On my submit button, what I'd like to do is OnClick show a Please wait panel and hide the button, UNLESS the validators say something's invalid - then I need the buttons still showing obviously. Otherwise I have a validation summary showing erros and no way to submit again.

Most articles I find about doing this want to use Page_ClientValidate() function to tell the page to validate itself, but this comes back undefined for me, as does Page_IsValid variable. Here is the function I'm trying to use - what am I missing?:

function PleaseWaitShow() {

    try {

        alert(PleaseWaitShow());



        var isPageValid = true;



        // Do nothing if client validation is not active

        if (typeof(Page_Validators) == undefined) {

            if (typeof(Page_ClientValidate) == 'function') {

                isPageValid = Page_ClientValidate();

                alert(Page_ClientValidate returned:  + isPageValid);

                alert(Page_IsValid= + Page_IsValid);

            } else {

                alert(Page_ClientValidate function undefined);

            }

        } else {

            alert(Page_Validators undefined);

        }



        if(isPageValid) {

            // Hide submit buttons

           document.getElementById('pnlSubmitButton').style.visibility = 'hidden';

           document.getElementById('pnlSubmitButton').style.display = 'none';



           // Show please wait panel

           document.getElementById('pnlPleaseWait').style.visibility = 'visible';

           document.getElementById('pnlPleaseWait').style.display = 'block';

       } else {

           alert(page not valid - don't show please wait);

       }

   } catch(er) {

       alert(ERROR in PleaseWaitShow():  + er);

   }

}