Bootstrap Button Dropdowns
This chapter will discuss about how to add dropdown menu to buttons using Bootstrap classes. To add a dropdown to a button, simply wrap the button and dropdown menu in a .btn-group. You can also use <span class="caret"></span> to act as an indicator that the button is a dropdown.
The following example demonstrates a basic single button dropdowns:
<div class="btn-group">
<button type="button" class="btnbtn-default dropdown-toggle"
data-toggle="dropdown">
Default <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
<div class="btn-group">
<button type="button" class="btnbtn-primary dropdown-toggle"
data-toggle="dropdown">
Primary <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
Split Button Dropdowns
Split button dropdowns use the same general style as the dropdown button but add a primary action along with the dropdown. Split buttons have the primary action on the left and a toggle on the right that displays the dropdown.
<div class="btn-group">
<button type="button" class="btnbtn-default">Default</button>
<button type="button" class="btnbtn-default dropdown-toggle"
data-toggle="dropdown">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
<div class="btn-group">
<button type="button" class="btnbtn-primary">Primary</button>
<button type="button" class="btnbtn-primary dropdown-toggle"
data-toggle="dropdown">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
Button Dropdown Size
You can use the dropdowns with any button size: .btn-large, .btn-sm, or .btn-xs.
<div class="btn-group">
<button type="button" class="btnbtn-default dropdown-toggle btn-lg"
data-toggle="dropdown">
Default <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
<div class="btn-group">
<button type="button" class="btnbtn-primary dropdown-toggle btn-sm"
data-toggle="dropdown">
Primary <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
<div class="btn-group">
<button type="button" class="btnbtn-success dropdown-toggle btn-xs"
data-toggle="dropdown">
Success <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
Dropup variation
Menus can also be built to drop up rather than down. To achieve this, simply add .dropup to the parent .btn-group container.
<div class="row" style="margin-left:50px; margin-top:200px">
<div class="btn-group dropup">
<button type="button" class="btnbtn-default dropdown-toggle"
data-toggle="dropdown">
Default <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
<div class="btn-group dropup">
<button type="button" class="btnbtn-primary dropdown-toggle"
data-toggle="dropdown">
Primary <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</div>
</div>
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