/*	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.io.ScriptSrcIO");dojo.require("dojo.io.BrowserIO");dojo.require("dojo.undo.browser");//FIXME: should constantParams be JS object?//FIXME: check dojo.io calls. Can we move the BrowserIO defined calls somewhere//       else so that we don't depend on BrowserIO at all? The dependent calls//       have to do with dealing with forms and making query params from JS object./** * See test_ScriptSrcIO.html for usage information. * Notes: * - The watchInFlight timer is set to 100 ms instead of 10ms (which is what BrowserIO.js uses). */dojo.io.ScriptSrcTransport = new function(){	this.preventCache = false; // if this is true, we'll always force GET requests to not cache	this.maxUrlLength = 1000; //Used to calculate if script request should be multipart.	this.inFlightTimer = null;	this.DsrStatusCodes = {		Continue: 100,		Ok: 200,		Error: 500	};	this.startWatchingInFlight = function(){		//summary: Internal method to start the process of watching for in-flight requests.		if(!this.inFlightTimer){			this.inFlightTimer = setInterval("dojo.io.ScriptSrcTransport.watchInFlight();", 100);		}	}	this.watchInFlight = function(){		//summary: Internal method to watch for in-flight requests.		var totalCount = 0;		var doneCount = 0;		for(var param in this._state){			totalCount++;			var currentState = this._state[param];			if(currentState.isDone){				doneCount++;				delete this._state[param];			}else if(!currentState.isFinishing){				var listener = currentState.kwArgs;				try{					if(currentState.checkString && eval("typeof(" + currentState.checkString + ") != 'undefined'")){						currentState.isFinishing = true;						this._finish(currentState, "load");						doneCount++;						delete this._state[param];					}else if(listener.timeoutSeconds && listener.timeout){						if(currentState.startTime + (listener.timeoutSeconds * 1000) < (new Date()).getTime()){							currentState.isFinishing = true;							this._finish(currentState, "timeout");							doneCount++;							delete this._state[param];						}					}else if(!listener.timeoutSeconds){						//Increment the done count if no timeout is specified, so						//that we turn off the timer if all that is left in the state						//list are things we can't clean up because they fail without						//getting a callback.						doneCount++;					}				}catch(e){					currentState.isFinishing = true;					this._finish(currentState, "error", {status: this.DsrStatusCodes.Error, response: e});				}			}		}			if(doneCount >= totalCount){			clearInterval(this.inFlightTimer);			this.inFlightTimer = null;		}	}	this.canHandle = function(/*dojo.io.Request*/kwArgs){		//summary: Tells dojo.io.bind() if this is a good transport to		//use for the particular type of request. This type of transport can only		//handle responses that are JavaScript or JSON that is passed to a JavaScript		//callback. It can only do asynchronous binds, is limited to GET HTTP method		//requests, and cannot handle formNodes. However, it has the advantage of being		//able to do cross-domain requests.		return dojo.lang.inArray(["text/javascript", "text/json", "application/json"], (kwArgs["mimetype"].toLowerCase()))			&& (kwArgs["method"].toLowerCase() == "get")			&& !(kwArgs["formNode"] && dojo.io.formHasFile(kwArgs["formNode"]))			&& (!kwArgs["sync"] || kwArgs["sync"] == false)			&& !kwArgs["file"]			&& !kwArgs["multipart"];	}	this.removeScripts = function(){		//summary: Removes any script tags from the DOM that may have been added by ScriptSrcTransport.		//description: Be careful though, by removing them from the script, you may invalidate some		//script objects that were defined by the js file that was pulled in as the		//src of the script tag. Test carefully if you decide to call this method.		//In MSIE 6 (and probably 5.x), if you remove the script element while 		//part of the response script is still executing, the browser might crash.		