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240 lines
8.1 KiB
JavaScript
240 lines
8.1 KiB
JavaScript
/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo.hash"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.hash"] = true;
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dojo.provide("dojo.hash");
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//TODOC: where does this go?
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// summary:
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// Methods for monitoring and updating the hash in the browser URL.
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//
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// example:
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// dojo.subscribe("/dojo/hashchange", context, callback);
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//
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// function callback (hashValue){
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// // do something based on the hash value.
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// }
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(function(){
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dojo.hash = function(/* String? */ hash, /* Boolean? */ replace){
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// summary:
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// Gets or sets the hash string.
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// description:
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// Handles getting and setting of location.hash.
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// - If no arguments are passed, acts as a getter.
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// - If a string is passed, acts as a setter.
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// hash:
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// String: the hash is set - #string.
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// replace:
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// Boolean: If true, updates the hash value in the current history
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// state instead of creating a new history state.
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// returns:
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// when used as a getter, returns the current hash string.
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// when used as a setter, returns the new hash string.
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// getter
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if(!arguments.length){
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return _getHash();
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}
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// setter
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if(hash.charAt(0) == "#"){
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hash = hash.substring(1);
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}
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if(replace){
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_replace(hash);
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}else{
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location.href = "#" + hash;
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}
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return hash; // String
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}
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// Global vars
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var _recentHash = null,
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_ieUriMonitor = null,
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_pollFrequency = dojo.config.hashPollFrequency || 100;
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//Internal functions
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function _getSegment(str, delimiter){
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var i = str.indexOf(delimiter);
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return (i >= 0) ? str.substring(i+1) : "";
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}
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function _getHash(){
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return _getSegment(location.href, "#");
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}
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function _dispatchEvent(){
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dojo.publish("/dojo/hashchange", [_getHash()]);
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}
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function _pollLocation(){
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if(_getHash() === _recentHash){
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return;
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}
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_recentHash = _getHash();
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_dispatchEvent();
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}
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function _replace(hash){
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if(_ieUriMonitor){
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if(_ieUriMonitor.isTransitioning()){
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setTimeout(dojo.hitch(null,_replace,hash), _pollFrequency);
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return;
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}
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var href = _ieUriMonitor.iframe.location.href;
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var index = href.indexOf('?');
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// main frame will detect and update itself
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_ieUriMonitor.iframe.location.replace(href.substring(0, index) + "?" + hash);
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return;
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}
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location.replace("#"+hash);
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_pollLocation();
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}
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function IEUriMonitor(){
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// summary:
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// Determine if the browser's URI has changed or if the user has pressed the
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// back or forward button. If so, call _dispatchEvent.
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//
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// description:
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// IE doesn't add changes to the URI's hash into the history unless the hash
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// value corresponds to an actual named anchor in the document. To get around
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// this IE difference, we use a background IFrame to maintain a back-forward
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// history, by updating the IFrame's query string to correspond to the
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// value of the main browser location's hash value.
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//
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// E.g. if the value of the browser window's location changes to
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//
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// #action=someAction
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//
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// ... then we'd update the IFrame's source to:
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//
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// ?action=someAction
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//
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// This design leads to a somewhat complex state machine, which is
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// described below:
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//
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// s1: Stable state - neither the window's location has changed nor
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// has the IFrame's location. Note that this is the 99.9% case, so
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// we optimize for it.
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// Transitions: s1, s2, s3
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// s2: Window's location changed - when a user clicks a hyperlink or
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// code programmatically changes the window's URI.
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// Transitions: s4
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// s3: Iframe's location changed as a result of user pressing back or
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// forward - when the user presses back or forward, the location of
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// the background's iframe changes to the previous or next value in
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// its history.
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// Transitions: s1
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// s4: IEUriMonitor has programmatically changed the location of the
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// background iframe, but it's location hasn't yet changed. In this
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// case we do nothing because we need to wait for the iframe's
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// location to reflect its actual state.
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// Transitions: s4, s5
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// s5: IEUriMonitor has programmatically changed the location of the
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// background iframe, and the iframe's location has caught up with
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// reality. In this case we need to transition to s1.
