How to Filter Topics By Topics

Filter Topics By Topics is a basic method for filtering specific topics in a Multi-Topic Question (Single Choice Grid Question), according to answers selected in topics of another Multi-Topic question.

How to Do It:

1. First, let’s create two Multi-Topic Questions.
   The first question, for our example, will have 4 topics, each one can be selected with an answer ‘true’ or ‘false’:
   

    

2. Our other question, will have the same amount of topics, with a different set of answers:
   

    

3. Now, let’s configure the Filtering script, we will need to write it in the start script in the question we want to filter – so lets choose Question 2, to be filtered according to question 1.
   

    

   I have written the following script, in the start script of question 2:
   FilterTopicsByTopics(CurrQues,1,1);

   1^st Parameter: The Target Question.

   2^nd Parameter: The Source Question.
   3^rd Parameter: Index’s of answers from the source question. (Can add several values and separate them with a comma)

    

   This will basically show only topics that their corresponding topics in question one, were answered with answer 1, ‘true’.
   For example, In question 1 I answered ‘true’ for topics 2 and 4:
   

   And now, in question number 2, I get only topics 2 and 4:
   

4. If you wish to show topics that were NOT answered with the values you specified, you should change the script to be like this:
   FilterTopicsByTopics(CurrQues,false,1,1);

   1^st Parameter: Target Question.

   2^nd Parameter: ‘false’ for doing the negative function.
   3^rd Parameter: Source Question.
   4^th Parameter: Index’s of answers from the source question. (Can add several values and separate them with a comma)

   
   And as you can see, this will bring the topics which did NOT have the values we specified:
   

That’s it!