Posted by askibinski on December 20, 2012 at 1:42pm
I posted the full description of the problem and code on stackoverflow:
http://stackoverflow.com/questions/13973301/xhr2-upload-using-drupal-7s-...
Normal custom ajax calls and responses are no problem with some custom code. But this one seems tricky. The problem is I'm not sure if it is at all possible within the Drupal ajax framework (without hacking ajax.js / ajax.inc of course).