Struts example source code file (browser.js)

This example Struts source code file (browser.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

dojo, dojo, opera, opera, when, when

The Struts browser.js source code

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.undo.browser");
dojo.require("dojo.io.common");
try {
	if ((!djConfig["preventBackButtonFix"]) && (!dojo.hostenv.post_load_)) {
		document.write("<iframe style='border: 0px; width: 1px; height: 1px; position: absolute; bottom: 0px; right: 0px; visibility: visible;' name='djhistory' id='djhistory' src='" + (djConfig["dojoIframeHistoryUrl"] || dojo.hostenv.getBaseScriptUri() + "iframe_history.html") + "'>");
	}
}
catch (e) {
}
if (dojo.render.html.opera) {
	dojo.debug("Opera is not supported with dojo.undo.browser, so back/forward detection will not work.");
}
dojo.undo.browser = {initialHref:(!dj_undef("window")) ? window.location.href : "", initialHash:(!dj_undef("window")) ? window.location.hash : "", moveForward:false, historyStack:[], forwardStack:[], historyIframe:null, bookmarkAnchor:null, locationTimer:null, setInitialState:function (args) {
	this.initialState = this._createState(this.initialHref, args, this.initialHash);
}, addToHistory:function (args) {
	this.forwardStack = [];
	var hash = null;
	var url = null;
	if (!this.historyIframe) {
		if (djConfig["useXDomain"] && !djConfig["dojoIframeHistoryUrl"]) {
			dojo.debug("dojo.undo.browser: When using cross-domain Dojo builds," + " please save iframe_history.html to your domain and set djConfig.dojoIframeHistoryUrl" + " to the path on your domain to iframe_history.html");
		}
		this.historyIframe = window.frames["djhistory"];
	}
	if (!this.bookmarkAnchor) {
		this.bookmarkAnchor = document.createElement("a");
		dojo.body().appendChild(this.bookmarkAnchor);
		this.bookmarkAnchor.style.display = "none";
	}
	if (args["changeUrl"]) {
		hash = "#" + ((args["changeUrl"] !== true) ? args["changeUrl"] : (new Date()).getTime());
		if (this.historyStack.length == 0 && this.initialState.urlHash == hash) {
			this.initialState = this._createState(url, args, hash);
			return;
		} else {
			if (this.historyStack.length > 0 && this.historyStack[this.historyStack.length - 1].urlHash == hash) {
				this.historyStack[this.historyStack.length - 1] = this._createState(url, args, hash);
				return;
			}
		}
		this.changingUrl = true;
		setTimeout("window.location.href = '" + hash + "'; dojo.undo.browser.changingUrl = false;", 1);
		this.bookmarkAnchor.href = hash;
		if (dojo.render.html.ie) {
			url = this._loadIframeHistory();
			var oldCB = args["back"] || args["backButton"] || args["handle"];
			var tcb = function (handleName) {
				if (window.location.hash != "") {
					setTimeout("window.location.href = '" + hash + "';", 1);
				}
				oldCB.apply(this, [handleName]);
			};
			if (args["back"]) {
				args.back = tcb;
			} else {
				if (args["backButton"]) {
					args.backButton = tcb;
				} else {
					if (args["handle"]) {
						args.handle = tcb;
					}
				}
			}
			var oldFW = args["forward"] || args["forwardButton"] || args["handle"];
			var tfw = function (handleName) {
				if (window.location.hash != "") {
					window.location.href = hash;
				}
				if (oldFW) {
					oldFW.apply(this, [handleName]);
				}
			};
			if (args["forward"]) {
				args.forward = tfw;
			} else {
				if (args["forwardButton"]) {
					args.forwardButton = tfw;
				} else {
					if (args["handle"]) {
						args.handle = tfw;
					}
				}
			}
		} else {
			if (dojo.render.html.moz) {
				if (!this.locationTimer) {
					this.locationTimer = setInterval("dojo.undo.browser.checkLocation();", 200);
				}
			}
		}
	} else {
		url = this._loadIframeHistory();
	}
	this.historyStack.push(this._createState(url, args, hash));
}, checkLocation:function () {
	if (!this.changingUrl) {
		var hsl = this.historyStack.length;
		if ((window.location.hash == this.initialHash || window.location.href == this.initialHref) && (hsl == 1)) {
			this.handleBackButton();
			return;
		}
		if (this.forwardStack.length > 0) {
			if (this.forwardStack[this.forwardStack.length - 1].urlHash == window.location.hash) {
				this.handleForwardButton();
				return;
			}
		}
		if ((hsl >= 2) && (this.historyStack[hsl - 2])) {
			if (this.historyStack[hsl - 2].urlHash == window.location.hash) {
				this.handleBackButton();
				return;
			}
		}
	}
}, iframeLoaded:function (evt, ifrLoc) {
	if (!dojo.render.html.opera) {
		var query = this._getUrlQuery(ifrLoc.href);
		if (query == null) {
			if (this.historyStack.length == 1) {
				this.handleBackButton();
			}
			return;
		}
		if (this.moveForward) {
			this.moveForward = false;
			return;
		}
		if (this.historyStack.length >= 2 && query == this._getUrlQuery(this.historyStack[this.historyStack.length - 2].url)) {
			this.handleBackButton();
		} else {
			if (this.forwardStack.length > 0 && query == this._getUrlQuery(this.forwardStack[this.forwardStack.length - 1].url)) {
				this.handleForwardButton();
			}
		}
	}
}, handleBackButton:function () {
	var current = this.historyStack.pop();
	if (!current) {
		return;
	}
	var last = this.historyStack[this.historyStack.length - 1];
	if (!last && this.historyStack.length == 0) {
		last = this.initialState;
	}
	if (last) {
		if (last.kwArgs["back"]) {
			last.kwArgs["back"]();
		} else {
			if (last.kwArgs["backButton"]) {
				last.kwArgs["backButton"]();
			} else {
				if (last.kwArgs["handle"]) {
					last.kwArgs.handle("back");
				}
			}
		}
	}
	this.forwardStack.push(current);
}, handleForwardButton:function () {
	var last = this.forwardStack.pop();
	if (!last) {
		return;
	}
	if (last.kwArgs["forward"]) {
		last.kwArgs.forward();
	} else {
		if (last.kwArgs["forwardButton"]) {
			last.kwArgs.forwardButton();
		} else {
			if (last.kwArgs["handle"]) {
				last.kwArgs.handle("forward");
			}
		}
	}
	this.historyStack.push(last);
}, _createState:function (url, args, hash) {
	return {"url":url, "kwArgs":args, "urlHash":hash};
}, _getUrlQuery:function (url) {
	var segments = url.split("?");
	if (segments.length < 2) {
		return null;
	} else {
		return segments[1];
	}
}, _loadIframeHistory:function () {
	var url = (djConfig["dojoIframeHistoryUrl"] || dojo.hostenv.getBaseScriptUri() + "iframe_history.html") + "?" + (new Date()).getTime();
	this.moveForward = true;
	dojo.io.setIFrameSrc(this.historyIframe, url, false);
	return url;
}};