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Dropdowns

Toggle contextual overlays for displaying lists of links and more with the Bootstrap dropdown plugin

Overview

Dropdowns are toggleable, contextual overlays for displaying lists of links and more. Like overlays, Dropdowns are built using a third-party library Popper.js, which provides dynamic positioning and viewport detection.

Accessibility

The WAI ARIA standard defines a role="menu" widget, but it's very specific to a certain kind of menu. ARIA menus, must only contain role="menuitem", role="menuitemcheckbox", or role="menuitemradio".

On the other hand, Bootstrap's dropdowns are designed to more generic and application in a variety of situations. For this reason we don't automatically add the menu roles to the markup. We do implement some basic keyboard navigation, and if you do provide the "menu" role, react-bootstrap will do its best to ensure the focus management is compliant with the ARIA authoring guidelines for menus.

Examples

Single button dropdowns

The basic Dropdown is composed of a wrapping Dropdown and inner <DropdownMenu>, and <DropdownToggle>. By default the <DropdownToggle> will render a Button component and accepts all the same props.

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Since the above is such a common configuration react-bootstrap provides the <DropdownButton> component to help reduce typing. Provide a title prop and some <DropdownItem>s and you're ready to go.

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DropdownButton will forward Button props to the underlying Toggle component

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Split button dropdowns

Similarly, You create a split dropdown by combining the Dropdown components with another Button and a ButtonGroup.

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As with DropdownButton, SplitButton is provided as convenience component.

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Sizing

Dropdowns work with buttons of all sizes.

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Dark dropdowns

Opt into darker dropdowns to match a dark navbar or custom style by adding variant="dark" onto an existing DropdownMenu. Alternatively, use menuVariant="dark" when using the DropdownButton component.

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Using menuVariant="dark" in a NavDropdown:

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Drop directions

Trigger dropdown menus above, below, left, or to the right of their toggle elements, with the drop prop.

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Historically dropdown menu contents had to be links, but that’s no longer the case with v4. Now you can optionally use <button> elements in your dropdowns instead of just <a>s.

You can also create non-interactive dropdown items with <Dropdown.ItemText>. Feel free to style further with custom CSS or text utilities.

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By default, a dropdown menu is aligned to the left, but you can switch it by passing align="end" to a <Dropdown>, <DropdownButton>, or <SplitButton>.

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Responsive alignment

If you want to use responsive menu alignment, pass an object containing a breakpoint to the align prop on the <DropdownMenu>, <DropdownButton>, or <SplitButton>. You can specify start or end for the various breakpoints.

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Add a header to label sections of actions.

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Separate groups of related menu items with a divider.

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AutoClose

By default, the dropdown menu is closed when selecting a menu item or clicking outside of the dropdown menu. This behaviour can be changed by using the autoClose property.

By default, autoClose is set to the default value true and behaves like expected. By choosing false, the dropdown menu can only be toggled by clicking on the dropdown button. inside makes the dropdown disappear only by choosing a menu item and outside closes the dropdown menu only by clicking outside.

Notice how the dropdown is toggled in each scenario by clicking on the button.

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Customization

If the default handling of the dropdown menu and toggle components aren't to your liking, you can customize them, by using the more basic <Dropdown> Component to explicitly specify the Toggle and Menu components

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Custom Dropdown Components

For those that want to customize everything, you can forgo the included Toggle and Menu components, and create your own. By providing custom components to the as prop, you can control how each component behaves. Custom toggle and menu components must be able to accept refs.

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API

SplitButton