I extended the FileValidator so I could validate images, dimensions etc.
I wanted to make use of some new HTML5 features so the image could be validated client side.
The only problem with this is checking the dimensions uses asynchronous methods (onload=function(){}) so you can’t add any errors.
One way to help and make things more flexible would be to use jQuery deferred.
So a validator could return a deferred object which would hold off the successCallbacks until it’s resolved.
thoughts?