/////////////////////////////////////////////////////
/////功能说明:Ajax调用方法                         //
/////作者:作礼文                                   //                                      
/////////////////////////////////////////////////////


// IE support
if (window.ActiveXObject && !window.XMLHttpRequest)
{
		window.XMLHttpRequest = function()
				{
						var msxmls = new Array('Msxml2.XMLHTTP.5.0','Msxml2.XMLHTTP.4.0','Msxml2.XMLHTTP.3.0','Msxml2.XMLHTTP','Microsoft.XMLHTTP');
						for (var i = 0; i < msxmls.length; i++)
						{
								try 
								{
										return new ActiveXObject(msxmls[i]);
								} 
								catch (e)
								{
								}
						}
						return null;
				};
}
 
// Gecko support
// Opera support
if (window.opera && !window.XMLHttpRequest)
{
		window.XMLHttpRequest = function()
		{
				this.readyState = 0; // 0=uninitialized,1=loading,2=loaded,3=interactive,4=complete
				this.status = 0; // HTTP status codes
				this.statusText = '';
				this._headers = [];
				this._aborted = false;
				this._async = true;
				this._defaultCharset = 'ISO-8859-1';
				this._getCharset = function() 
				{
						var charset = _defaultCharset;
						var contentType = this.getResponseHeader('Content-type').toUpperCase();
						val = contentType.indexOf('CHARSET=');
						if (val != -1) 
						{
								charset = contentType.substring(val);
						}
						val = charset.indexOf(';');
						if (val != -1)
						{
								charset = charset.substring(0, val);
						}
						val = charset.indexOf(',');
						if (val != -1)
						{
								charset = charset.substring(0, val);
						}

						return charset;
				};
 
				this.abort = function()
				{
						this._aborted = true;
				};
 
				this.getAllResponseHeaders = function()
				{
						return this.getAllResponseHeader('*');
				};
 
				this.getAllResponseHeader = function(header)
				{
						var ret = '';
						for (var i = 0; i < this._headers.length; i++)
						{
								if (header == '*' || this._headers[i].h == header)
								{
										ret += this._headers[i].h + ': ' + this._headers[i].v + 'n';
								}
						}
						return ret;
				};
 
				this.getResponseHeader = function(header)
				{
						var ret = getAllResponseHeader(header);
						var i = ret.indexOf('n');
						if (i != -1)
						{
								ret = ret.substring(0, i);
						}
						return ret;
				};
 
				this.setRequestHeader = function(header, value)
				{
						this._headers[this._headers.length] = {h:header, v:value};
				};
 
				this.open = function(method, url, async, user, password)
				{
						this.method = method;
						this.url = url;
						this._async = true;
						this._aborted = false;
						this._headers = [];
						if (arguments.length >= 3) 
						{
								this._async = async;
						}
						if (arguments.length > 3) 
						{
								opera.postError('XMLHttpRequest.open() - user/password not supported');
						}
						this.readyState = 1;
						if (this.onreadystatechange)
						{
								this.onreadystatechange();
						}
				};
 
				this.send = function(data)
				{
						if (!navigator.javaEnabled())
						{
								alert("XMLHttpRequest.send() - Java must be installed and enabled.");
								return;
						}
						if (this._async)
						{
								setTimeout(this._sendasync, 0, this, data);
						} 
						else
						{
								this._sendsync(data);
						}
				};
 
				this._sendasync = function(req, data)
				{
						if (!req._aborted)
						{
								req._sendsync(data);
						}
				};
 
