Dropdown
Toggle contextual overlays for displaying lists of links and more with the Bootstrap dropdown plugin.
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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.
We use this extra class to reduce the horizontal padding on either side of the caret by 25% and remove the margin-left that’s added for regular button dropdowns. Those extra changes keep the caret centered in the split button and provide a more appropriately sized hit area next to the main button.
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
Dropleft
Trigger dropdown menus at the left of the elements by adding .dropstart to the parent element.
Responsive alignment
If you want to use responsive alignment, disable dynamic positioning by adding the data-bs-display="static" attribute and use the responsive variation classes.
To align right the dropdown menu with the given breakpoint or larger, add .dropdown-menu{-sm|-md|-lg|-xl|-xxl}-end.
To align left the dropdown menu with the given breakpoint or larger, add .dropdown-menu-end and .dropdown-menu{-sm|-md|-lg|-xl|-xxl}-start.
Alignment options
Taking most of the options shown above, here’s a small kitchen sink demo of various dropdown alignment options in one place.
Dropdown options
Use data-bs-offset or data-bs-reference to change the location of the dropdown.
Auto close behavior
By default, the dropdown menu is closed when clicking inside or outside the dropdown menu. You can use the autoClose option to change this behavior of the dropdown.