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:
HTML
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
<script src=
</script>
<script src=
</script>
<style>
.container {
color: green;
}
</style>
</head>
<body>
<div class="container">
<h1>GeeksforGeeks</h1>
<h2>Dropdowns</h2>
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle"
type="button" data-toggle="dropdown">
Data Structures
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">Array</a></li>
<li><a href="#">String</a></li>
<li><a href="#">Stack</a></li>
<li><a href="#">Queue</a></li>
<li><a href="#">Map</a></li>
<li><a href="#">Tree</a></li>
</ul>
</div>
</div>
</body>
</html>
|
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.
