I have a field group for options page.
Here I have two radio button fields with several options and a checkbox field.
Now I want to have a fourth field, a result field. If for example the first field is option 1 and the second field option 3 then output a certain value (1_3) . and if the check box field is active then another value.
(one_three_check). how can I solve something like this, or where does the programme code have to be?