Bootstrap Dropdowns

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Dropdown menu is a graphical control element like a list box that allows the user to choose one value from a predefined list. It is a toggleable menu.

Bootstrap provides the following classes to create a dropdown.
.dropdown: class is used to create a dropdown menu.
.dropdown-toggle: class is used to make dropdown toggleable.
.caret: class is used to create a caret arrow icon.
.dropdown-menu: class is used with ul element to actually build the dropdown menu.

Bootstrap Dropdowns Example:

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
  <h2>Bootstrap Dropdowns Example</h2>
  <div class="dropdown">
    <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
    <span class="caret"></span></button>
    <ul class="dropdown-menu">
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
    </ul>
  </div>
</div>
 
</body>
</html>

Output:

Bootstrap Dropdowns Divider

The .divider class is used to separate links inside the dropdown menu with a thin horizontal border.

Bootstrap Dropdowns Divider Example:

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
  <h2>Bootstrap Dropdowns Divider Example</h2>
  <div class="dropdown">
    <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">Tutorials
    <span class="caret"></span></button>
    <ul class="dropdown-menu">
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
      <li class="divider"></li>
      <li><a href="#">Contact Us</a></li>
    </ul>
  </div>
</div>
 
</body>
</html>

Output:

Bootstrap Dropdowns Header

The .dropdown-header class is used to add headers inside the dropdown menu.

Bootstrap Dropdowns Header Example:

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
  <h2>Bootstrap Dropdown Header Example</h2>
  <div class="dropdown">
    <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">Tutorials
    <span class="caret"></span></button>
    <ul class="dropdown-menu">
      <li class="dropdown-header">Tutorial Header</li>
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
      <li class="divider"></li>
      <li class="dropdown-header">Contact Header</li>
      <li><a href="#">Contact Us</a></li>
    </ul>
  </div>
</div>
 
</body>
</html>

Output:

Bootstrap Dropdowns Disable and Active items

Bootstrap provides the following classes to disable and active dropdown items.
.active: class is used to highlight a specific dropdown item.
.disabled: class is used to disable a specific dropdown item.

Bootstrap Dropdowns Disable and Active items Example:

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Dropdowns Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
  <h2>Bootstrap Dropdowns Example</h2>
  <div class="dropdown">
    <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">Tutorials
    <span class="caret"></span></button>
    <ul class="dropdown-menu">
      <li><a href="#">HTML</a></li>
      <li class="disabled"><a href="#">CSS</a></li>
      <li class="active"><a href="#">JavaScript</a></li>
    </ul>
  </div>
</div>
 
</body>
</html>

Output:

Bootstrap Dropdowns Position

Bootstrap Dropdown position is in left by-default. To right-align the dropdown we can use .dropdown-menu-right class to the element with .dropdown-menu.

Bootstrap Dropdowns Position Example:

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
  <h2>Bootstrap Dropdowns Example</h2>
  <div class="dropdown">
    <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Position Example
    <span class="caret"></span></button>
    <ul class="dropdown-menu dropdown-menu-right">
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
      <li class="divider"></li>
      <li><a href="#">Contact Us</a></li>
    </ul>
  </div>
</div>
 
</body>
</html>

Output:

Bootstrap Dropup

The .dropup class is used to expand dropdown menu upwards instead of downwards.

Bootstrap Dropup Example:

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
 
<div class="container">
  <h2>Bootstrap Dropdowns Example</h2>
  <div class="dropup">
    <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">Dropup Example
    <span class="caret"></span></button>
    <ul class="dropdown-menu">
      <li><a href="#">HTML</a></li>
      <li><a href="#">CSS</a></li>
      <li><a href="#">JavaScript</a></li>
      <li class="divider"></li>
      <li><a href="#">Contact Us</a></li>
    </ul>
  </div>
</div>
 
</body>
</html>

Output: