Never reach readystate 4

[ilbo]

Hello, for some reason I never reach readystate "4" for when I make a call to the search function below. It doesn't seem to matter if I make the call one or more times, but when I change "true" to "false" in the httpObject.open method, I reach readysate 4. The "method" variable specifies the file name (e.g. "helloworld.php"). Any thoughts?

function search(method){
var httpObject = getHTTPObject();
if (httpObject != null)
{
httpObject.open("GET", method, true);
httpObject.send(null);
httpObject.onreadystatechange = setOutput(httpObject);
}
}

function getHTTPObject(){
if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
else if (window.XMLHttpRequest) return new XMLHttpRequest();
else
{
alert("Your browser does not support AJAX.");
return null;
}
}

function setOutput(httpObject){
if(httpObject.readyState == 4)
{
alert("Hello world!");
}
}

[ckeyrouz]

Go to this URL:
http://www.devguru.com/Technologies/...arseError.html


you might need to alert(httpObject.parseError.reason)

there are many xml debugging properties that you can find in this page.

[randomuser773]

Originally Posted by ilbo

Hello, for some reason I never reach readystate "4" for when I make a call to the search function below. It doesn't seem to matter if I make the call one or more times, but when I change "true" to "false" in the httpObject.open method, I reach readysate 4. The "method" variable specifies the file name (e.g. "helloworld.php"). Any thoughts?

Perhaps:

httpObject.onreadystatechange = function(){ setOutput( this ); };

[ilbo]

I'm not outputting any XML though. It's just a PHP script that performs several databasing operations.

[ilbo]

Also, I'm positive that the setOutput function is being called. I just never get the "4" readystate value.

[randomuser773]

Originally Posted by ilbo

Also, I'm positive that the setOutput function is being called. I just never get the "4" readystate value.

Another thing I just noticed is that you must always install the readystatechange handler before calling send.

[ilbo]

I moved the readystatechange handler up, but that doesn't seem to do it.

This is weird because I get the readystate 4 value when I use "false" in the httpObject.open method.

[randomuser773]

Originally Posted by ilbo

I moved the readystatechange handler up, but that doesn't seem to do it.

This is weird because I get the readystate 4 value when I use "false" in the httpObject.open method.

Another thing I just noticed is that the request object isn't global so it gets hosed when the creating function ends. That's why it survives for a synchronous request.
Looks like you made all the common mistakes in one attempt.

[ilbo]

I made it global. No go.

[randomuser773]

Originally Posted by ilbo

I made it global. No go.

Perhaps you could show the updated code, or preferably a test URL?