Try this...

HCL Notes/Domino 8.5 Forum (includes Notes Traveler)

Subject:

Try this...

Since you don't want to use XPages, you could just us jQuery.
If you use $.get() or $.ajax(), you can submit data to a server side agent. It is easy to then use .show() to display a wait message or an animated spinner while the ajax call is made, and in the callback function, which is executed after the call is done, you use .hide() to hide the spinner.

Something similar to this:
$.ajax({
url: 'database.nsf/SubmitAgent?OpenAgent',
cache: false
}).done(function(data) {
$('#waitMessage').hide();
});
$('#waitMessage').show();

Feedback response number WEBB9BUV9N created by ~Dan Kikiterobu on 09/24/2013