Hidden mandatory fields

Hi,

I’m using JS to hide and show fields, depending on some logic before. Due to some circumstances I can’t use the standards of Qualtrics (display logic etc.).

Now I’d like to add some mandatory fields. Unfortunately the system behaves the way it should: It asks for the mandatory answer, even though the field is currently hidden. 

Does anybody know:

• Is there a way to programmatically make a field mandatory?
• Or skip mandatory check when a field is hidden?
• Or add some JS mandatory check without using Qualtrics mandatory rules?

Would be great to get in discussion with you :-)!

Thanks!