/*---------------------------------------------------------------------------*\
|  Subject:       Web Match Class                                             |
|  Version:       1.0                                                         |
|  Author:        【曹明旭】                                                  |
|  FileName:      XmlHttpFinally.js                                           |
|  Created:       2008-5-15                                                   |
|  LastModified:  2008-5-15                                                   |
|                                                                             |
|                 You may use this code on your item                          |
|                 this entire copyright notice appears unchanged              |
|                 and you clearly display a link to http://www.jingjiba.com/  |
|                 坚持自主创新才是唯一出路,国富才能民强,我为地震捐赠200RMB    |
|-----------------------------------------------------------------------------|
|  MSN: risingsunlinux@hotmail.com   QQ: 181131433   http://www.jingjiba.com  |
\*---------------------------------------------------------------------------*/
//虽然XmlHttp.js很好用了,但是因为如果一个页面中存在多个调用的时候,总是会出现冲突的情况,本js就是为了解决这个问题而出现的,
//这里添加了XmlHttp对象的对象池很好的解决了这个问题
//调用规则:调用的脚本要放在赋值对象的后面 否则会出现对象为null的错误
//同时可以传递参数,为多个调用提供强有力的支持
function $() {
  var elements = new Array();
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);
    if (arguments.length == 1)
      return element;
    elements.push(element);
  }
  return elements;
}
//-------------------------------------------------------

//封装XMLHTTP的Request类的代码 
var Request = new Object();
//定义一个XMLHTTP的数组
Request.reqList = [];
function CallBackObject()
{
  this.XmlHttp = this.GetHttpObject();
}
 
CallBackObject.prototype.GetHttpObject = function()
{ 
  var xmlhttp;
  /*@cc_on
  @if (@_jscript_version >= 5)
    try {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (E) {
        xmlhttp = false;
      }
    }
  @else
  xmlhttp = false;
  @end @*/
  if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
    try {
      xmlhttp = new XMLHttpRequest();
    } catch (e) {
      xmlhttp = false;
    }
  }
  return xmlhttp;
}
//封装XMLHTTP向服务器发送请求的操作
//url:向服务器请求的路径；method：请求的方法，即是GET还是POST；callback：当服务器成功返回结果时，调用的函数
//data：向服务器请求时附带的数据；urlencoded：url是否编码；callback2;当服务器返回错误时调用的函数
Request.Send = function( url, method, CallBackFun, Args, urlencoded, ErrCallBackFun,LoadingCallBackFun)
{
    var Cbo = new CallBackObject();
    Cbo.DoCallBack( url, method, CallBackFun, Args, urlencoded, ErrCallBackFun,LoadingCallBackFun)
}
//全部清除XMLHTTP数组元素，释放资源
Request.clearReqList = function() 
{
	var ln = Request.reqList.length;
	for (var i=0; i<ln; i++) {
		var req = Request.reqList[i];
		if (req) 
		{
		    try 
		    {
			    delete req;
		    } catch(e) {}
		}
	}
	Request.reqList = [];
}
//进一步封装XMLHTTP以POST方式发送请求时的代码
//clear：是否清除XMLHTTP数组的所有元素；其他参数的意义参见Request.send
Request.sendPOST = function(url, data, CallBackFun, clear, ErrCallBackFun,LoadingCallBackFun) 
{
	if (clear)
		Request.clearReqList();

	Request.Send(url, "POST", CallBackFun, data, true, ErrCallBackFun,LoadingCallBackFun);
}
//进一步封装XMLHTTP以GET方式发送请求时的代码
Request.sendGET = function(url, args, CallBackFun, clear, ErrCallBackFun,LoadingCallBackFun) 
{
	if (clear)
		Request.clearReqList();
	return Request.Send(url, "GET", CallBackFun, args, false, ErrCallBackFun,LoadingCallBackFun);
}

CallBackObject.prototype.DoCallBack = function( url, method, CallBackFun, Args, urlencoded, ErrCallBackFun,LoadingCallBackFun)
{
    var oThis = this;
    //如果以POST方式回发服务器
	if (method=="POST")
	 {
		this.XmlHttp.open("POST", url, true);
		this.XmlHttp.onreadystatechange = function(){ oThis.ReadyStateChange(CallBackFun,Args,ErrCallBackFun,LoadingCallBackFun); };
		//请求需要编码
		if (urlencoded) 
		    this.XmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');		
		this.XmlHttp.send(data);
		Request.reqList.push(this.XmlHttp);
	}
	//以GET方式请求
	else 
	{
		this.XmlHttp.open("GET", url, true);
		this.XmlHttp.onreadystatechange = function(){ oThis.ReadyStateChange(CallBackFun,Args,ErrCallBackFun,LoadingCallBackFun); };
		this.XmlHttp.send(null);
		Request.reqList.push(this.XmlHttp);
	}
}
CallBackObject.prototype.AbortCallBack = function()
{
  if( this.XmlHttp )
    this.XmlHttp.abort();
}
 
CallBackObject.prototype.OnLoading = function(LoadingCallBackFun)
{
  // Loading
  if(LoadingCallBackFun)LoadingCallBackFun();
}
 
CallBackObject.prototype.OnLoaded = function()
{
  // Loaded
}
 
CallBackObject.prototype.OnInteractive = function()
{
  // Interactive
}
 
CallBackObject.prototype.OnComplete = function(responseText, responseXml,CallBackFun,Args)
{
  // Complete
  CallBackFun(responseText,responseXml,Args);
}
 
CallBackObject.prototype.OnAbort = function()
{
  // Abort
  //alert("Error");
}
 
CallBackObject.prototype.OnError = function(status, statusText,ErrCallBackFun)
{
  // Error
  if(ErrCallBackFun)ErrCallBackFun(status, statusText);
}
 
CallBackObject.prototype.ReadyStateChange = function(CallBackFun,Args,ErrCallBackFun,LoadingCallBackFun)
{
  if( this.XmlHttp.readyState == 1 )
  {
    this.OnLoading(LoadingCallBackFun);
  }
  else if( this.XmlHttp.readyState == 2 )
  {
    this.OnLoaded();
  }
  else if( this.XmlHttp.readyState == 3 )
  {
    this.OnInteractive();
  }
  else if( this.XmlHttp.readyState == 4 )
  {
    if( this.XmlHttp.status == 0 )
      this.OnAbort();
    else if( this.XmlHttp.status == 200 && this.XmlHttp.statusText == "OK" )
      this.OnComplete(this.XmlHttp.responseText, this.XmlHttp.responseXML,CallBackFun,Args);
    else
      this.OnError(this.XmlHttp.status, this.XmlHttp.statusText,ErrCallBackFun);   
  }
}