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>
Action
Another action
Something else here
Separated link
Action
Another action
Something else here
Separated link
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>
Action
Another action
Something else here
Separated link
Action
Another action
Something else here
Separated link
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>
Action
Another action
Something else here
Separated link
Action
Another action
Something else here
Separated link
Action
Another action
Something else here
Separated link
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>
Action
Another action
Something else here
Separated link
Action
Another action
Something else here
Separated link

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