As an aside, how is the jquery-fileupload thing? I was reading about it, and when I saw there was some weird iframe thing for IE... I closed the page and walked away. That kind of thing looks like it could be a nightmare if something goes wrong.
The iframe transport method for uploads is useful for browsers that don't support XHR file uploads (basically IE < 10). You can read more a bit about how it works in: https://github.com/blueimp/jQuery-File-Upload/wiki/Frequentl... or directly in the source: https://github.com/blueimp/jQuery-File-Upload/blob/master/js... (it's pretty small).
I don't have a good answer: Fine to program with, but certainly took some doing for our particular need. (We had a number of requirements that made the "easy" out-of-the-box jquery-fileupload not suitable.)
Ask me in a couple of months and I'll probably have a lot of opinions to give.
> and when I saw there was some weird iframe thing for IE... I closed the page and walked away.
We are migrating customers from a C++ desktop app to a web interface: So anyone on old IE with problems will be informed that they're not supported on the new system, so keep using the old and let us know after they upgrade. :) (Newer IE is OK.)
Deviously, this also prevents absolutely everyone from ditching the old app and swamping the new system on day 1.