Hello everyone,
I am creating a form with many accordion field groups. I wish to have a green check mark appear on the right side of the accordion field group item when all the fields within the field group are filled out. Or at least the background color of the accordion title changed. This is useful to keep track of the filled out field groups.

I researched if there are modules for that, so far could not find. I am thinking to use js injector, not sure how to go about it. I am not experienced in Javascript and Drupal 7

What is the best way to accomplish it? Step-by-step explanation would be most appreciated.