// ===================================================================
// Author: Matt Kruse <matt@ajaxtoolbox.com>
// WWW: http://www.AjaxToolbox.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. 
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

function AjaxRequest()
{
	var req =new Object();
	req.timeout =null;
	req.generateUniqueUrl =true;
	req.url =window.location.href;
	req.method ="GET";
	req.async =true;
	req.username =null;
	req.password =null;
	req.parameters =new Object();
	req.requestIndex =AjaxRequest.numAjaxRequests++;
	req.responseReceived =false;
	req.groupName =null;
	req.queryString ="";
	req.responseText =null;
	req.responseXML =null;
	req.status =null;
	req.statusText =null;
	req.aborted =false;
	req.xmlHttpRequest =null;
	req.onTimeout=null;
	req.onLoading=null;
	req.onLoaded=null;
	req.onInteractive=null;
	req.onComplete=null;
	req.onSuccess=null;
	req.onError=null;
	req.onGroupBegin=null;
	req.onGroupEnd=null;
	req.xmlHttpRequest =AjaxRequest.getXmlHttpRequest();

	if(req.xmlHttpRequest==null)
	{
		return null;
	}
	req.xmlHttpRequest.onreadystatechange =function()
										{
											if(req==null || req.xmlHttpRequest==null)
												{return;}
											if(req.xmlHttpRequest.readyState==1)
												{
													req.onLoadingInternal(req);
												}
											if(req.xmlHttpRequest.readyState==2)
												{req.onLoadedInternal(req);}
											if(req.xmlHttpRequest.readyState==3)
												{req.onInteractiveInternal(req);}
											if(req.xmlHttpRequest.readyState==4)
												{req.onCompleteInternal(req);}
										};
	req.onLoadingInternalHandled=false;
	req.onLoadedInternalHandled=false;
	req.onInteractiveInternalHandled=false;
	req.onCompleteInternalHandled=false;

	req.onLoadingInternal= function()
					{
						if(req.onLoadingInternalHandled)
							{return;}
						AjaxRequest.numActiveAjaxRequests++;
						
						if(AjaxRequest.numActiveAjaxRequests==1 && typeof(window['AjaxRequestBegin'])=="function")
							{AjaxRequestBegin();}
							
						if(req.groupName!=null)
						{
							if(typeof(AjaxRequest.numActiveAjaxGroupRequests[req.groupName])=="undefined")
								{
									AjaxRequest.numActiveAjaxGroupRequests[req.groupName] =0;
								}
							AjaxRequest.numActiveAjaxGroupRequests[req.groupName]++;
							
							if(AjaxRequest.numActiveAjaxGroupRequests[req.groupName]==1 && typeof(req.onGroupBegin)=="function")
							{
								req.onGroupBegin(req.groupName);
							}
						}
						if(typeof(req.onLoading)=="function")
						{
							req.onLoading(req);
						}
						req.onLoadingInternalHandled=true;};
		req.onLoadedInternal=
		function()
		{	
			if(req.onLoadedInternalHandled){return;}
			
			if(typeof(req.onLoaded)=="function"){req.onLoaded(req);}
			
			req.onLoadedInternalHandled=true;
		};
		
		req.onInteractiveInternal=
		function()
		{
			if(req.onInteractiveInternalHandled){return;}
			if(typeof(req.onInteractive)=="function"){req.onInteractive(req);}
			
			req.onInteractiveInternalHandled=true;
		};
			
		req.onCompleteInternal=
		function()
		{
			if(req.onCompleteInternalHandled || req.aborted){return;}
			req.onCompleteInternalHandled=true;
			AjaxRequest.numActiveAjaxRequests--;
			
			if(AjaxRequest.numActiveAjaxRequests==0 && typeof(window['AjaxRequestEnd'])=="function")
			{
				AjaxRequestEnd(req.groupName);
			}
			if(req.groupName!=null)
			{
				AjaxRequest.numActiveAjaxGroupRequests[req.groupName]--;
			
				if(AjaxRequest.numActiveAjaxGroupRequests[req.groupName]==0 && typeof(req.onGroupEnd)=="function")
				{
					req.onGroupEnd(req.groupName);
				}
			}
			req.responseReceived =true;
			req.status =req.xmlHttpRequest.status;
			req.statusText =req.xmlHttpRequest.statusText;
			req.responseText =req.xmlHttpRequest.responseText;
			req.responseXML =req.xmlHttpRequest.responseXML;
			if(typeof(req.onComplete)=="function"){req.onComplete(req);}
			if(req.xmlHttpRequest.status==200 && typeof(req.onSuccess)=="function")
			{
				req.onSuccess(req);
			}
			else if(typeof(req.onError)=="function")
			{
				req.onError(req);
			}
			delete req.xmlHttpRequest['onreadystatechange'];
			req.xmlHttpRequest =null;
		};
		req.onTimeoutInternal=
		function()
		{
			if(req!=null && req.xmlHttpRequest!=null && !req.onCompleteInternalHandled)
			{
				req.aborted =true;
				req.xmlHttpRequest.abort();
				AjaxRequest.numActiveAjaxRequests--;
				if(AjaxRequest.numActiveAjaxRequests==0 && typeof(window['AjaxRequestEnd'])=="function")
				{
					AjaxRequestEnd(req.groupName);
				}
				if(req.groupName!=null){AjaxRequest.numActiveAjaxGroupRequests[req.groupName]--;
				
