Jquery File Upload Hidden IFrame

Question

I needed a quick explanation on how to get an AJAX style file upload going using a hidden iframe. Here\'s the portion of the HTML code pertaining to the form:

Answer 1

Well, I've used something like that:

$("#upload_target")[0].contentWindow.document.body.innerHTML

... instead. But the general approach is similar: check this string, and if it's empty, just do nothing (i.e., return immediately). Otherwise proceed with analyzing this json.