readystate 4 not fired?

[tom-kester]

Hey all, I am new to ajax and am having some problems with it.

 

var xmlhttp;
function getgrain2(grid, sender) {alert(grid); alert(sender); alert(sender.parentNode); alert(sender.parentNode.parentNode);}
function getGrain(grid, sender)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
  var cell = sender.parentNode;
  var row = cell.parentNode;
var url="getgrain.php";
url=url+"?grid="+grid;
xmlhttp.onreadystatechange=stateChanged(row);
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged(row)
{

if (xmlhttp.readyState==4)
{
document.write(xmlhttp.responseText);
var result = xmlhttp.responseText;
var split = result.split("-");
var protien = split[0];
var fat = split[1];
var fiber = split[2];

}

}

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;
}

 

 

my issue is that I never seem to get into the if readystate == 4 section of the code.

 

I have done some research with no luck. I have used firebug and it shows that I have gotten a response, but I can't cause an alert with that response. Anyone able to point me in the right direction?

 

Thanks in advance.

 

Tom

[tom-kester]

xmlhttp.onreadystatechange=stateChanged(row);

function stateChanged(row)

 

apparently you can't pass an object through the function like that.. I solved my problem by changing the variable's scope.