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 = "btn btn-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 = "btn btn-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 = "btn btn-default">Default</button>
<button type = "button" class = "btn btn-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 = "btn btn-primary">Primary</button>
<button type = "button" class = "btn btn-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 = "btn btn-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 = "btn btn-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 = "btn btn-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 = "btn btn-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 = "btn btn-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>