[development] ahah, drupal_json, file_uploads....

[Darrel O'Pry]

So I've ran into an interesting issue, and wanted to solicit feedback from
people more involved with ahah/ajax development for drupal than I....

http://malsup.com/jquery/form/#code-samples -- see the file uploads tab and
the information regarding json/javascript responses.

The concrete issue I'm dealing with is the Add another item button for
CCK...  For Filefield if you've selected a file to upload and press the 'Add
Another Item' button you get an error. You get this error because
drupal_json sets the text/javascript header, and the iframe doesn't accept
that...

This issue can be solved easily just by having CCK's ahah handler simply
print drupal_to_js instead of using drupal json.  This however will not
solve more systemic issues with people adding file uploads to other ajax
handled forms.

There are a couple solutions I can think of...
   1) have ahah set the iframe option to true and use iframes, and add the
textarea to drupal_json.
   2) check the _SERVER['HTTP_ACCEPT'] and decide which header to set
whether to wrap output in a textarea
   3) hack around it on a case by case basis

I was hoping some of the more jquery ahah astute might have better
suggestions for achieveing some kind of consistency.
We should probably add $_GLOBAL['devel_shutdown'] = FALSE to drupal_json
regardless...


.darrel.
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