How to show a “please wait” message while processing an form?

[sergio.gaia (Sérgio Gaia)]

Hey, guys!

Does anybody know how to show a “please, wait while your submitting form” message when uploading big files to the server?

Any suggestions are welcome!

Regards!

[samdark (Alexander Makarov)]

The upload should be done via JavaScript file API: https://developer.mozilla.org/en-US/docs/Web/API/File/Using_files_from_web_applications