var scripts = document.getElementsByTagName("script");		for(var i = 0; scripts && i < scripts.length; i++){			var scriptTag = scripts[i];			if(scriptTag.className == "ScriptSrcTransport"){				var parent = scriptTag.parentNode;				parent.removeChild(scriptTag);				i--; //Set the index back one since we removed an item.			}		}	}	this.bind = function(/*dojo.io.Request*/kwArgs){		//summary: function that sends the request to the server.		//description: See the Dojo Book page on this transport for a full		//description of supported kwArgs properties and usage:		//http://manual.dojotoolkit.org/WikiHome/DojoDotBook/Book25		//START duplication from BrowserIO.js (some changes made)		var url = kwArgs.url;		var query = "";				if(kwArgs["formNode"]){			var ta = kwArgs.formNode.getAttribute("action");			if((ta)&&(!kwArgs["url"])){ url = ta; }			var tp = kwArgs.formNode.getAttribute("method");			if((tp)&&(!kwArgs["method"])){ kwArgs.method = tp; }			query += dojo.io.encodeForm(kwArgs.formNode, kwArgs.encoding, kwArgs["formFilter"]);		}		if(url.indexOf("#") > -1) {			dojo.debug("Warning: dojo.io.bind: stripping hash values from url:", url);			url = url.split("#")[0];		}		//Break off the domain/path of the URL.		var urlParts = url.split("?");		if(urlParts && urlParts.length == 2){			url = urlParts[0];			query += (query ? "&" : "") + urlParts[1];		}		if(kwArgs["backButton"] || kwArgs["back"] || kwArgs["changeUrl"]){			dojo.undo.browser.addToHistory(kwArgs);		}		//Create an ID for the request.		var id = kwArgs["apiId"] ? kwArgs["apiId"] : "id" + this._counter++;		//Fill out any other content pieces.		var content = kwArgs["content"];		var jsonpName = kwArgs.jsonParamName;		if(kwArgs.sendTransport || jsonpName) {			if (!content){				content = {};			}			if(kwArgs.sendTransport){				content["dojo.transport"] = "scriptsrc";			}			if(jsonpName){				content[jsonpName] = "dojo.io.ScriptSrcTransport._state." + id + ".jsonpCall";			}		}		if(kwArgs.postContent){			query = kwArgs.postContent;		}else if(content){			query += ((query) ? "&" : "") + dojo.io.argsFromMap(content, kwArgs.encoding, jsonpName);		}		//END duplication from BrowserIO.js		//START DSR		//If an apiId is specified, then we want to make sure useRequestId is true.		if(kwArgs["apiId"]){			kwArgs["useRequestId"] = true;		}		//Set up the state for this request.		var state = {			"id": id,			"idParam": "_dsrid=" + id,			"url": url,			"query": query,			"kwArgs": kwArgs,			"startTime": (new Date()).getTime(),			"isFinishing": false		};		if(!url){			//Error. An URL is needed.			this._finish(state, "error", {status: this.DsrStatusCodes.Error, statusText: "url.none"});			return;		}		//If this is a jsonp request, intercept the jsonp callback		if(content && content[jsonpName]){			state.jsonp = content[jsonpName];			state.jsonpCall = function(data){				if(data["Error"]||data["error"]){					if(dojo["json"] && dojo["json"]["serialize"]){						dojo.debug(dojo.json.serialize(data));					}					dojo.io.ScriptSrcTransport._finish(this, "error", data);				}else{					dojo.io.ScriptSrcTransport._finish(this, "load", data);				}			};		}		//Only store the request state on the state tracking object if a callback		//is expected or if polling on a checkString will be done.		if(kwArgs["useRequestId"] || kwArgs["checkString"] || state["jsonp"]){			this._state[id] = state;		}		//A checkstring is a string that if evaled will not be undefined once the		//script src loads. Used as an alternative to depending on a callback from		//the script file. If this is set, then multipart is not assumed to be used,		//since multipart requires a specific callback. With checkString we will be doing		//polling.		if(kwArgs["checkString"]){			state.checkString = kwArgs["checkString"];		}		//Constant params are parameters that should always be sent with each