jquery - Disable page on Javascript submit (during file download) -

i've looked , don't see way disable page, overlay on page prevent action when have javascript submit action:

 function agendaminutes() {     var id = '@model.id';     var form = $('<form method="post" action="agendaminutes">');     form.append($('<input type="hidden" name="dprid" value="' + id + '">'));     $(body).append(form);     form.submit().remove();     return false; } 

this works charm in generating , sending pdf client, allows user click button more once. disable button how know when pdf has been returned can release it?

but how know when pdf has been returned [so can re-enable page]

the simplest option downloading file , "knowing" when complete send file new window/tab via target="_blank".

this way, user gets progress indicator (via browser) , page doesn't need know when it's completed (as other tab handles it) can be re-enabled immediately.

if page needs wait reason, eg document must generated before continuing, alternative solution require: in case, i'd generate and persist file on server, provide download link client.