Unable to send data via Ajax to a PHP page

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I'm trying to send the value of a variable number via ajax to a PHP script. But the PHP script is not printing the desired output on opening on a browser. Tried but couldn't find whats wrong here.
Any pointers ?

index.html

XML

<button type="submit" class="btn btn-success" id = 'first' onclick='process();'>Submit</button>

<script>

var number = 0;

function process()
{
number++;

var xhr;

 if (window.XMLHttpRequest) {
    xhr = new XMLHttpRequest();
} else if (window.ActiveXObject) {
    xhr = new ActiveXObject("Microsoft.XMLHTTP");
}

var data = "num=" + number;
xhr.open("POST", "index.php", true);
xhr.send(data);

</script>

index.php

PHP

<?php
session_start();
$number = $_POST['num'];
$_SESSION['numb'] = $number;
echo $_SESSION['numb'] ;
?>

Posted 19-Jun-14 6:00am

Allwin456

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SibeeshKV · Answer 1 · 2014-06-25T23:40:00

Try this using JQuery

C#

jQuery.ajax({
        type: "POST",
        url: "Login.aspx/checkUserNameAvail",
        contentType: "application/json; charset=utf-8",
        data: "{'iuser':'" + userid + "'}",
        dataType: "xml",
        success: function (msg) {
            $(msg).find("Table").each(function () {
                var username = $(this).find('UserName').text();
                if (username != '') {
                    //window.location.replace('/iCalendar.aspx');
                    alert('This username already taken..');
                    $("#reguser").val('');
                    $("#reguser").focus();
                }
                else {
                }
            });
        },
        error: function (d) {
        }
    });