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411 lines
14 KiB
JavaScript
411 lines
14 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.back"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.back"] = true;
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dojo.provide("dojo.back");
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/*=====
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dojo.back = {
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// summary: Browser history management resources
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}
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=====*/
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(function(){
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var back = dojo.back;
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// everyone deals with encoding the hash slightly differently
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function getHash(){
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var h = window.location.hash;
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if(h.charAt(0) == "#"){ h = h.substring(1); }
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return dojo.isMozilla ? h : decodeURIComponent(h);
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}
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function setHash(h){
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if(!h){ h = ""; }
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window.location.hash = encodeURIComponent(h);
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historyCounter = history.length;
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}
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// if we're in the test for these methods, expose them on dojo.back. ok'd with alex.
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if(dojo.exists("tests.back-hash")){
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back.getHash = getHash;
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back.setHash = setHash;
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}
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var initialHref = (typeof(window) !== "undefined") ? window.location.href : "";
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var initialHash = (typeof(window) !== "undefined") ? getHash() : "";
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var initialState = null;
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var locationTimer = null;
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var bookmarkAnchor = null;
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var historyIframe = null;
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var forwardStack = [];
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var historyStack = [];
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var moveForward = false;
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var changingUrl = false;
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var historyCounter;
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function handleBackButton(){
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//summary: private method. Do not call this directly.
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//The "current" page is always at the top of the history stack.
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var current = historyStack.pop();
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if(!current){ return; }
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var last = historyStack[historyStack.length-1];
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if(!last && historyStack.length == 0){
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last = initialState;
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}
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if(last){
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if(last.kwArgs["back"]){
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last.kwArgs["back"]();
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}else if(last.kwArgs["backButton"]){
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last.kwArgs["backButton"]();
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}else if(last.kwArgs["handle"]){
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last.kwArgs.handle("back");
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}
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}
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forwardStack.push(current);
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}
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back.goBack = handleBackButton;
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function handleForwardButton(){
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//summary: private method. Do not call this directly.
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var last = forwardStack.pop();
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if(!last){ return; }
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if(last.kwArgs["forward"]){
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last.kwArgs.forward();
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}else if(last.kwArgs["forwardButton"]){
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last.kwArgs.forwardButton();
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}else if(last.kwArgs["handle"]){
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last.kwArgs.handle("forward");
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}
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historyStack.push(last);
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}
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back.goForward = handleForwardButton;
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function createState(url, args, hash){
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//summary: private method. Do not call this directly.
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return {"url": url, "kwArgs": args, "urlHash": hash}; //Object
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}
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function getUrlQuery(url){
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//summary: private method. Do not call this directly.
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var segments = url.split("?");
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if(segments.length < 2){
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return null; //null
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}
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else{
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return segments[1]; //String
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}
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}
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function loadIframeHistory(){
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//summary: private method. Do not call this directly.
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var url = (dojo.config["dojoIframeHistoryUrl"] || dojo.moduleUrl("dojo", "resources/iframe_history.html")) + "?" + (new Date()).getTime();
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moveForward = true;
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if(historyIframe){
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dojo.isWebKit ? historyIframe.location = url : window.frames[historyIframe.name].location = url;
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}else{
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//console.warn("dojo.back: Not initialised. You need to call dojo.back.init() from a <script> block that lives inside the <body> tag.");
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}
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return url; //String
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}
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function checkLocation(){
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if(!changingUrl){
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var hsl = historyStack.length;
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var hash = getHash();
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if((hash === initialHash||window.location.href == initialHref)&&(hsl == 1)){
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// FIXME: could this ever be a forward button?
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// we can't clear it because we still need to check for forwards. Ugg.
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// clearInterval(this.locationTimer);
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handleBackButton();
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return;
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}
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// first check to see if we could have gone forward. We always halt on
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// a no-hash item.
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if(forwardStack.length > 0){
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if(forwardStack[forwardStack.length-1].urlHash === hash){
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handleForwardButton();
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return;
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}
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}
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// ok, that didn't work, try someplace back in the history stack
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if((hsl >= 2)&&(historyStack[hsl-2])){
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if(historyStack[hsl-2].urlHash === hash){
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handleBackButton();
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return;
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}
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}
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if(dojo.isSafari && dojo.isSafari < 3){
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var hisLen = history.length;
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if(hisLen > historyCounter) handleForwardButton();
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else if(hisLen < historyCounter) handleBackButton();
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historyCounter = hisLen;
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}
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}
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};
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back.init = function(){
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//summary: Initializes the undo stack. This must be called from a <script>
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// block that lives inside the <body> tag to prevent bugs on IE.