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// Transitions: s1
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//
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// The hashchange event is always dispatched on the transition back to s1.
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//
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// create and append iframe
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var ifr = document.createElement("iframe"),
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IFRAME_ID = "dojo-hash-iframe",
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ifrSrc = dojo.config.dojoBlankHtmlUrl || dojo.moduleUrl("dojo", "resources/blank.html");
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ifr.id = IFRAME_ID;
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ifr.src = ifrSrc + "?" + _getHash();
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ifr.style.display = "none";
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document.body.appendChild(ifr);
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this.iframe = dojo.global[IFRAME_ID];
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var recentIframeQuery, transitioning, expectedIFrameQuery, docTitle, ifrOffline,
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iframeLoc = this.iframe.location;
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function resetState(){
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_recentHash = _getHash();
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recentIframeQuery = ifrOffline ? _recentHash : _getSegment(iframeLoc.href, "?");
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transitioning = false;
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expectedIFrameQuery = null;
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}
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this.isTransitioning = function(){
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return transitioning;
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}
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this.pollLocation = function(){
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if(!ifrOffline) {
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try{
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//see if we can access the iframe's location without a permission denied error
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var iframeSearch = _getSegment(iframeLoc.href, "?");
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//good, the iframe is same origin (no thrown exception)
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if(document.title != docTitle){ //sync title of main window with title of iframe.
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docTitle = this.iframe.document.title = document.title;
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}
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}catch(e){
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//permission denied - server cannot be reached.
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ifrOffline = true;
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console.error("dojo.hash: Error adding history entry. Server unreachable.");
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}
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}
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var hash = _getHash();
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if(transitioning && _recentHash === hash){
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// we're in an iframe transition (s4 or s5)
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if(ifrOffline || iframeSearch === expectedIFrameQuery){
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// s5 (iframe caught up to main window or iframe offline), transition back to s1
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resetState();
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_dispatchEvent();
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}else{
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// s4 (waiting for iframe to catch up to main window)
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setTimeout(dojo.hitch(this,this.pollLocation),0);
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return;
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}
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}else if(_recentHash === hash && (ifrOffline || recentIframeQuery === iframeSearch)){
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// we're in stable state (s1, iframe query == main window hash), do nothing
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}else{
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// the user has initiated a URL change somehow.
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// sync iframe query <-> main window hash
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if(_recentHash !== hash){
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// s2 (main window location changed), set iframe url and transition to s4
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_recentHash = hash;
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transitioning = true;
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expectedIFrameQuery = hash;
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ifr.src = ifrSrc + "?" + expectedIFrameQuery;
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ifrOffline = false; //we're updating the iframe src - set offline to false so we can check again on next poll.
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setTimeout(dojo.hitch(this,this.pollLocation),0); //yielded transition to s4 while iframe reloads.
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return;
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}else if(!ifrOffline){
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// s3 (iframe location changed via back/forward button), set main window url and transition to s1.
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location.href = "#" + iframeLoc.search.substring(1);
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resetState();
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_dispatchEvent();
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}
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}
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setTimeout(dojo.hitch(this,this.pollLocation), _pollFrequency);
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}
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resetState(); // initialize state (transition to s1)
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setTimeout(dojo.hitch(this,this.pollLocation), _pollFrequency);
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}
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dojo.addOnLoad(function(){
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if("onhashchange" in dojo.global && (!dojo.isIE || (dojo.isIE >= 8 && document.compatMode != "BackCompat"))){ //need this IE browser test because "onhashchange" exists in IE8 in IE7 mode
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dojo.connect(dojo.global,"onhashchange",_dispatchEvent);
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}else{
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if(document.addEventListener){ // Non-IE
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_recentHash = _getHash();
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setInterval(_pollLocation, _pollFrequency); //Poll the window location for changes
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}else if(document.attachEvent){ // IE7-
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//Use hidden iframe in versions of IE that don't have onhashchange event
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_ieUriMonitor = new IEUriMonitor();
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}
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// else non-supported browser, do nothing.
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}
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});
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})();
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}
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