twbs--bootstrap/docs/javascript/dropdowns.md

layout	title
page	Dropdowns

Add dropdown menus to nearly anything with this simple plugin, including the navbar, tabs, and pills.

Within navbars

Toggle navigation Project Name

• Dropdown
  • Action
  • Another action
  • Something else here
  • Separated link
• Dropdown 2
  • Action
  • Another action
  • Something else here
  • Separated link

• Dropdown 3
  • Action
  • Another action
  • Something else here
  • Separated link

Within pills

• Regular link
• Dropdown
  • Action
  • Another action
  • Something else here
  • Separated link
• Dropdown 2
  • Action
  • Another action
  • Something else here
  • Separated link
• Dropdown 3
  • Action
  • Another action
  • Something else here
  • Separated link

Usage

Via data attributes or JavaScript, the dropdown plugin toggles hidden content (dropdown menus) by toggling the .open class on the parent list item.

On mobile devices, opening a dropdown adds a .dropdown-backdrop as a tap area for closing dropdown menus when tapping outside the menu, a requirement for proper iOS support. This means that switching from an open dropdown menu to a different dropdown menu requires an extra tap on mobile.

Note: The data-toggle="dropdown" attribute is relied on for closing dropdown menus at an application level, so it's a good idea to always use it.

Via data attributes

Add data-toggle="dropdown" to a link or button to toggle a dropdown.

{% highlight html %}

Dropdown trigger

...

{% endhighlight %}

To keep URLs intact with link buttons, use the data-target attribute instead of href="#".

{% highlight html %}

Dropdown trigger

...

{% endhighlight %}

Via JavaScript

Call the dropdowns via JavaScript:

{% highlight js %} $('.dropdown-toggle').dropdown() {% endhighlight %}

data-toggle="dropdown" still required

Regardless of whether you call your dropdown via JavaScript or instead use the data-api, data-toggle="dropdown" is always required to be present on the dropdown's trigger element.

Options

None.

Methods

$().dropdown('toggle')

Toggles the dropdown menu of a given navbar or tabbed navigation.

Events

All dropdown events are fired at the .dropdown-menu's parent element and have a relatedTarget property, whose value is the toggling anchor element.

Event Type	Description
show.bs.dropdown	This event fires immediately when the show instance method is called.
shown.bs.dropdown	This event is fired when the dropdown has been made visible to the user (will wait for CSS transitions, to complete).
hide.bs.dropdown	This event is fired immediately when the hide instance method has been called.
hidden.bs.dropdown	This event is fired when the dropdown has finished being hidden from the user (will wait for CSS transitions, to complete).

{% highlight js %} $('#myDropdown').on('show.bs.dropdown', function () { // do something… }) {% endhighlight %}