I have a drop down field with values A, B, C, D, and E and various check boxes which are yes/no question grouped based on drop down values like 5 questions for A, 3 questions for B, etc.. The drop down values are in order, meaning D comes after C, C comes after B and so on. How do i automatically check the all check boxes when lets say C is selected, i would like to automatically check the A and B check boxes. If B is selected, i would like to automatically check the A check box only. If E is selected I would like to automatically check all A B C and D check boxes.
JavaScript to check checkbox(es) on different drop down selection
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