Adding a slide effect to bootstrap dropdown

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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.

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