[FEATURE] Add repeatable rows

[thommyhh]

The extension was a great starting point, I found the behaviour of duplicating the whole container quite strange. So I decided to improve it - from my point of view - by introducing an extra level, the RepeatableRow. With this change, the elements configured are wrapped inside a RepeatableRow first. The row is then duplicated.

This changed behaviour was inspired the the Symfony Forms Collection type, which indeed is a very useful extension to the TYPO3 form framework.

I've also adjusted - or more completely rewritten - the javascript code. It does not depend on jQuery or any other framework anymore and comes with two variants:

• A pure implementation which exposes the functionality to the global namespace
• A bundle which already handles the initialization

I updated the README, so please take a look at https://github.com/webcoast-dk/repeatable_form_elements/tree/feature/add-repeatable-rows

Because of those drastic changes, I see this as a v3.0.0.

I hope this contribution is appreciated. I'm open for questions and discussion, either here or in the TYPO3 slack (@Thorben Nissen)

[chrosey]

Thanks for your efforts @thommyhh.

As far as I understand, your underlying idea is not to copy the “Repeatable Container”, but the “Repeatable Row” inside it.

This approach is further nesting in my view. For me, the “Repeatable Container” already corresponds to what I understand from you as “Repeatable Row”. I could currently achieve the same goal by creating a “Fieldset” in the form editor and a “Repeatable Container” in it. The difference for me is the naming.

Have I understood your approach correctly or what is the deeper idea here?