				if(AjaxRequest.numActiveAjaxGroupRequests[req.groupName]==0 && typeof(req.onGroupEnd)=="function")
				{
					req.onGroupEnd(req.groupName);
				}
			}
			if(typeof(req.onTimeout)=="function")
			{
				req.onTimeout(req);
			}
			delete req.xmlHttpRequest['onreadystatechange'];
			req.xmlHttpRequest =null;
			}
		};
req.process = function()
{
	if(req.xmlHttpRequest!=null)
		{			
			
			if(req.generateUniqueUrl && req.method=="GET")
			{
				req.parameters["AjaxRequestUniqueId"] =new Date().getTime() + "" + req.requestIndex;
			}
			var content =null;
			for(var i in req.parameters)
			{
				if(req.queryString.length>0)
				{
					req.queryString +="&";
				}
				req.queryString +=encodeURIComponent(i) + "=" + encodeURIComponent(req.parameters[i]);
				
			}
			if(req.method=="GET")
			{
				if(req.queryString.length>0)
				{
					req.url +=((req.url.indexOf("?")>-1)?"&":"?") + req.queryString;
				}
			}//alert(req.queryString);
		//	req.xmlHttpRequest.open(req.method,"http://localhost/overlib/repeat%20news/0.xml",req.async,req.username,req.password);
			req.xmlHttpRequest.open(req.method,req.url,req.async,req.username,req.password);
			if(req.method=="POST")
			{
				if(typeof(req.xmlHttpRequest.setRequestHeader)!="undefined")
				{
					req.xmlHttpRequest.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
				}
				content =req.queryString;
			}
			if(req.timeout>0)
			{
				setTimeout(req.onTimeoutInternal,req.timeout);
			}
			req.xmlHttpRequest.send(content);
		}
	};
	req.handleArguments = function(args)
	{
		for(var i in args)
		{
			if(typeof(req[i])=="undefined")
			{
				req.parameters[i] =args[i];
			}
			else
			{
				req[i] =args[i];
			}
			
		}
	};
	req.getAllResponseHeaders = function()
	{
		if(req.xmlHttpRequest!=null)
		{
			if(req.responseReceived)
			{
				return req.xmlHttpRequest.getAllResponseHeaders();
			}
			alert("Cannot getAllResponseHeaders because a response has not yet been received");
		}
	};
	req.getResponseHeader = function(headerName)
	{
		if(req.xmlHttpRequest!=null)
		{
			if(req.responseReceived)
			{
				return req.xmlHttpRequest.getResponseHeader(headerName);
			}
			alert("Cannot getResponseHeader because a response has not yet been received");
		}
	};
	return req;
}
	AjaxRequest.getXmlHttpRequest =function()
	{
		if(window.XMLHttpRequest)
		{
			return new XMLHttpRequest();
		}
		else if(window.ActiveXObject){/*@cc_on @*/
/*@if(@_jscript_version >=5)
try{return new ActiveXObject("Msxml2.XMLHTTP");}catch(e){try{return new ActiveXObject("Microsoft.XMLHTTP");}catch(E){return null;}}@end @*/
		}
		else
		{
			return null;
		}
	};
	AjaxRequest.isActive =function()
	{
		return(AjaxRequest.numActiveAjaxRequests>0);
	};
	
	AjaxRequest.get = function(args)
	{	
	
		AjaxRequest.doRequest("GET",args);
		
	};
	
	AjaxRequest.post = function(args)
	{
		AjaxRequest.doRequest("POST",args);
	};
	
	AjaxRequest.doRequest =function(method,args)
	{
		if(typeof(args)!="undefined" && args!=null)
		{

			var myRequest =new AjaxRequest();
			myRequest.method =method;
			myRequest.handleArguments(args);
			myRequest.process();
		}
	};
	AjaxRequest.submit = function(theform, args)
	{
		var myRequest =new AjaxRequest();
		if(myRequest==null){return false;}
		var serializedForm =AjaxRequest.serializeForm(theform);
		myRequest.method =theform.method.toUpperCase();
		myRequest.url =theform.action;
		myRequest.handleArguments(args);
		myRequest.queryString =serializedForm;
		myRequest.process();
		return true;
	};
	
	AjaxRequest.serializeForm =function(theform)
	{
		var els =theform.elements;
		var len =els.length;
		var queryString ="";
		this.addField = function(name,value)
		{
			if(queryString.length>0)
			{
				queryString +="&";
			}
			queryString +=encodeURIComponent(name) + "=" + encodeURIComponent(value);
		};
		for(var i=0;i<len;i++){var el =els[i];
		if(!el.disabled)
		{
			switch(el.type)
			{
				case 'text': 
				case 'password': 
				case 'hidden': 
				case 'textarea':
				this.addField(el.name,el.value);
				break;
				case 'select-one':
				if(el.selectedIndex>=0)
				{
					this.addField(el.name,el.options[el.selectedIndex].value);
				}
				break;
				case 'select-multiple':
				for(var j=0;j<el.options.length;j++)
				{
					if(el.options[j].selected)
					{
						this.addField(el.name,el.options[j].value);
					}
				}
				break;
				case 'checkbox': 
				case 'radio':
				if(el.checked)
				{
					this.addField(el.name,el.value);
				}
				break;
			}
		}
	}
	return queryString;
};
	AjaxRequest.numActiveAjaxRequests =0;
	AjaxRequest.numActiveAjaxGroupRequests =new Object();
	AjaxRequest.numAjaxRequests =0;