[TYPO3-dev] Backend komplex input validation

[Surena Golijani]

Hi everybody,

I'm searching for a possibility to validate the whole input of a user 
who is editing records in the list-module in the backend.

I can evaluate a single field by the TCA eval function. But I have to 
evaluate inputs depending on other inputs, and this seems to be 
impossible with evaluateFieldValue($value,$is_in,&$set) described in the 
TCA/eval section of the doc_core_api.

I might need something like a postProcessHook, which can not only access 
all the fields of the record, but can keep Typo3 from saving the record 
if validation fails.

Additionally I wonder whether it is really not possible to send an error 
message to the backend (other than a little yellow triangle) if 
validation fails?

I'm happy about every hint,
with kind regards
Surena Golijani