[TYPO3-project-seminars] Best practice to implement BE-preprocessing in a FE plugin

[Taras Sajuk]

Hi all,

Im working on a FE (content) Plugin.  The user should be able to enter data
in the plugin form, a File handle to be more specific, and this data should
be processed immediately in the BE - storing some excerpt of the file in the
extensions table.

However, I only see the possibility to store some validated data or to call
own processing _before_ user input in BE, to fill some selection list.

Is there a best practice to call extension processing on user input in BE?

-- 
Taras Sajuk