Adding a slide effect to bootstrap dropdown

I’m using bootstrap, and I’d like to add animation to a dropdown. I want to add an animation to it, slide down and back up when leaving it. How could I do this?

Things I tried:

Changing the Js drop down file like this:

How can I make Bootstrap’s navigation dropdown slide smoothly up and down?

Answer

If you update to Bootstrap 3 (BS3), they’ve exposed a lot of Javascript events that are nice to tie your desired functionality into. In BS3, this code will give all of your dropdown menus the animation effect you are looking for:

  // Add slideDown animation to Bootstrap dropdown when expanding.
  $('.dropdown').on('show.bs.dropdown', function() {
    $(this).find('.dropdown-menu').first().stop(true, true).slideDown();
  });

  // Add slideUp animation to Bootstrap dropdown when collapsing.
  $('.dropdown').on('hide.bs.dropdown', function() {
    $(this).find('.dropdown-menu').first().stop(true, true).slideUp();
  });

You can read about BS3 events here and specifically about the dropdown events here.