How to prevent user input in Matrix table?

Hi all,

I have a matrix table with 15 rows and three columns of text input fields. In each field, I defined default choices using piped text.
How can I prevent users from changing these default choices and simply use the matrix table as an overview table?

I tried:

jQuery("#"+this.questionId+" .InputText").prop("readonly", true);

That did not do the trick.

Best