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<div class="bs-docs-section">
<h1 id="dropdowns" class="page-header">Dropdowns <small>dropdown.js</small></h1>
<h2 id="dropdowns-examples">Examples</h2>
<p>Add dropdown menus to nearly anything with this simple plugin, including the navbar, tabs, and pills.</p>
<h3>Within a navbar</h3>
<div class="bs-example">
<nav id="navbar-example" class="navbar navbar-default navbar-static">
<div class="container-fluid">
<div class="navbar-header">
<button class="navbar-toggle collapsed" type="button" data-toggle="collapse" data-target=".bs-example-js-navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Project Name</a>
</div>
<div class="collapse navbar-collapse bs-example-js-navbar-collapse">
<ul class="nav navbar-nav">
<li class="dropdown">
<a id="drop1" href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown
<span class="caret"></span>
</a>
<ul class="dropdown-menu" aria-labelledby="drop1">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
<li class="dropdown">
<a id="drop2" href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown
<span class="caret"></span>
</a>
<ul class="dropdown-menu" aria-labelledby="drop2">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li id="fat-menu" class="dropdown">
<a id="drop3" href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown
<span class="caret"></span>
</a>
<ul class="dropdown-menu" aria-labelledby="drop3">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div><!-- /.nav-collapse -->
</div><!-- /.container-fluid -->
</nav> <!-- /navbar-example -->
</div> <!-- /example -->
<h3>Within pills</h3>
<div class="bs-example">
<ul class="nav nav-pills" role="tablist">
<li role="presentation" class="active"><a href="#">Regular link</a></li>
<li role="presentation" class="dropdown">
<a id="drop4" href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown
<span class="caret"></span>
</a>
<ul id="menu1" class="dropdown-menu" aria-labelledby="drop4">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
<li role="presentation" class="dropdown">
<a id="drop5" href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown
<span class="caret"></span>
</a>
<ul id="menu2" class="dropdown-menu" aria-labelledby="drop5">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
<li role="presentation" class="dropdown">
<a id="drop6" href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown
<span class="caret"></span>
</a>
<ul id="menu3" class="dropdown-menu" aria-labelledby="drop6">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul> <!-- /pills -->
</div> <!-- /example -->
<h2 id="dropdowns-usage">Usage</h2>
<p>Via data attributes or JavaScript, the dropdown plugin toggles hidden content (dropdown menus) by toggling the <code>.open</code> class on the parent list item.</p>
<p>On mobile devices, opening a dropdown adds a <code>.dropdown-backdrop</code> as a tap area for closing dropdown menus when tapping outside the menu, a requirement for proper iOS support. <strong class="text-danger">This means that switching from an open dropdown menu to a different dropdown menu requires an extra tap on mobile.</strong></p>
<p>Note: The <code>data-toggle="dropdown"</code> attribute is relied on for closing dropdown menus at an application level, so it's a good idea to always use it.</p>
<h3>Via data attributes</h3>
<p>Add <code>data-toggle="dropdown"</code> to a link or button to toggle a dropdown.</p>
{% highlight html %}
<div class="dropdown">
<button id="dLabel" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown trigger
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dLabel">
...
</ul>
</div>
{% endhighlight %}
<p>To keep URLs intact with link buttons, use the <code>data-target</code> attribute instead of <code>href="#"</code>.</p>
{% highlight html %}
<div class="dropdown">
<a id="dLabel" data-target="#" href="http://example.com/" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
Dropdown trigger
<span class="caret"></span>
</a>
<ul class="dropdown-menu" aria-labelledby="dLabel">
...
</ul>
</div>
{% endhighlight %}
<h3>Via JavaScript</h3>
<p>Call the dropdowns via JavaScript:</p>
{% highlight js %}
$('.dropdown-toggle').dropdown()
{% endhighlight %}
<div class="bs-callout bs-callout-info" id="callout-dropdowns-data-required">
<h4><code>data-toggle="dropdown"</code> still required</h4>
<p>Regardless of whether you call your dropdown via JavaScript or instead use the data-api, <code>data-toggle="dropdown"</code> is always required to be present on the dropdown's trigger element.</p>
</div>
<h3 id="dropdowns-options">Options</h3>
<p><em>None</em></p>
<h3 id="dropdowns-methods">Methods</h3>
<h4><code>$().dropdown('toggle')</code></h4>
<p>Toggles the dropdown menu of a given navbar or tabbed navigation.</p>
<h3 id="dropdowns-events">Events</h3>
<p>All dropdown events are fired at the <code>.dropdown-menu</code>'s parent element.</p>
<p>All dropdown events have a <code>relatedTarget</code> property, whose value is the toggling anchor element.</p>
<div class="table-responsive">
<table class="table table-bordered table-striped bs-events-table">
<thead>
<tr>
<th>Event Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>show.bs.dropdown</td>
<td>This event fires immediately when the show instance method is called.</td>
</tr>
<tr>
<td>shown.bs.dropdown</td>
<td>This event is fired when the dropdown has been made visible to the user (will wait for CSS transitions, to complete).</td>
</tr>
<tr>
<td>hide.bs.dropdown</td>
<td>This event is fired immediately when the hide instance method has been called.</td>
</tr>
<tr>
<td>hidden.bs.dropdown</td>
<td>This event is fired when the dropdown has finished being hidden from the user (will wait for CSS transitions, to complete).</td>
</tr>
</tbody>
</table>
</div><!-- ./bs-table-responsive -->
{% highlight js %}
$('#myDropdown').on('show.bs.dropdown', function () {
// do something…
})
{% endhighlight %}
</div>
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