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// description:
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// Only call this method before the page's DOM is finished loading. Otherwise
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// it will not work. Be careful with xdomain loading or djConfig.debugAtAllCosts scenarios,
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// in order for this method to work, dojo.back will need to be part of a build layer.
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if(dojo.byId("dj_history")){ return; } // prevent reinit
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var src = dojo.config["dojoIframeHistoryUrl"] || dojo.moduleUrl("dojo", "resources/iframe_history.html");
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if (dojo._postLoad) {
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console.error("dojo.back.init() must be called before the DOM has loaded. "
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+ "If using xdomain loading or djConfig.debugAtAllCosts, include dojo.back "
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+ "in a build layer.");
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} else {
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document.write('<iframe style="border:0;width:1px;height:1px;position:absolute;visibility:hidden;bottom:0;right:0;" name="dj_history" id="dj_history" src="' + src + '"></iframe>');
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}
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};
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back.setInitialState = function(/*Object*/args){
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//summary:
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// Sets the state object and back callback for the very first page
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// that is loaded.
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//description:
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// It is recommended that you call this method as part of an event
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// listener that is registered via dojo.addOnLoad().
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//args: Object
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// See the addToHistory() function for the list of valid args properties.
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initialState = createState(initialHref, args, initialHash);
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};
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//FIXME: Make these doc comments not be awful. At least they're not wrong.
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//FIXME: Would like to support arbitrary back/forward jumps. Have to rework iframeLoaded among other things.
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//FIXME: is there a slight race condition in moz using change URL with the timer check and when
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// the hash gets set? I think I have seen a back/forward call in quick succession, but not consistent.
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/*=====
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dojo.__backArgs = function(kwArgs){
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// back: Function?
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// A function to be called when this state is reached via the user
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// clicking the back button.
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// forward: Function?
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// Upon return to this state from the "back, forward" combination
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// of navigation steps, this function will be called. Somewhat
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// analgous to the semantic of an "onRedo" event handler.
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// changeUrl: Boolean?|String?
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// Boolean indicating whether or not to create a unique hash for
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// this state. If a string is passed instead, it is used as the
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// hash.
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}
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=====*/
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back.addToHistory = function(/*dojo.__backArgs*/ args){
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// summary:
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// adds a state object (args) to the history list.
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// description:
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// To support getting back button notifications, the object
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// argument should implement a function called either "back",
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// "backButton", or "handle". The string "back" will be passed as
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// the first and only argument to this callback.
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//
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// To support getting forward button notifications, the object
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// argument should implement a function called either "forward",
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// "forwardButton", or "handle". The string "forward" will be
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// passed as the first and only argument to this callback.
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//
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// If you want the browser location string to change, define "changeUrl" on the object. If the
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// value of "changeUrl" is true, then a unique number will be appended to the URL as a fragment
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// identifier (http://some.domain.com/path#uniquenumber). If it is any other value that does
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// not evaluate to false, that value will be used as the fragment identifier. For example,
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// if changeUrl: 'page1', then the URL will look like: http://some.domain.com/path#page1
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//
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// There are problems with using dojo.back with semantically-named fragment identifiers
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// ("hash values" on an URL). In most browsers it will be hard for dojo.back to know
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// distinguish a back from a forward event in those cases. For back/forward support to
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// work best, the fragment ID should always be a unique value (something using new Date().getTime()
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// for example). If you want to detect hash changes using semantic fragment IDs, then
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// consider using dojo.hash instead (in Dojo 1.4+).
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//
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// example:
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// | dojo.back.addToHistory({
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// | back: function(){ console.log('back pressed'); },
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// | forward: function(){ console.log('forward pressed'); },
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// | changeUrl: true
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// | });
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// BROWSER NOTES:
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// Safari 1.2:
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// back button "works" fine, however it's not possible to actually
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// DETECT that you've moved backwards by inspecting window.location.
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// Unless there is some other means of locating.
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// FIXME: perhaps we can poll on history.length?
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// Safari 2.0.3+ (and probably 1.3.2+):
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// works fine, except when changeUrl is used. When changeUrl is used,
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// Safari jumps all the way back to whatever page was shown before
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// the page that uses dojo.undo.browser support.
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// IE 5.5 SP2:
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// back button behavior is macro. It does not move back to the
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// previous hash value, but to the last full page load. This suggests
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// that the iframe is the correct way to capture the back button in
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// these cases.
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// Don't test this page using local disk for MSIE. MSIE will not create
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// a history list for iframe_history.html if served from a file: URL.
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// The XML served back from the XHR tests will also not be properly
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// created if served from local disk. Serve the test pages from a web
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// server to test in that browser.
