Question

140

Calling VB.NET WebMethod Function from Javascript

rated 0 times [ 147] [ 7] / answers: 1 / hits: 23542 / 13 Years ago, tue, july 12, 2011, 12:00:00

I have a VB.NET function which looks like this:

<WebMethod()> _

Public Shared Function AuthenticateUser(ByVal UserInfo As String, ByVal Password As String) As Boolean

    Dim UserName As String



    'Just in case

    AuthenticateUser = False



    'Extract the user name from the user info cookie string

    UserName = Globals.GetValueFromVBCookie(UserName, UserInfo)



    'Now validate the user

    If Globals.ValidateActiveDirectoryLogin(Backoffice, UserName, Password) Then

        AuthenticateUser = True

    End If



End Function

I'm trying to call it from javascript like this:

function DeleteBatchJS()

{if (confirm(Delete the ENTIRE batch and all of its contents? ALL work will be lost.))

     var authenticated = PageMethods.AuthenticateUser(get_cookie(UserInfo), prompt(Please enter your password))

     if (authenticated == true)

           {{var completed = PageMethods.DeleteBatchJSWM(get_cookie(UserInfo));

            window.location = BatchOperations.aspx;

            alert(Batch Deleted.);}}}

It calls the function, but won't return a value. When walking through the code, my VB function does fire (it will return true so long as the correct password is typed in), but the javascript 'authenticated' value remains 'undefined'. It's like you can't return values from VB functions to javascript.

I also tried

if PageMethods.AuthenticateUser(UserName, Password)

   {

     //Stuff

   }

But still no luck.

What am I doing wrong?

Thanks,

Jason

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brendan

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3 Years ago

answered 13 Years ago marisela · Accepted Answer

Web methods are invoked using AJAX, i.e. asynchronously, i.e. you have to wait until the method completes before consuming the results, i.e. you have to use the success callbacks:

function DeleteBatchJS() {

    var shouldDelete = confirm('Delete the ENTIRE batch and all of its contents? ALL work will be lost.');

    if (!shouldDelete) {

        return;

    }



    var password = prompt('Please enter your password');

    var userInfo = get_cookie('UserInfo');

    PageMethods.AuthenticateUser(

        userInfo, 

        password,

        function(result) {

            // It's inside this callback that you have the result

            if (result) {

                PageMethods.DeleteBatchJSWM(

                    userInfo,

                    function(data) {

                        // It's inside this callback that you know if

                        // the batch was deleted or not

                        alert('Batch Deleted.');

                        window.location.href = 'BatchOperations.aspx';

                    }

                );

            }

        }    

    );

}