Drupal 7! How to set a nested ul class?

Question

Drupal

I am creating a site based on the bootstrap theme, the site has a menu in the menu there is an item in which three sub-items are nested, you need to set the ul attribute of the nested items to the bootsrap class "dropdown-menu", please tell me what function is needed from the drupal api? Trying to create drop down menus!

Answer 1

something like this drupal.stackexchange.com/a/70639/14830

Answer 2

JavaScript not an option?