ajax check username availability asp.net

Question

4.50/5 (2 votes)

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i tried following code for check user name availability using
xmlhttprequest...
but is not working..
plz tell where i m wrong..

1. check.aspx

C#

protected void Page_Load(object sender, EventArgs e)
   {
       string StuName = Request.QueryString["stuname"] as string;

       if (StuName != null)
       {
           DataTable table = DBHelper.GetStuList(StuName.Trim());

           string result = string.Empty;

           foreach (DataRow r in table.Rows)
           {
               result += r["StuName"].ToString() + ";";
           }

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

2. default.aspx

C#

function Updatename()
{

    xmlHttp = null;

    if(window.XMLHttpRequest)
    {

        xmlHttp = new XMLHttpRequest();
    }
    else if(window.ActiveXObject)
    {

        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }

    if(xmlHttp != null)
    {

        var stuName = document.getElementById('<#=txtStuName.ClientID #>').value;


        xmlHttp.onreadystatechange=state_Change;


        xmlHttp.open("GET","check.aspx?StuName="+stuName,true);
        xmlHttp.send(null);
    }
}


function state_Change()
{
    if (xmlHttp.readyState==4)
    {

        if (xmlHttp.status==200)
        {

            var stuname = xmlHttp.responseText;
            var length = stuname.length;

            alert(stuname)
        }
    }
}

Posted 15-Sep-12 23:08pm

Member 9332883

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Member 9332883 · Accepted Answer · 2012-09-16T02:53:00

1. default.aspx

C#

function test(a)
{
    var xmlhttp;
    if (window.XMLHttpRequest)
    {
      xmlhttp=new XMLHttpRequest();
    }
    else
    {
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange=function()
    {
    if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
         alert(xmlhttp.responseText);
         document.getElementById("txtStuName").innerHTML=xmlhttp.responseText;
         document.getElementById("txtCellNo").innerHTML=xmlhttp.responseText;
    }
}
var url = "check.aspx?UserName=" +a;
xmlhttp.open("GET",url,true);
xmlhttp.send();
}

2. check.aspx

C#

protected void Page_Load(object sender, EventArgs e)
   {
       conn.Open();
       string s = Request.QueryString.Get("UserName").ToString();

       if (!string.IsNullOrEmpty(s))
       {
           string str = "select * from StuInfo where StuName = '" + s + "'";
           cmd = new SqlCommand(str, conn);

           string status = null;

           SqlDataReader dr = cmd.ExecuteReader();
           if (dr.HasRows)
           {
               status = "duplicate uaername";
           }
           else
           {
               status = "username available";
           }

           Response.Write(status);
           conn.Close();

        }
       else
       {
           string status = "Name should not be null";
            Response.Write(status);
       }

   }