## Bootstrap - Button Dropdown

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#### Single Button Dropdown

Turn a button into a dropdown toggle with some basic markup changes.

    <!-- Single button -->
    <div class="btn-group">
        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Default <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

    <!-- Single button | Change btn-default class to btn-primary -->
    <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Primary <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

#### Split Button Dropdowns

Similarly, create split button dropdowns with the same markup changes, only with a separate button.

    <!-- Split button -->
    <div class="btn-group">
        <button type="button" class="btn btn-default">Default</button>
        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <span class="caret"></span>
            <span class="sr-only">Toggle Dropdown</span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

    <!-- Split button -->
    <div class="btn-group">
        <button type="button" class="btn btn-primary">Primary</button>
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <span class="caret"></span>
            <span class="sr-only">Toggle Dropdown</span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

#### Sizing

Button dropdowns work with buttons of all sizes.

    <!-- Large button group -->
    <div class="btn-group">
        <button class="btn btn-default btn-lg dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Large button <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

    <!-- Small button group -->
    <div class="btn-group">
        <button class="btn btn-default btn-sm dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Small button <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

    <!-- Extra small button group -->
    <div class="btn-group">
        <button class="btn btn-default btn-xs dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Extra small button <span class="caret"></span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

#### Dropup

Trigger dropdown menus above elements by adding `.dropup` to the parent.

    <div class="btn-group dropup">
        <button type="button" class="btn btn-default">Dropup</button>
        <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <span class="caret"></span>
            <span class="sr-only">Toggle Dropdown</span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>

    <div class="btn-group dropup">
        <button type="button" class="btn btn-danger">Dropup</button>
        <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            <span class="caret"></span>
            <span class="sr-only">Toggle Dropdown</span>
        </button>
        <ul class="dropdown-menu">
            <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>
    </div>