title == "") {
                try {
                var tmp = window.location.href.toString();
                title = tmp.substring((tmp.lastIndexOf("/")+1), tmp.lastIndexOf("#"));
                } catch(e) {
                    title = "";
                }
            }
        }
        document.title = title;
    }, 
    setDefaultURL: function(def)
    {
        defaultHash = def;
        def = getHash();
        //trailing ? is important else an extra frame gets added to the history
        //when navigating back to the first page.  Alternatively could check
        //in history frame navigation to compare # and ?.
        if (browser.ie)
        {
            window['_ie_firstload'] = true;
            var sourceToSet = historyFrameSourcePrefix + def;
            var func = function() {
                getHistoryFrame().src = sourceToSet;
                window.location.replace("#" + def);
                setInterval(checkForUrlChange, 50);
            }
            try {
                func();
            } catch(e) {
                window.setTimeout(function() { func(); }, 0);
            }
        }

        if (browser.safari)
        {
            currentHistoryLength = history.length;
            if (historyHash.length == 0) {
                historyHash[currentHistoryLength] = def;
                var newloc = "#" + def;
                window.location.replace(newloc);
            } else {
                //alert(historyHash[historyHash.length-1]);
            }
            //setHash(def);
            setInterval(checkForUrlChange, 50);
        }


        if (browser.firefox || browser.opera)
        {
            var reg = new RegExp("#" + def + "$");
            if (window.location.toString().match(reg)) {
            } else {
                var newloc ="#" + def;
                window.location.replace(newloc);
            }
            setInterval(checkForUrlChange, 50);
            //setHash(def);
        }

    }, 

    /* Set the current browser URL; called from inside BrowserManager to propagate
     * the application state out to the container.
     */
    setBrowserURL: function(flexAppUrl, objectId) {
        if (browser.ie && typeof objectId != "undefined") {
            currentObjectId = objectId;
        }
       //fromIframe = fromIframe || false;
       //fromFlex = fromFlex || false;
       //alert("setBrowserURL: " + flexAppUrl);
       //flexAppUrl = (flexAppUrl == "") ? defaultHash : flexAppUrl ;

       var pos = document.location.href.indexOf('#');
       var baseUrl = pos != -1 ? document.location.href.substr(0, pos) : document.location.href;
       var newUrl = baseUrl + '#' + flexAppUrl;

       if (document.location.href != newUrl && document.location.href + '#' != newUrl) {
           currentHref = newUrl;
           addHistoryEntry(baseUrl, newUrl, flexAppUrl);
           currentHistoryLength = history.length;
       }

       return false;
    }, 

    browserURLChange: function(flexAppUrl) {
        var objectId = null;
        if (browser.ie && currentObjectId != null) {
            objectId = currentObjectId;
        }
        pendingURL = '';

        if (typeof BrowserHistory_multiple != "undefined" && BrowserHistory_multiple == true) {
            var pl = getPlayers();
            for (var i = 0; i < pl.length; i++) {
                try {
                    pl[i].browserURLChange(flexAppUrl);
                } catch(e) { }
            }
        } else {
            try {
                getPlayer(objectId).browserURLChange(flexAppUrl);
            } catch(e) { }
        }

        currentObjectId = null;
    }

}

})();

// Initialization

// Automated unit testing and other diagnostics

function setURL(url) { document.location.href = url; }

function backButton() { history.back(); }

function forwardButton() { history.forward(); }

function goForwardOrBackInHistory(step) { history.go(step); }

//BrowserHistoryUtils.addEvent(window, "load", function() { BrowserHistory.initialize(); }); (function(i) { var u =navigator.userAgent;var e=/*@cc_on!@*/false; var st = setTimeout; if(/webkit/i.test(u)){ st(function(){ var dr=document.readyState; if(dr=="loaded"||dr=="complete"){i()} else{st(arguments.callee,10);}},10); } else if((/mozilla/i.test(u)&&!/(compati)/.test(u)) || (/opera/i.test(u))){ document.addEventListener("DOMContentLoaded",i,false); } else if(e){ (function(){ var t=document.createElement('doc:rdy'); try{t.doScroll('left'); i();t=null; }catch(e){st(arguments.callee,0);}})(); } else{ window.onload=i; } })( function() {BrowserHistory.initialize();} );