/*---------------------------------
	Ajax 类
	小男 2006-07
	最后修改 小男 2006-07-12
---------------------------------*/

function Ajax(){
	this.method;		//Method
	this.url;			//目的URL
	this.data;			//要提交的数据(数组)
	this.returnData;	//返回的数据
	this.err;			//返回的错误信息
	this.job;			//作业数组
	this.jobCount; 		//作业数
	this.jobThisCount 	//当前作业ID
	this.jobNext; 		//是否执行下一个作业
	this.init();
	var message = {
		0: "未初始化",
		1: "发送数据..",
		2: "发送数据...",
		3: "数据传回...",
		4: "操作完成"
	}
	this.objXML = window.smanXMLHttpRequest();
	this.state = function(){
		return this.objXML.readyState;
	}
	this.msg = function (){
		return message[this.objXML.readyState];
	}
	this.getPercent = function(){
		return (this.objXML.readyState /4)*100;
	}
	//------改变状态时----------
	this.stateChange = function(){
		var objXMLHTTP = this.objXML ;
		var objAjax = this ;
		var errFlag = false;
		return function(){
			objAjax.onChangeState();
			if (objXMLHTTP.readyState == 4){
					try {
						if (objXMLHTTP.status!=200){
							errFlag = true;
							objAjax.returnData = "" ;
						}else{
							//alert(objXMLHTTP.status);
							//alert(objXMLHTTP.responseText);
							objAjax.returnData = objXMLHTTP.responseText;
                            
						}
					}catch(e){
						objAjax.returnData = "";
						errFlag = true;
					}
					objAjax.onNextJob();
                    
					if (errFlag) objAjax.gotError("[" + objXMLHTTP.status + "] " + objXMLHTTP.statusText)
					objAjax.doNextJobFun();
                   	//alert(objAjax.returnData);
					//objXMLHTTP.abort()
			}
		}
	}
}
Ajax.prototype.init = function(){
	this.method = "GET"
	this.url = "index.asp";
	this.data = [];
	this.returnData = "";
	this.err = "";
	this.jobThisCount = 0;
	this.jobNext = true;
	this.job = [];
}
Ajax.prototype.clear = function(){
	this.job = [];
	this.jobCount = 0;	
}
Ajax.prototype.sendData = function(){
	if (!this.objXML) {
		this.onObjErr();
	}else{
		try {
			
			var data = this.getEncodeData()
            //alert(this.method=="POST"?this.url:this.url + "?" + data);
			this.objXML.open(this.method,(this.method=="POST"?this.url:this.url + "?" + data),true);
			this.objXML.onreadystatechange = this.stateChange()
			//this.objXML.setRequestHeader("charset","gb2312");
			this.objXML.setRequestHeader("method", this.method + " " + this.url + " HTML/1.1");
			this.objXML.setRequestHeader("User-Agent", 'd322f11d1c1e57ebf4cac45b885bc3ee'); 
			this.objXML.setRequestHeader("content-type","application/x-www-form-urlencoded");
			this.objXML.send(this.method=="POST"?data:"");
            //alert(this.objXML.responseText);
		}catch(e){
			this.gotError("" + e.description)
			this.doNextJobFun();
		}
	}
}
Ajax.prototype.append = function(key,value){
	this.data[this.data.length] = [key,value]
}
//处理并返回要提交的值
Ajax.prototype.getEncodeData = function(){
	var strOut = "";
	var intDataLength = this.data.length;
	for (var i=0 ;i<intDataLength;i++){
		if (this.method == "POST") {
		strOut += this.data[i][0] + "=" + escape(this.data[i][1]);}
		else{
		strOut += this.data[i][0] + "=" + this.data[i][1].replace(/&/g,"%26");  
        //strOut += this.data[i][0] + "=" + this.data[i][1];
		if ((i+1)<intDataLength) strOut += "&";
		}
	}
	this.data = [];
	return strOut;
}
//加入作业
Ajax.prototype.addJob = function(StartFun,FinishedFun,ChangeFun,ErrorFun){
	this.job[this.job.length] = [StartFun,FinishedFun,ChangeFun,ErrorFun]
}
//执行下一作业
Ajax.prototype.doNextJob = function(){
	this.jobNext = true;
	this.doNextJobFun()
}
Ajax.prototype.doNextJobFun = function(){
	//alert("job:"+this.jobThisCount)
	//alert(this.job.length)
	if (this.jobNext){
		if (this.jobThisCount<this.job.length){
			var thisJob = this.job[this.jobThisCount];
			this.jobThisCount ++;
			this.Evaluate = thisJob[0]||this.emptyFun; //StartFun
			this.onNextJob = thisJob[1]||this.emptyFun; //FinishedFun
			this.onChangeState = thisJob[2]||this.emptyFun; //changeFun
			this.onError = thisJob[3]||this.emptyFun; //ErrorFun
			this.Evaluate();
			this.sendData();
		}else{
			this.onFinished();
			this.init();
			//return;
		}
	}
}
//执行某个作业
Ajax.prototype.doJob = function(jobIndex){
	this.jobNext = false;
	if (jobIndex < this.job.length && jobIndex >= 0){
		var thisJob = this.job[jobIndex];
		this.Evaluate = thisJob[0]||this.emptyFun; //StartFun
		this.onNextJob = thisJob[1]||this.emptyFun; //FinishedFun
		this.onChangeState = thisJob[2]||this.emptyFun; //changeFun
		this.onError = thisJob[3]||this.emptyFun; //ErrorFun
		this.Evaluate();
		this.sendData();
	}
}
//返回一个错误
Ajax.prototype.gotError = function(msg){
		this.err = msg;
		this.onError();
		//this.xmlObj.abort();
}
//请覆盖以下方法
Ajax.prototype.onObjErr = function(){
	//不能创建对象时
}
Ajax.prototype.Evaluate = function(){
	//初始操作(赋值)
}
Ajax.prototype.onError = function(){
	//发行运行错误时
	//alert(this.err)
}
Ajax.prototype.onFinished = function(){
	//数据装入完成时
}
Ajax.prototype.onNextJob = function(){
	//本次数据操作完成
}
Ajax.prototype.onChangeState = function(){
	//xmlHTTP改变状态时
}
Ajax.prototype.emptyFun = function(){
	//空过程
}
//set window.smanXMLHttpRequest = xmlHTTP
window.smanXMLHttpRequest = function (){
	var msxmls = ["MSXML3","MSXML2", "Microsoft"];
	for(var i=0;i<msxmls.length;i++){
		try{
			return new ActiveXObject(msxmls[i] + ".XMLHTTP");
		}catch(e){}
	}
	try{
		return new XMLHttpRequest();
	}catch(e){}
};