How to create a dropdown menu in Bootstrap ?

A dropdown menu offers a list of alternatives when clicked or hovered on, which is a clean method of providing a list of alternatives as only one option is displayed initially onto the screen. Drop-down menus are used in almost all types of software nowadays to show sub-options of the option. 

Step 1: To include this drop-down into your website by making use of bootstrap, you just need to include the following jQuery and bootstrap js libraries, as scripts in your HTML code.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>   <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script> 

 

Step 2: Include the following stylesheet in the head of the HTML document to give an appearance of a dropdown.

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">

Step 3: And make sure to enclose the dropdown menu within the .dropdown class, the button or the main option within .btn btn-primary dropdown-toggle class, and the list of alternatives within the .dropdown-menu class as below.

<div class="dropdown"> 
 <button class="btn btn-primary dropdown-toggle" 
 type="button" data-toggle="dropdown">
 Data Structures 
 <span class="caret"></span>
 </button> 
 <ul> 
 <li><a href="#">Array</a></li> 
 <li><a href="#">Stack</a></li> 
 <li><a href="#">Queue</a></li> 
 </ul> 
</div> 

The class .caret is used to display the little upside-down triangle in the button as shown in the output.

Example:

Output: As you can see in the output, the dropdown button is created with the name Data Structures, and on clicking it, you are provided with a list of options as you can see above. 

👁 Image