Single button
Any single .btn can be turned into a dropdown toggle with some markup changes. Here’s how you can put them to work with either <button> elements:
Split button
Similarly, create split button dropdowns with virtually the same markup as single button dropdowns, but with the addition of .dropdown-toggle-split for proper spacing around the dropdown caret.
Sizing
Button dropdowns work with buttons of all sizes, including default and split dropdown buttons.
Dropup
Trigger dropdown menus above elements by adding .dropup to the parent element.
Dropright
Trigger dropdown menus at the right of the elements by adding .dropend to the parent element.
Disabled
Add .disabled to items in the dropdown to style them as disabled.
Headers
Add a header to label sections of actions in any dropdown menu.
Dividers
Separate groups of related menu items with a divider.
Text
Place any freeform text within a dropdown menu with text and use spacing utilities. Note that you’ll likely need additional sizing styles to constrain the menu width.
