Javascript Callback Confusion

[David]

Hi,
I was looking at this project and could not understand a part of the javascript.
There is an asmx file in the project called Authentication. It has a method IsLoggedIn:

[ScriptService]
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Authentication : WebService
{
   [WebMethod]
    public bool IsLoggedIn()
    {
        return Context.User.Identity.IsAuthenticated;
    }
}

In the file ToolTip.aspx, that method is called as such:

<telerik:RadCodeBlock runat="server" ID="RadCodeBlock1">
    <script type="text/javascript">

    function OnClientBeforeShow(sender, eventArgs)
    {
        Authentication.IsLoggedIn(successfulAuthCallback, failedAuthCallback, eventArgs);
    }

    function successfulAuthCallback(isLoggedInResult,eventArgs) {

        if (isLoggedInResult != true)
        {
            // reload the entire page so the Forms Auth will see that the cookie has expired and redirect to login
            window.location.reload(true);
        }
    }

    function failedAuthCallback(result, eventArgs)
    {
        alert("Auth Callback failed: Reason -- " + result);
    }
    </script>
</telerik:RadCodeBlock>

My confusion stems from the fact that:

1. IsLoggedIn has no formal parameters. However, it is being passed 3 parameters.
2. I cannot see wheresuccessfulAuthCallback is being passed 2 parameters. It has two parameters. But where are they being passed to it.

Cheers

[Svetlina Anati]

Hello David,

 The callback functions you ask about are actually not passed across the wire, it's just "forwarded" on to the client side callback functions after the call completes. This is how things work in general and it is directly related to RadToolTipManager - more information is available in the net, e.g below:

http://geekswithblogs.net/bcaraway/archive/2007/06/02/112942.aspx

Best wishes,
Svetlina
the Telerik team

[David]

Thanks Svetlina.

That blog post did clear it up for me.