onreadystatechange is really only a property of XMLHttpRequest object. Therefore, You CANNOT use attachEvent on the object... (In my opinion, onreadystatechange should have something similar to e.g. onload property of window object...)

Hi:

I am also have a problem with onreadystatechange .

here is the code below i am using:

<script>

var req;

var which;

function fetchCorpClassTaxonomy(url) {

alert("entered into Ajax function");

if (window.XMLHttpRequest) { // Non-IE browsers

alert("NON IE Block is Invoked");

req = new XMLHttpRequest();

req.onreadystatechange = processStateChange;

try {

req.open("GET", url, true);

} catch (e) {

alert(e);

}

req.send(null);

} else if (window.ActiveXObject) { // IE

alert("entered into IE block");

req = new ActiveXObject("Microsoft.XMLHTTP");

if (req) {

alert("entered into if(req)");

req.onreadystatechange = processStateChange;

req.open("GET", url, true);

alert("readystate: "+ req.readyState);

req.send();

}

}

}

function processStateChange() {

alert("entered into processStateChange()");

if (req.readyState == 4) { // Complete

if (req.status == 200) { // OK response

alert("response received from server is "+req.responseText);

var serverResponse = req.responseText;

var fieldName = serverResponse.substring(0,serverResponse.indexOf ("|"));

//alert("fieldname string "+fieldName);

var restResponse = serverResponse.substring(serverResponse.indexOf ("|")+1,serverResponse.length);

//alert("rest of Response is "+restResponse);

if(fieldName == "classification"){

document.getElementById("subclassification").innerHTML = restResponse;

}

} else {

alert("Problem: " + req.statusText);

}

}

}


The function processStateChange() is not called.

what might be the problem..

Please give me your valuable suggestion as soon as possible.

Thanks.....

++++++++++++++++++++++++++++++++++++++++++++++++

function reportStatus()
{
    if (oReq.readyState == 4)
        alert('Transfer complete.');
}

var oReq = new XMLHttpRequest();
oReq.onreadystatechange = reportStatus;
oReq.open("GET", "http://localhost/test.xml", true);
oReq.send();

I think you are using the "old" version of req = new ActiveXObject("Microsoft.XMLHTTP");
It will work if you specify var req = new XMLHttpRequest();

problem with this is that when the page is reloaded, the counter resets and the same problem occurs. It might be a better idea to add a large randomized number that has a tiny chance of reoccurring.