JS Dropdown (dropdown.js)
A dropdown menu is a toggleable menu that allows the user to choose one value from a predefined list.
For a tutorial about Dropdowns, read our Bootstrap Dropdowns Tutorial.
The Dropdown Plugin Classes
| Class | Description | Example |
|---|---|---|
| .dropdown | Indicates a dropdown menu | Try it |
| .dropdown-menu | Builds the dropdown menu | Try it |
| .dropdown-menu-right | Right-aligns a dropdown menu | Try it |
| .dropdown-header | Adds a header inside the dropdown menu | Try it |
| .dropup | Indicates a dropup menu | Try it |
| .disabled | Disables an item in the dropdown menu | Try it |
| .divider | Separates items inside the dropdown menu with a horizontal line | Try it |
Via data-* Attributes
Add data-toggle="dropdown" to a link or a button to toggle a dropdown menu.
Example
<a href="#" class="dropdown-toggle"
data-toggle="dropdown">Dropdown Example</a>
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Via JavaScript
Enable manually with:
Note: The data-toggle="dropdown" attribute is required regardless of whether you call the dropdown() method.
Dropdown Options
| None |
Dropdown Methods
The following table lists all available dropdown methods.
| Method | Description | Try it |
|---|---|---|
| .dropdown("toggle") | Toggles the dropdown | Try it |
Dropdown Events
The following table lists all available dropdown events.
| Event | Description | Try it |
|---|---|---|
| show.bs.dropdown | Occurs when the dropdown is about to be shown. | Try it |
| shown.bs.dropdown | Occurs when the dropdown is fully shown (after CSS transitions have completed) | Try it |
| hide.bs.dropdown | Occurs when the dropdown is about to be hidden | Try it |
| hidden.bs.dropdown | Occurs when the dropdown is fully hidden (after CSS transitions have completed) | Try it |
Tip: Use jQuery's event.relatedTarget to get the element which triggered the dropdown:
Example
$(".dropdown").on("show.bs.dropdown", function(event){
var x = $(event.relatedTarget).text(); // Get the text of the element
alert(x);
});
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Examples
Change the caret icon to upside down
The following example changes the caret icon from pointing downwards to upwards when clicking on the dropdown:
Example
/* CSS: */
<style>
.caret.caret-up {
border-top-width: 0;
border-bottom: 4px solid #fff;
}
</style>
/* JS: */
<script>
$(document).ready(function(){
$(".dropdown").on("hide.bs.dropdown", function(){
$(".btn").html('Dropdown
<span class="caret"></span>');
});
$(".dropdown").on("show.bs.dropdown",
function(){
$(".btn").html('Dropdown <span
class="caret caret-up"></span>');
});
});
</script>
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Navbar With Dropdown
The following example adds a dropdown menu for a button in the navigation bar:
Example
<nav class="navbar navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="#">WebSiteName</a>
</div>
<div>
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li
class="dropdown">
<a
class="dropdown-toggle" data-toggle="dropdown" href="#">Page
1
<span class="caret"></span></a>
<ul
class="dropdown-menu">
<li><a href="#">Page
1-1</a></li>
<li><a href="#">Page
1-2</a></li>
<li><a href="#">Page
1-3</a></li>
</ul>
</li>
<li><a href="#">Page 2</a></li>
<li><a href="#">Page 3</a></li>
</ul>
</div>
</div>
</nav>
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The following example adds a dropdown menu with a login form in the navbar:
Example
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a class="dropdown-toggle" data-toggle="dropdown" href="#">Login <span
class="glyphicon glyphicon-log-in"></span></a>
<div
class="dropdown-menu">
<form
id="formlogin" class="form container-fluid">
<div class="form-group">
<label for="usr">Name:</label>
<input type="text" class="form-control" id="usr">
</div>
<div
class="form-group">
<label for="pwd">Password:</label>
<input type="password" class="form-control" id="pwd">
</div>
<button
type="button" id="btnLogin" class="btn btn-block">Login</button>
</form>
<div class="container-fluid">
<a class="small" href="#">Forgot password?</a>
</div>
</div>
</li>
</ul>
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Multi-Level Dropdowns
In this example, we use jQuery to open multi-level dropdowns on click:
Example
<script>
$(document).ready(function(){
$('.dropdown-submenu a.test').on("click",
function(e){
$(this).next('ul').toggle();
e.stopPropagation();
e.preventDefault();
});
});
</script>
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In this example, we have created a custom .dropdown-submenu class for multi-level dropdowns:
Example
/* CSS: */
<style>
.dropdown-submenu {
position: relative;
}
.dropdown-submenu .dropdown-menu {
top: 0;
left: 100%;
margin-top:
-1px;
}
</style>
/* JS: */
<script>
$(document).ready(function(){
$('.dropdown-submenu a.test').on("click",
function(e){
$(this).next('ul').toggle();
e.stopPropagation();
e.preventDefault();
});
});
</script>
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