Dropdown menus are toggleable, contextual menus, used for displaying links in a list format. It facilitates users to choose one value from a predefined list. This can be made interactive with the dropdown JavaScript plugin.
The .dropdown class indicates a dropdown menu.
To open the dropdown menu, use a button or a link with a class of .dropdown-toggle and thedata-toggle="dropdown" attribute.
The .caret class creates a caret arrow icon (), which indicates that the button is a dropdown.
Add the .dropdown-menu class to a <ul> element to actually build the dropdown menu.
The .divider class is used to separate links inside the dropdown menu with a thin horizontal border:
The .dropdown-header class is used to add headers inside the dropdown menu:
Highlight a specific dropdown item with the .active class (adds a blue background color).
To disable an item in the dropdown menu, use the .disabled class (gets a light-grey text color and a "no-parking-sign" icon on hover):
To right-align the dropdown, add the .dropdown-menu-right class to the element with .dropdown-menu:
If you want the dropdown menu to expand upwards instead of downwards, change the <div> element with class="dropdown" to "dropup":
