[TYPO3-seminars] How to add extra fields to registration form?

[Jigal van Hemert]

Hi,

I need to add several fields of different types (radiobuttons, 
checkboxes, textareas, plain input fields) to the registration form.

The usual way is to make an extension to add extra fields to the db 
table and somehow add their rendering recipes to the form. The fields 
show up in the BE forms because the TCA definitions are in place, but 
the FE rendering fails.

I stumble on several issues:

- enabling them in TS showRegistrationFields results in a frontend error 
message that it's only allowed to list a subset of the internal fields; 
you can disable this message, but it seems that the check is done on 
purpose...

- adding them to the form.registration.step1.elements definitions 
doesn't seem to work

What is needed to add the extra fields to the registration form?

-- 
Kind regards / Met vriendelijke groet,

Jigal van Hemert.