GetSurveyData with incomplete questions (matrixInput)

[cwilligv]

Hi @jdtrat , First of all, thanks for writing this package, it's been really useful. Here is my question/issue:

My survey uses the matrixInput type for all the questions, however, the user can only select 2 out of 4 options in each question.

1. Is there a way to check from the server that he has only selected only 2 and show a message otherwise?
2. Once user has completed all questions (and selected only 2 options per question), I get an error when getting the results with the function GetSurveyData. I guess it's because questions are incomplete, any workaround for that?

thanks for your help.

Christian.