AJAX Response not working in FF - ajax

Question

I have a bit of code which alerts the $response from a php code in IE, but for some reason it doesn't work in FF..
Here's the code:
function contactfunction() {
var url = "scripts/php/cbb.php?pname=";
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatecontact1;
xmlHttp.send(null);
}
function updatecontact1() {
if (xmlHttp.readyState == 4) {
var response = xmlHttp.responseText;
alert(response);
}
}
And here's the PHP file (cbb.php)
<?php
$fp=fopen("ip.txt","a+");
fwrite($fp, "cib\r\n");
fclose($fp);
$response = "something";
return $response;
?>
Can anyone help me out here? I'm not sure how to get it to work in FF, it just gives a blank popup..

Answer 1

Do yourself a favour, and use one of the many ajax capable Javascript libraries out there, like jQuery, which frees the user from hacking up code to deal with browser discrepancies (for the most part, at least):
//using jQuery's $.get method
function update(name) {
$.get('cbb.php?name=' + name, function(response) {
alert(response);
$('#someDiv').html(response);
});
}
or:
//using jQuery's $.load method
function update(name) {
//directly inject div id="someDiv" with output of url
$('#someDiv').load('cbb.php?name=' + name);
}
Putting it together:
//when the DOM is ready
$(document).ready(function() {
//bind to click event of all anchors with class="contact"
$('a.contact').click(function(e) {
//stop the link from being followed
e.preventDefault();
//get the name from the link text
var name = $(this).text();
update(name);
});
});
Timmy
McLovin
<div id="someDiv">This is where the output will be injected</div>
See http://docs.jquery.com/Ajax for more information.

Answer 2

I managed to get the code working by using:
function getFile(fileToOpen) {
var xmlhttp;
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else if (window.ActiveXObject) {
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
} else {
alert("Your browser does not support XMLHTTP!");
}
xmlhttp.open("GET",fileToOpen,false);
xmlhttp.send(null);
alert( xmlhttp.responseText );
}
function contactfunction() {
getFile('scripts/php/cbb.php?pname=');
}
If anyone else has the same problem :)