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;
}
// 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. */
function getPlayer(objectId) {
var objectId = objectId || null;
var player = null; /* AJH, needed? = document.getElementById(getPlayerId()); */
if (browser.ie && objectId != null) {
player = document.getElementById(objectId);
}
if (player == null) {
player = document.getElementsByTagName('object')[0];
}
if (player == null || player.object == null) {
player = document.getElementsByTagName('embed')[0];
}
return player;
}
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;
}
/* 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 && _ie_firstload) {
currentHref = initialHref;
return;
}
if ((!flexAppUrl || flexAppUrl == defaultHash) && _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 {
//getHistoryFrame().src = historyFrameSourcePrefix + getHash();
}
}
}
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;
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)
{
_ie_firstload = true;
getHistoryFrame().src = historyFrameSourcePrefix + def;
window.location.replace("#" + def);
setInterval(checkForUrlChange, 50);
}
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(); });
