/*
 * Name:
 *	    simpleVortalAjax
 *
 * Description:
 *     This Library is used to do a request to the server and get 
 *     and display record using ajax.
 *		
 *
 *	   
 * Preconditions/Input:
 *		-
 *
 * Postconditions/Output:
 *
 * Stored Procedures:
 *
 * Libraries:
 *
 * Log :
 *     11/10/2008 	Dipak A.Basantani
 */
var globalXMLHttpRequest;
var globalDisplayId = "";
var globalNotation = "";
var globalMethod = 'get';

function simpleVortalAjax(){
	
	 this.xmlHttpRequestObj = undefined;
	 this.notation = 'html'; // notation will be xml, html and json notation of ajax
	 this.url = undefined;
	 this.displayId = undefined;
	 this.displayIdArray = new Array(); // this will be useful when json notation will be used.
	 this.callBackFunction = undefined;
	 this.method = 'get';
	 
	 
	 //
	 // initialize all the required variables for the ajax request
	 //
	 this.initialize = function(url,notation,displayId,method)
	 {
	 	this.xmlHttpRequestObj = this.getXmlHttpRequstObject();
	 	this.notation = notation;
	 	this.displayId = displayId;
	 	this.method = method;
	 	
	 	//
	 	// following variables are only defined for IE - 6
	 	//
	 	globalXMLHttpRequest = this.xmlHttpRequestObj;
	 	globalDisplayId = displayId;
	 	globalNotation = notation
	 	globalMethod = method;
	 	
	 	this.url = url;
	 	try{
	 		
	 		//
	 		// IE-6 not allowing this operation.
	 		//
		 	this.stateChangeFunction.parentObj = this;
		 	this.xmlHttpRequestObj.parentObj = this;
	 	}catch(error){}
	 	
	 	this.xmlHttpRequestObj.onreadystatechange = this.stateChangeFunction;
	 	this.sendRequest();
	 	
	 }// end function initialize
	 
	//
	// for getting xmlhttp request object
	// 
	this.getXmlHttpRequstObject = function() 
	{

		var xmlHttp;
		try
	  	{
	  		// Firefox, Opera 8.0+, Safari
	  		xmlHttp=new XMLHttpRequest();
	  	}
		catch (e)
	  	{
	  	  // Internet Explorer
		  try
		  {
				xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		  }
		  catch (e)
		  {
		    try
		    {
		    	xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		    }
		    catch (e)
		    {
		      alert("Your browser does not support AJAX!");
		      return false;
		    }// end nested catch
		  }
	  	}// end first catch
	  	
	  	return xmlHttp;
	}// END FUNCTION - getXmlHttpRequstObject
	
	
	//
	// send teh request to server
	//
	this.sendRequest = function ()
	{
		if(globalMethod == 'post' || this.method == 'post')
		{
			var params;
			var onlyUrl;
			try{
					
					onlyUrl = this.url.substr(0,this.url.indexOf("?"))
					params = this.url.substr((this.url.indexOf("?")+1),this.url.length);
					params += "&sid="+Math.random();
					this.xmlHttpRequestObj.open("POST", onlyUrl, true);
					this.xmlHttpRequestObj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
					this.xmlHttpRequestObj.setRequestHeader("Content-length", params.length);
					this.xmlHttpRequestObj.setRequestHeader("Connection", "close");
					this.xmlHttpRequestObj.send(params);
			}
			catch(error)
			{
					var msg = "Please try again later!";
					document.getElementById('sort_order_messsage').innerHTML = "<font color=red><strong><center>"+msg+"</center></strong></font>";
					return;
			}
		}
		else
		{
			this.url = this.url+"&sid="+Math.random();
			this.xmlHttpRequestObj.open("GET",this.url,true);
	  		this.xmlHttpRequestObj.send(null);
		}
		
  	}// end function sendRequest to server.
	 
	//
	// on readystate change call the function.
	// 
	this.stateChangeFunction = function()
	{
		
		var tempParentObj = this.parentObj ;
		try
		{
			
			if(tempParentObj.xmlHttpRequestObj.readyState==4)
			{
				if(tempParentObj.callBackFunction != undefined)
				{
					// call the front-end library function for call back.
					eval('this.callBackFunction('+tempParentObj.xmlHttpRequestObj.responseText+')');
				}
				// else display html or json notation form.
				else
				{
					if(tempParentObj.notation == 'html')
					{
						if(tempParentObj.displayId != undefined)
						{
							document.getElementById(tempParentObj.displayId).innerHTML = tempParentObj.xmlHttpRequestObj.responseText;
							
							try{
							if(typeof(callBackFunctionAfterHTML) == "function")
							{
								callBackFunctionAfterHTML(tempParentObj.displayId);
							}
							}catch(fne){}
							
						}
					}
					else if(tempParentObj.notation == 'json')
					{
						callBackFunctionAfterAjax(tempParentObj.xmlHttpRequestObj.responseText);
						return false;
					}
				}//end else.display json or html notation form.
			}
		}
		catch(error)
		{
			
			//
			// speciall code for IE - 6
			//
			if(globalXMLHttpRequest.readyState==4)
			{
				if(globalNotation == 'html')
				{
					if(globalDisplayId != "")
					{
							document.getElementById(globalDisplayId).innerHTML = globalXMLHttpRequest.responseText;
							try{
							if(typeof(callBackFunctionAfterHTML) == "function")
								callBackFunctionAfterHTML(globalDisplayId);
							}catch(fne){}
					}//end else.display json or html notation form.
				}
				else if(globalNotation == 'json')
				{
					callBackFunctionAfterAjax(globalXMLHttpRequest.responseText);
				}
			}
			return false;
		}
	}// end function  onreadystatechange
}// end class function simpleVortalAjax