I'm working on an HTML form that may take a few seconds to submit. I'd like to disable some of the fields in the form after it's submitted.

I can do this in a handler on the form's submit event, but this fires before the form submits. If I disable the controls then, their values aren't included in the post data sent to the server.

I've tried cancelling the submit event in my handler, removing my submit event handler from the form, submitting the form myself via JavaScript, and then disabling the controls, but the problem there is that I need to know which button the user clicked on to submit the form. This information is in the original form submit, but obviously isn't in the one I trigger manually (as no button was clicked).

I could try to copy this information into my manual form submit, but is there a way to run my disabling code after the form submits?