Hi,
Is there a way to do an array filter with a one-to-many relationship?

Question 1
-Article 1
-Article 2

Question2
-Ref 1
-Ref 2
-Ref 3
-Ref 4

The user choose "Article 1" and "Ref 2", "Ref 4" is showing.

The user choose "Article 2" and "Ref 1", "Ref 2", "Ref 3" is showing.

Thanks

See manual.limesurvey.org/Adding_answers_or_subquestions (Relevance)

Thanks for your guidance but I will do it in JavaScript.
Too much conditions to check.

You have to test exactly same condition in javascript .....