XMLHttpRequest not getting results back

**OpelCorsa** · 04-22-2010 05:32 PM

I'll make it short. Here's the code (the GET request is taken from a Google example):

Code:

<html>
	<script>
		function hello() {
			var xmlhttp = null;
			if (window.XMLHttpRequest) {
				xmlhttp = new XMLHttpRequest();
				if (typeof xmlhttp.overrideMimeType != 'undefined') {
					xmlhttp.overrideMimeType('text/xml');
				}
			}
			else {
				if (window.ActiveXObject) {
					xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				}
				else {
					alert('Perhaps your browser does not support xmlhttprequests?');
				}
			}
			
			xmlhttp.open("GET", "http://www.google.com/search?hl=en&q=benjamin+schirmer", true);
			xmlhttp.send();
					
			xmlhttp.onreadystatechange = function(){
				if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
					alert("OK");
				}
				else {
				}
			};
			
		}
	</script>
	<body onload="hello()"> 
	</body>
</html>

The problem: the alert never displays. Firebug shows xmlhttp.status = 0 and responseText = "" all the time. The page is on my local machine.

Any ideas on how to get this to work? Thanks!

P.S> I've tried doing a synchronous call as well but that gives me an error message; something like 0x80004005 (NS_ERROR_FAILURE) [nsIXMLHttpRequest.send

**tirna** · 04-22-2010 05:46 PM

I copy and pasted your code and it works fine in IE8 but not in FF3.6 or OP10.

In IE8 I get back the html from the google search results page.

I modified and added an alert (see below) to make sure the ajax response is coming back.

I suspect that maybe the way google is outputing its code is causing problems for FF but not IE. AJAX nirmally sends back either xml data or the output from echo statements in php or the equivalent in other server side scripting languages.

PHP Code:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>

<script>
  function hello() {
   var xmlhttp = null;
   if (window.XMLHttpRequest) {
    xmlhttp = new XMLHttpRequest();
    if (typeof xmlhttp.overrideMimeType != 'undefined') {
     xmlhttp.overrideMimeType('text/xml');
    }
   }
   else {
    if (window.ActiveXObject) {
     xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else {
     alert('Perhaps your browser does not support xmlhttprequests?');
    }
   }
   
   xmlhttp.open("GET", "http://www.google.com/search?hl=en&q=benjamin+schirmer", true);
   xmlhttp.send();
     
   xmlhttp.onreadystatechange = function(){
            
                alert(xmlhttp.readyState);
            
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {

     alert(xmlhttp.responseText);
    }

    else {
    }
   };
   
  }
 </script>
 <body onload="hello()"> 
</html>

**OpelCorsa** · 04-22-2010 06:24 PM

That's an interesting find. I was only testing it on Firefox and Chrome. So I've decided to look at another alternative -and the first thing I thought of was dojo. But that one is not working either...

Web dev can be a very interesting job. NOT!

**tirna** · 04-22-2010 06:35 PM

Originally Posted by OpelCorsa

That's an interesting find. I was only testing it on Firefox and Chrome. So I've decided to look at another alternative -and the first thing I thought of was dojo. But that one is not working either...

Web dev can be a very interesting job. NOT!

Maybe it's character building

**OpelCorsa** · 04-23-2010 11:38 AM

Ok, so back to the original post. I'd heard that you cannot make GET requests to servers that are located in a different domain. But that code worked for Google. What the hell?! Am I having a case of Friday?

Please help defrost my brain -it's beginning to hurt.

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