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// IE 6.0:
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// same behavior as IE 5.5 SP2
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// Firefox 1.0+:
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// the back button will return us to the previous hash on the same
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// page, thereby not requiring an iframe hack, although we do then
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// need to run a timer to detect inter-page movement.
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//If addToHistory is called, then that means we prune the
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//forward stack -- the user went back, then wanted to
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//start a new forward path.
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forwardStack = [];
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var hash = null;
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var url = null;
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if(!historyIframe){
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if(dojo.config["useXDomain"] && !dojo.config["dojoIframeHistoryUrl"]){
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console.warn("dojo.back: When using cross-domain Dojo builds,"
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+ " please save iframe_history.html to your domain and set djConfig.dojoIframeHistoryUrl"
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+ " to the path on your domain to iframe_history.html");
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}
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historyIframe = window.frames["dj_history"];
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}
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if(!bookmarkAnchor){
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bookmarkAnchor = dojo.create("a", {style: {display: "none"}}, dojo.body());
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}
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if(args["changeUrl"]){
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hash = ""+ ((args["changeUrl"]!==true) ? args["changeUrl"] : (new Date()).getTime());
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//If the current hash matches the new one, just replace the history object with
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//this new one. It doesn't make sense to track different state objects for the same
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//logical URL. This matches the browser behavior of only putting in one history
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//item no matter how many times you click on the same #hash link, at least in Firefox
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//and Safari, and there is no reliable way in those browsers to know if a #hash link
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//has been clicked on multiple times. So making this the standard behavior in all browsers
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//so that dojo.back's behavior is the same in all browsers.
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if(historyStack.length == 0 && initialState.urlHash == hash){
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initialState = createState(url, args, hash);
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return;
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}else if(historyStack.length > 0 && historyStack[historyStack.length - 1].urlHash == hash){
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historyStack[historyStack.length - 1] = createState(url, args, hash);
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return;
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}
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changingUrl = true;
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setTimeout(function() {
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setHash(hash);
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changingUrl = false;
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}, 1);
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bookmarkAnchor.href = hash;
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if(dojo.isIE){
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url = loadIframeHistory();
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var oldCB = args["back"]||args["backButton"]||args["handle"];
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//The function takes handleName as a parameter, in case the
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//callback we are overriding was "handle". In that case,
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//we will need to pass the handle name to handle.
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var tcb = function(handleName){
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if(getHash() != ""){
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setTimeout(function() { setHash(hash); }, 1);
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}
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//Use apply to set "this" to args, and to try to avoid memory leaks.
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oldCB.apply(this, [handleName]);
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};
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//Set interceptor function in the right place.
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if(args["back"]){
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args.back = tcb;
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}else if(args["backButton"]){
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args.backButton = tcb;
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}else if(args["handle"]){
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args.handle = tcb;
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}
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var oldFW = args["forward"]||args["forwardButton"]||args["handle"];
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//The function takes handleName as a parameter, in case the
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//callback we are overriding was "handle". In that case,
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//we will need to pass the handle name to handle.
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var tfw = function(handleName){
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if(getHash() != ""){
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setHash(hash);
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}
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if(oldFW){ // we might not actually have one
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//Use apply to set "this" to args, and to try to avoid memory leaks.
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oldFW.apply(this, [handleName]);
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}
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};
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//Set interceptor function in the right place.
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if(args["forward"]){
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args.forward = tfw;
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}else if(args["forwardButton"]){
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args.forwardButton = tfw;
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}else if(args["handle"]){
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args.handle = tfw;
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}
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}else if(!dojo.isIE){
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// start the timer
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if(!locationTimer){
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locationTimer = setInterval(checkLocation, 200);
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}
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}
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}else{
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url = loadIframeHistory();
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}
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historyStack.push(createState(url, args, hash));
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};
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back._iframeLoaded = function(evt, ifrLoc){
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//summary:
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// private method. Do not call this directly.
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var query = getUrlQuery(ifrLoc.href);
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if(query == null){
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// alert("iframeLoaded");
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// we hit the end of the history, so we should go back
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if(historyStack.length == 1){
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handleBackButton();
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}
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return;
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}
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if(moveForward){
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// we were expecting it, so it's not either a forward or backward movement
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moveForward = false;
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return;
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}
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//Check the back stack first, since it is more likely.
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//Note that only one step back or forward is supported.
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if(historyStack.length >= 2 && query == getUrlQuery(historyStack[historyStack.length-2].url)){
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handleBackButton();
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}else if(forwardStack.length > 0 && query == getUrlQuery(forwardStack[forwardStack.length-1].url)){
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handleForwardButton();
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}
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};
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})();
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}
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