Jquery username availability problem

Question

1.00/5 (1 vote)

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on blank textbox Jquery username availability showing "Available" i'm cheking availability on keyup event.

my code is

C#

[System.Web.Services.WebMethod]
    public static string CheckUserName(string userName)
    {
        string returnValue = string.Empty;
        try
        {
            string SqlConnect = System.Configuration.ConfigurationManager.ConnectionStrings["Connect"].ConnectionString;
            SqlConnection Sqlconn = new SqlConnection(SqlConnect); 
            SqlCommand cmd = new SqlCommand("spx_CheckUserAvailability",Sqlconn);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@UserName", userName.Trim());
            Sqlconn.Open();
            returnValue = cmd.ExecuteScalar().ToString();
            Sqlconn.Close();
        }
        catch
        {
            returnValue = "error";
        }
        return returnValue;
    }

source part-

HTML

<script src="js/jquery-1.3.2.min.js"type="text/javascript"></script>


 
      <script type = "text/javascript">
     function ShowAvailability() {

    $.ajax({
        type: "POST",
        url: "Signup.aspx/CheckUserName",
        data: '{userName: "' + $("#<%=TextBox4.ClientID%>")[0].value + '" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: OnSuccess,
        failure: function(response) {
            alert(response);
        }
    });
}

function OnSuccess(response) {
    var mesg = $("#mesg")[0];

    switch (response.d) {
        case "true":
            mesg.style.color = "green";
            mesg.innerHTML = "<img src='image/tick.png' width='13px' height='13px'> Available";
            
            break;
        case "false":
            mesg.style.color = "red";
            mesg.innerHTML = "<img src='image/unavailable.png' width='13px' height='13px'> Not Available";
            break;
        case "error":
            mesg.style.color = "red";
            mesg.innerHTML = "Error occured";
            break;
//        case  "null":
//            mesg.style.color="black";
//            mesg.innerHTML="Fill email ID";
//            break;                     
    }
}
function OnChange(txt) {
   $("#mesg")[0].innerHTML = "";
}
</script>

Posted 20-Oct-12 7:24am

Surendra0x2

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Comments

Sandeep Mewara 20-Oct-12 13:40pm

And the issue is?

Surendra0x2 20-Oct-12 13:42pm

on Keyup if textbox is blank then it is showing available

Sergey Alexandrovich Kryukov 20-Oct-12 22:57pm

Not a question.
--SA

1 solution

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TheCoolCoder · Accepted Answer · 2012-10-22T00:38:00

The right way to do this is to modify your javascript function

C#

function ShowAvailability()

to send ajax calls to server only in case the textbox is having some content.

JavaScript

function ShowAvailability() {
  if($.trim($('#'+'<%=txtUserName.ClientID%>').val())!="")//replace txtUserName with id of your textbox
  {
   //your code.
  }
}

Also you can modify your server side code to include null check.

C#

public static string CheckUserName(string userName)
        {
            string returnValue = string.Empty;
            if ( userName.Trim() != "")
            {
                try
                {
                    string SqlConnect = System.Configuration.ConfigurationManager.ConnectionStrings["Connect"].ConnectionString;
                    SqlConnection Sqlconn = new SqlConnection(SqlConnect);
                    SqlCommand cmd = new SqlCommand("spx_CheckUserAvailability", Sqlconn);
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.AddWithValue("@UserName", userName.Trim());
                    Sqlconn.Open();
                    returnValue = cmd.ExecuteScalar().ToString();
                    Sqlconn.Close();
                }
                catch
                {
                    returnValue = "error";
                }
            }
            else
                returnValue = "null";
            return returnValue;
        }