Hi,

Don't know if it helps but we have a servlet that processes the fileupload
and then redirects to another servlet with /some/code
And that servlet is the one responding to the form just by writing a JSON
string on the writer.
In the FormCompleteHandler you can parse the JSON or check for errors.

2010/3/15 fletcher <fle...@fletchowns.net>

> Hello -
>
> I'm trying to create a file upload form that writes to Blobstore.
> Let's say my form has two inputs, one of type file, and another, of
> type text. We'll call the text input the Caption. When the form gets
> submitted via an XMLHttpRequest from Javascript, I want to be able to
> say there was a problem with the Caption without having to refresh or
> redirect the page. Is there any way to do this on App Engine? Or do I
> need to split up my ajaxy forms and my file upload forms?
>
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