I am facing a problem while applying ajax in my login script.
My login form is :
<form action="" id="contactform" onsubmit="return loadXMLDoc();">
<div id= "login">
<font face="Georgia" size="-1">
<input type='button' id='button' name='login_user' value='Login' onclick='loadXMLDoc();'/>
</form>
<span id="txtHint"></span>
Ajax code is:
<script type="text/javascript">
var ajaxRequest;
function ajaxFunction(){
try{
ajaxRequest = new XMLHttpRequest();
}catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){
alert("Your browser broke!");
return false;
}
}
}
}
function processRequest() {
if (req.readyState == 4) {
var ajaxDisplay = document.getElementById('txtHint');
ajaxDisplay.value = ajaxRequest.responseText;
}
}
function loadXMLDoc() {
ajaxFunction();
// Here processRequest() is the callback function.
var url = 'login.php';
if (!target) var target = document.getElementById("textfield").value;
if (!target1) var target1 = document.getElementById("textfield2").value;
var mainurl = url + "?uname=" + target;
mainurl = mainurl + "&pass=" + target1;
mainurl = mainurl + "&login=" + '1';
alert(mainurl);
ajaxRequest.open("POST", mainurl, true);
ajaxRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
ajaxRequest.onreadystatechange = processRequest;
ajaxRequest.send(mainurl);
}
</script>
Now, whenever I click login button, nothing happens. I have checked url and it shows login.php?uname=&pass=&login=1
The script is not able to call login.php
login.php is [kept simple for testing]
<?php
// makes sure they filled it in
if((!$_GET['uname']) || ($_GET['uname']=='') || (!$_GET['pass']) || ($_GET['pass']=='')) {
$response="Please fill";
?>
<script type="text/javascript">
alert('please fill');
</script>
<?php
echo $response;
die(); }
?>
After clicking login button....I am getting any of the messages...
please help... 
