Restrict attaching big files using Javascript

Question

How can we restrict users from attaching file bigger than specified size (to say 20MB). I do have a check at the server side to show errors in case of big files received on the server but that happens too late.

I want to achieve something like gmail, where you get a quick alert specifying

"This file exceeds the 25MB attachment limit. Sorry."

Thanks!

Pratik

Answer 1

Javascript does not have access to this kind of information, but a tool like swfupload can give you nice javascript api's to access this information with flash.

http://swfupload.org/