				this._sendsync = function(data)
				{
						this.readyState = 2;
						if (this.onreadystatechange)
						{
								this.onreadystatechange();
						}
						var url = new java.net.URL(new java.net.URL(window.location.href), this.url);
						var conn = url.openConnection();
						for (var i = 0; i < this._headers.length; i++)
						{
								conn.setRequestProperty(this._headers[i].h, this._headers[i].v);
						}
						this._headers = [];
						if (this.method == 'POST')
						{
						// POST data
								conn.setDoOutput(true);
								var wr = new java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());
								wr.write(data);
								wr.flush();
								wr.close();
						}
						// read response headers
						// NOTE: the getHeaderField() methods always return nulls for me :(
						var gotContentEncoding = false;
						var gotContentLength = false;
						var gotContentType = false;
						var gotDate = false;
						var gotExpiration = false;
						var gotLastModified = false;
						for (var i = 0; ; i++)
						{
								var hdrName = conn.getHeaderFieldKey(i);
								var hdrValue = conn.getHeaderField(i);
								if (hdrName == null && hdrValue == null)
								{
										break;
								}
								if (hdrName != null)
								{
										this._headers[this._headers.length] = {h:hdrName, v:hdrValue};
										switch (hdrName.toLowerCase())
										{
												case 'content-encoding': gotContentEncoding = true; break;
												case 'content-length' : gotContentLength = true; break;
												case 'content-type' : gotContentType = true; break;
												case 'date' : gotDate = true; break;
												case 'expires' : gotExpiration = true; break;
												case 'last-modified' : gotLastModified = true; break;
										}
								}
						}
						// try to fill in any missing header information
						var val;
						val = conn.getContentEncoding();
						if (val != null && !gotContentEncoding) this._headers[this._headers.length] = {h:'Content-encoding', v:val};
						val = conn.getContentLength();
						if (val != -1 && !gotContentLength) this._headers[this._headers.length] = {h:'Content-length', v:val};
						val = conn.getContentType();
						if (val != null && !gotContentType) this._headers[this._headers.length] = {h:'Content-type', v:val};
						val = conn.getDate();
						if (val != 0 && !gotDate) this._headers[this._headers.length] = {h:'Date', v:(new Date(val)).toUTCString()};
						val = conn.getExpiration();
						if (val != 0 && !gotExpiration) this._headers[this._headers.length] = {h:'Expires', v:(new Date(val)).toUTCString()};
						val = conn.getLastModified();
						if (val != 0 && !gotLastModified) this._headers[this._headers.length] = {h:'Last-modified', v:(new Date(val)).toUTCString()};
						// read response data
						var reqdata = '';
						var stream = conn.getInputStream();
						if (stream)
						{
								var reader = new java.io.BufferedReader(new java.io.InputStreamReader(stream, this._getCharset()));
								var line;
								while ((line = reader.readLine()) != null)
								{
										if (this.readyState == 2)
										{
												this.readyState = 3;
												if (this.onreadystatechange)
												{
														this.onreadystatechange();
												}
										}
										reqdata += line + '\n';
								}
								reader.close();
								this.status = 200;
								this.statusText = 'OK';
								this.responseText = reqdata;
								this.readyState = 4;
								if (this.onreadystatechange)
								{
										this.onreadystatechange();
								}
								if (this.onload)
								{
										this.onload();
								}
						}
						else
						{
								// error
								this.status = 404;
								this.statusText = 'Not Found';
								this.responseText = '';
								this.readyState = 4;
								if (this.onreadystatechange)
								{
										this.onreadystatechange();
								}
								if (this.onerror)
								{
										this.onerror();
								}
						}
				};
		};
}
 
// ActiveXObject emulation
if (!window.ActiveXObject && window.XMLHttpRequest)
{
		window.ActiveXObject = function(type)
		{
				switch (type.toLowerCase())
				{
						case 'microsoft.xmlhttp':
								case 'msxml2.xmlhttp':
								case 'msxml2.xmlhttp.3.0':
								case 'msxml2.xmlhttp.4.0':
								case 'msxml2.xmlhttp.5.0':
								return new XMLHttpRequest();
				}
				return null;
		};
}

//url 
//senddata 
//returntype xml:xmldoc,else htmltext
var http_request = false;
var responsetype = 'txt';
var whichobjid;
	function GetResponse(url,senddata,returntype,sourceobjid){
	//alert('url=='+url);
	//alert('returntype=='+returntype);
	//alert('returntype=='+sourceobjid);
	if(url){
		responsetype = returntype;
		whichobjid = sourceobjid;
		//new XMLHttpRequest
		http_request=new XMLHttpRequest();
		//Response
		if(http_request){
			http_request.onreadystatechange=getRequestResult;
			
			http_request.open('POST',url,true);

			//http_request.setRequestHeader('Content-Type','application/x-www-form-urlencoded');    
			http_request.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=iso-8859-1' );
			  //alert("run this is url==="+url+"    senddata==="+senddata);                             
			if(senddata==''){
				http_request.send(null);
			}
			else{
				http_request.send(senddata);
			}
		}
  }
}
function getRequestResult(){ 
	if(http_request.readyState==4){
		if(http_request.status==200){
			var doc = null;
			if(responsetype == 'xml'){
				doc =  http_request.responseXML;
			}
			else{
				doc = http_request.responseText;
			}
			ShowDiv(doc,whichobjid);
		}
		else if(http_request.status==404){
			alert('没有发现文件、查询或URl');
		}
		else {
			alert ('status = '+http_request.status);
		}
	}
}