XMLHTTP Request status always returning 0

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Hello everyone,

I have one page in which i check availability of users , i have made this through XML Http request in asp.net, the problem is that the status object always returns 0

my code is :

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>

<!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 runat="server">
    <title></title>
    <script type = "text/javascript">

        var xmlhttp;

        function CheckUserNameAvailability() {

            xmlhttp = null;




//            if (username = "" || username.length < 4) {

//                document.getElementById("<%=lblMsg.ClientID%>").innerHTML = "";

//                return false;

//            }



            if (window.XMLHttpRequest) {

                // code for all new browsers

                xmlhttp = new XMLHttpRequest();

            }

            else if (window.ActiveXObject) {

                // code for IE5 and IE6xmlhttp=

                new ActiveXObject("Microsoft.XMLHTTP");

            }

            if (xmlhttp != null) {
                alert("AjaxPageCalled");
                var username = document.getElementById("txtUserName").value;
                alert(username);
                xmlhttp.onreadystatechange = state_Change;


                xmlhttp.open("GET", "AjaxEnginePage.aspx?UserName=" + username, true);

                xmlhttp.send(null);

            }

            else {

                alert("Oops..Your browser does not support XMLHTTP.");

            }

        }



        function state_Change() {

           // alert("state_chage");
            //alert(xmlhttp.readyState);
            //alert(xmlhttp.status);
            if (xmlhttp.readyState == 4) {

                // 4 = "loaded"

                if (xmlhttp.status == 200) {

                    //request was successful

                    //check if username is available and message

                    var lblMesg = document.getElementById("<%=lblMsg.ClientID%>");

                    if (xmlhttp.responseText == "True") {

                        lblMesg.style.color = "Green";

                        lblMesg.innerHTML = "Username available.";

                    }

                    else {

                        lblMesg.innerHTML = "Username already in use.";

                        lblMesg.style.color = "Red";

                    }

                }

                else {

                    alert("Oops..username availability could not be checked.");

                }

            }

        }

    </script>


</head>
<body>
    <form id="form1" runat="server">
    <div>
    <table cellpadding="0" cellspacing="2">

    <tr>

        <td>User Name:</td>

        <td>

            <asp:TextBox ID="txtUserName" runat="server" ></asp:TextBox>

            <asp:Label ID="lblMsg" runat="server"></asp:Label>

        </td>

    </tr>

    <tr>

        <td>Email:</td>

        <td><asp:TextBox ID="txtEmail" runat="server"></asp:TextBox></td>

    </tr>

    <tr>

        <td></td>

        <td><asp:Button ID="btnRegister" runat="server" Text="Register" OnClientClick ="CheckUserNameAvailability();" /></td>

    </tr>

   </table>

    </div>
    </form>
</body>
</html>

Ajax Engine Page.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;

public partial class AjaxEnginePage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        CheckUserNameAvailability();
       
    }
    public void CheckUserNameAvailability()
    {
        if (Request["UserName"] != null)
        {
            string username = Request["UserName"].ToString ();
            string result = "False";
            System.Web.Security.MembershipUser user = Membership.GetUser(username);
            if (user != null)
            {
                result = "False";
            }
            else
            {
                result = "True";
            }

            Response.Clear();
            Response.Write(result);
            Response.End();
        }
    }

}

Please help ..

Regards,
Krunal

Posted 29-Sep-12 3:32am

krunal25

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Comments

Sandeep Mewara 29-Sep-12 10:02am

Is the request hitting your defined page?

[no name] 1-Oct-12 1:06am

yes ... i have inserted a breakpoint on the page ...and it stops at the breakpoint..but dont know why the status always shows 0

1 solution

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Kuthuparakkal · Answer 1 · 2012-09-29T05:55:00

Solution 1

Move your jscript above Head section

Posted 29-Sep-12 5:55am

Kuthuparakkal

Comments

[no name] 1-Oct-12 1:20am

Hi,

it didn't solved my problem, i am getting same output again... Status is 0 still..

please help..