RE: Check Username Availability in ASP.Net using AJAX PageMethods

Try

 PageMethods.CheckUserName(document.getElementById("<%=txtUserName.LoginID%>").value, OnSuccess); 

Hey! :) i Have tried your code.. but there still error :(

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS1061: 'System.Web.UI.WebControls.TextBox' does not contain a definition for 'LoginID' and no extension method 'LoginID' accepting a first argument of type 'System.Web.UI.WebControls.TextBox' could be found (are you missing a using directive or an assembly reference?)

PageMethods.CheckUserName(document.getElementById("<%=txtUserName.ClientID%>").value, OnSuccess); 

I have tried your code..

but there is still error.

when i put a name inside the textbox...

"Error occured" will appear..

Please help me! Thanks :D

    <script type = "text/javascript">
        function ShowAvailability() {
            PageMethods.CheckUserName(document.getElementById("<%=txtUserName.ClientID%>").value, OnSuccess);
        }
        function OnSuccess(response) {
            var mesg = document.getElementById("mesg");
            switch (response) {
                case "true":
                    mesg.style.color = "green";
                    mesg.innerHTML = "Available";
                    break;
                case "false":
                    mesg.style.color = "red";
                    mesg.innerHTML = "Not Available";
                    break;
                case "error":
                    mesg.style.color = "red";
                    mesg.innerHTML = "Error occured";
                    break;
            }
        }
        function OnChange(txt) {
            document.getElementById("mesg").innerHTML = "";
        }
</script> 

So debug your server side code and check, there is some error occuring