Delay with AJAX request

[emozley]

Hi,

I have a page (written in ASP) that displays a series of titles. When you click a title it unhides a div and then makes an AJAX request to look up more information about that particular title and then displays it in the div.

For some reason when I click the link there is quite a long pause (about 4 seconds on average) before it displays the text but on the other hand if I run the ASP on it's own eg showcsritem.asp?CSRPostID=5 it displays almost immediately.

Has anyone ever come across this sort of problem before?

Thanks

Ed

 

[Zhris]

Hello,

Could you post your AJAX code? There is a possiblity that your script uses the javascript setTimeout function and has been set to around 4000 milliseconds, which needs to be lowered.

Chris

 

[emozley]

Here's the code

var xmlhttp

function showItem(CSRPostID)
{
if (CSRPostID.length==0)
  {
  document.getElementById("mypopup2").innerHTML="";
  return;
  }
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support XMLHTTP!");
  return;
  }
var url="showcsritem.asp";
url=url+"?CSRPostID="+CSRPostID;
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
if (xmlhttp.readyState==4)
  {
  document.getElementById("mypopup2").innerHTML=xmlhttp.responseText;
  }
}

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}

It's the same code I've used elsewhere and not had any performance issues - if need be I can post the other scripts; there are hidden divs and server side includes and stuff which might complicate things slightly but at the moment it's a real puzzler!

Thanks

Ed