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8.2

Multiple Ajax request problem again

Asked by cstsang in JavaScript, Java Server Pages (JSP), Asynchronous Javascript and XML (AJAX)

I have 3 file, 1 is html,1 is jsp ,1 is js.
The html issue 2 ajax request to server for display the server time in 2 table cell.
I found the it either:

1) execute the second request only, OR
2)execute both of them but it execute the first request more than once.

So, would you tell me how can I solve the problem?

thank you very much

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             testAjax.htm:
 
<html>
	<head>
		<script src="js/Ajax.js" type="text/javascript"></script>
	</head>
	<body onload="startTest()">
	<table border=1>
		<tr>
		<td>1</td>
		<td id="d1"></td>
		</tr>
		<tr>
		<td>2</td>
		<td id="d2"></td>
		</tr>
	</table>
	<div id=error>
	</div>	
	</body>
	<script language=javascript>
		var a1=new Ajax();
		var a2=new Ajax();
		var qk;
		function startTest()
		{
			a1.sentAjaxPostRequest("time.jsp","",a1Handler);
			a2.sentAjaxPostRequest("time.jsp","",a2Handler);
			qk=document.getElementById("error");
		}
		function a1Handler()
		{
			if (a1.getReadyState()== 4 && a1.getStatus() == 200)
			{
				var d1=document.getElementById("d1");
				d1.innerHTML+=a1.getResponseText();
				qk.innerHTML+="d1 called<br>";
			}
		}
		function a2Handler()
		{
			if (a2.getReadyState()== 4 && a2.getStatus() == 200) 	
			{
				var d2=document.getElementById("d2");
				d2.innerHTML+=a2.getResponseText();
				qk.innerHTML+="d2 called<br>";
			}
		}
	</script>
</html>	
 
Ajax.js:
function Ajax()
{
	this.UNINITIALIZED_STATE=0;
	this.LOADING_STATE=1;
	this.LOADED_STATE=2;
	this.INTERACTIVE_STATE=3;
	this.COMPLETE_STATE=4;
	this.ajaxRequest;
	this.getXmlHttpRequestObject=function()
								 {
									if (window.XMLHttpRequest) {
											return new XMLHttpRequest();
										} else if(window.ActiveXObject) {
											return new ActiveXObject("Microsoft.XMLHTTP");
										} else {
											alert("Your Browser Sucks!\nIt's about time to upgrade don't you think?");
										}
								};
	this.sentAjaxPostRequest=function(action,params,handler) 
  					 {
						ajaxRequest=this.getXmlHttpRequestObject(); 
						if (ajaxRequest.readyState == this.COMPLETE_STATE || ajaxRequest.readyState == this.UNINITIALIZED_STATE)
						{
							ajaxRequest.open("post", action, true);
							ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded;charset=UTF-8");
							ajaxRequest.setRequestHeader("Content-length", params.length);
							ajaxRequest.setRequestHeader("Connection", "close");
							ajaxRequest.onreadystatechange =handler; 
							ajaxRequest.send(params);	
						}
					 };
	this.getStatus=function ()
					{
						return ajaxRequest.status;
					};
	this.getReadyState=function()
					   {
						 return ajaxRequest.readyState;
					   };
	this.getResponseText=function()
			             {
		    	           return ajaxRequest.responseText;
	            		 }; 
	this.getResponseXMLText=function()
	                    	{
	               				return ajaxRequest.responseXML;
	               			};           				
}
 
time.jsp:
<%=new java.util.Date()%>

           
         

	Title
1	Multiple MASTER/DETAIL drop down …
2	quetions on not using frames

Multiple Ajax request problem again

Asked by cstsang in JavaScript, Java Server Pages (JSP), Asynchronous Javascript and XML (AJAX)

About this solution