How to make string field Mandatory when survey questions are answered?

[deepikarama]

I am trying to make a string field in a survey mandatory when a user selects Poor or Very Poor for any of the smiley-rating questions.

The survey contains four questions, each with a 5-point smiley rating. If the user selects Poor or Very Poor for any of these questions, the string field should become mandatory. Otherwise, the string field should remain visible but not mandatory.

[Ankur Bawiskar]

@deepikarama 

you can show/hide question based on previous survey question value

but you can't make it mandatory/non-mandatory based on previous question value

Approach

Create two-comment-fields : one comment question is shown only for low ratings and is mandatory, while the other is shown for non-low ratings and is optional

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