[TYPO3-dev] Custom TCA formeval

[Jeff Segars]

I recently came across a great new feature in 4.0...the ability to 
define custom evaluation functions for backend forms in both Javascript 
and PHP.  There are some details on the bugtracker at 
http://bugs.typo3.org/view.php?id=1639.

I can see how to change user submitted values using these functions but 
I'm not clear on whether its possible to generate a form validation 
errors with it.  I'd like to be able to check input with my custom 
evaluation, then display the yellow exclamation mark if I detect a 
problem with the input.

Any pointers on whether this is possible?  (Ingmar, Thomas, etc?)

Thanks,
Jeff