Question

I’m trying to submit a form using JQuery. My problem comes from the fact that the front end (html+js/jquery) and the back-end is not on the same site, but it does support JSONP.

The form contains a file input field, so I would be submitting Multi-part form data.
How would you resolve this?

Answer 1

your form action would point to the site controlling the post.

<form id="theForm" action="http://someurltoaformsubmitfunction" method="post">

then you can call
$('#theForm').submit();