Non-ajax upload with multiple uploads and restrictions for filesize and filetypes

I'm used to using a standard form with JavaScript validation, custom captcha... etc. Now I would like to enrich my form with an upload function.

The standard HTML upload functionality doesn't cut it, since I would like:

• support for multiple file uploads
• client-side restrictions for filesize (and feedback if not valid)
• client-side restrictions for certain filetypes (and feedback if not valid)

(It goes without saying that these things would anyway be checked server-side aswell).

Solutions like Uploadify, SWFUpload, Plupload have the functionality that I need, but they will force me to change my setup. From what I've gathered, there are two ways of working:

• Using Uploadify, I could use scriptData to send the values of my form asynchronously to the script that also processes the files. Client-side form validation would work, but开发者_开发技巧 it would cause problems with my custom captcha.
• Using Uploadify, I could also submit the form on completion of the uploads, but that would completely defeat the purpose of the captcha. This would imply that one could upload files, even with a wrong captcha, cluttering the server.

What I'm asking is this:

Is there a way to implement the functionality of Uploadify (or similar) so that it would work just like a traditional input type="file" field on submit of the form?

Maybe I'm thinking too simplistic, but in my view it would be more practical. It would also degrade gracefully on clients without JavaScript / Flash, without extra workarounds.

I've found out that Plupload does that almost exactly:

Plupload Upload + Synchronous form question