Dropdown button in css

Dropdowns

Toggle contextual overlays for displaying lists of links and more with the Bootstrap dropdown plugin.

Overview

Dropdowns are toggleable, contextual overlays for displaying lists of links and more. They’re made interactive with the included Bootstrap dropdown JavaScript plugin. They’re toggled by clicking, not by hovering; this is an intentional design decision.

Dropdowns are built on a third party library, Popper.js, which provides dynamic positioning and viewport detection. Be sure to include popper.min.js before Bootstrap’s JavaScript or use bootstrap.bundle.min.js / bootstrap.bundle.js which contains Popper.js. Popper.js isn’t used to position dropdowns in navbars though as dynamic positioning isn’t required.

If you’re building our JavaScript from source, it requires util.js .

Accessibility

The WAI ARIA standard defines an actual role=»menu» widget, but this is specific to application-like menus which trigger actions or functions. ARIA menus can only contain menu items, checkbox menu items, radio button menu items, radio button groups, and sub-menus.

Bootstrap’s dropdowns, on the other hand, are designed to be generic and applicable to a variety of situations and markup structures. For instance, it is possible to create dropdowns that contain additional inputs and form controls, such as search fields or login forms. For this reason, Bootstrap does not expect (nor automatically add) any of the role and aria- attributes required for true ARIA menus. Authors will have to include these more specific attributes themselves.

However, Bootstrap does add built-in support for most standard keyboard menu interactions, such as the ability to move through individual .dropdown-item elements using the cursor keys and close the menu with the ESC key.

Examples

Wrap the dropdown’s toggle (your button or link) and the dropdown menu within .dropdown , or another element that declares position: relative; . Dropdowns can be triggered from or elements to better fit your potential needs.

Single button dropdowns

Any single .btn can be turned into a dropdown toggle with some markup changes. Here’s how you can put them to work with either elements:

 class="dropdown">  class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropdown button  class="dropdown-menu" aria-labelledby="dropdownMenuButton">  class="dropdown-item" href="#">Action  class="dropdown-item" href="#">Another action  class="dropdown-item" href="#">Something else here  

 class="dropdown show">  class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropdown link  class="dropdown-menu" aria-labelledby="dropdownMenuLink">  class="dropdown-item" href="#">Action  class="dropdown-item" href="#">Another action  class="dropdown-item" href="#">Something else here  

The best part is you can do this with any button variant, too:

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CSS Dropdowns

Create a dropdown box that appears when the user moves the mouse over an element.

Example

.dropdown-content display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
padding: 12px 16px;
z-index: 1;
>

.dropdown:hover .dropdown-content display: block;
>

Example Explained

HTML) Use any element to open the dropdown content, e.g. a , or a element.

Use a container element (like ) to create the dropdown content and add whatever you want inside of it.

Wrap a element around the elements to position the dropdown content correctly with CSS.

CSS) The .dropdown class uses position:relative , which is needed when we want the dropdown content to be placed right below the dropdown button (using position:absolute ).

The .dropdown-content class holds the actual dropdown content. It is hidden by default, and will be displayed on hover (see below). Note the min-width is set to 160px. Feel free to change this. Tip: If you want the width of the dropdown content to be as wide as the dropdown button, set the width to 100% (and overflow:auto to enable scroll on small screens).

Instead of using a border, we have used the CSS box-shadow property to make the dropdown menu look like a «card».

The :hover selector is used to show the dropdown menu when the user moves the mouse over the dropdown button.

Dropdown Menu

Create a dropdown menu that allows the user to choose an option from a list:

This example is similar to the previous one, except that we add links inside the dropdown box and style them to fit a styled dropdown button:

Example

/* The container — needed to position the dropdown content */
.dropdown position: relative;
display: inline-block;
>

/* Dropdown Content (Hidden by Default) */
.dropdown-content display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
>

/* Links inside the dropdown */
.dropdown-content a color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
>

/* Change color of dropdown links on hover */
.dropdown-content a:hover

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content display: block;
>

/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn background-color: #3e8e41;
>

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How TO — Hoverable Dropdown

Learn how to create a hoverable dropdown menu with CSS.

Dropdown

A dropdown menu is a toggleable menu that allows the user to choose one value from a predefined list:

Create A Hoverable Dropdown

Create a dropdown menu that appears when the user moves the mouse over an element.

Step 1) Add HTML:

Example

Example Explained

Use any element to open the dropdown menu, e.g. a , or

element.

Use a container element (like ) to create the dropdown menu and add the dropdown links inside it.

Wrap a element around the button and the to position the dropdown menu correctly with CSS.

Step 2) Add CSS:

Example

/* Dropdown Button */
.dropbtn background-color: #04AA6D;
color: white;
padding: 16px;
font-size: 16px;
border: none;
>

/* The container — needed to position the dropdown content */
.dropdown position: relative;
display: inline-block;
>

/* Dropdown Content (Hidden by Default) */
.dropdown-content display: none;
position: absolute;
background-color: #f1f1f1;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
>

/* Links inside the dropdown */
.dropdown-content a color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
>

/* Change color of dropdown links on hover */
.dropdown-content a:hover

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content

/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn

Example Explained

We have styled the dropdown button with a background-color, padding, etc.

The .dropdown class uses position:relative , which is needed when we want the dropdown content to be placed right below the dropdown button (using position:absolute ).

The .dropdown-content class holds the actual dropdown menu. It is hidden by default, and will be displayed on hover (see below). Note the min-width is set to 160px. Feel free to change this. Tip: If you want the width of the dropdown content to be as wide as the dropdown button, set the width to 100% (and overflow:auto to enable scroll on small screens).

Instead of using a border, we have used the box-shadow property to make the dropdown menu look like a «card». We also use z-index to place the dropdown in front of other elements.

The :hover selector is used to show the dropdown menu when the user moves the mouse over the dropdown button.

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How TO — Clickable Dropdown

Learn how to create a clickable dropdown menu with CSS and JavaScript.

Dropdown

A dropdown menu is a toggleable menu that allows the user to choose one value from a predefined list:

Create a Clickable Dropdown

Create a dropdown menu that appears when the user clicks on a button.

Step 1) Add HTML:

Example

Example Explained

Use any element to open the dropdown menu, e.g. a , or

element.

Use a container element (like ) to create the dropdown menu and add the dropdown links inside it.

Wrap a element around the button and the to position the dropdown menu correctly with CSS.

Step 2) Add CSS:

Example

/* Dropdown Button */
.dropbtn background-color: #3498DB;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
>

/* The container — needed to position the dropdown content */
.dropdown position: relative;
display: inline-block;
>

/* Dropdown Content (Hidden by Default) */
.dropdown-content display: none;
position: absolute;
background-color: #f1f1f1;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
>

/* Links inside the dropdown */
.dropdown-content a color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
>

/* Change color of dropdown links on hover */
.dropdown-content a:hover

/* Show the dropdown menu (use JS to add this class to the .dropdown-content container when the user clicks on the dropdown button) */
.show

Example Explained

We have styled the dropdown button with a background-color, padding, hover effect, etc.

The .dropdown class uses position:relative , which is needed when we want the dropdown content to be placed right below the dropdown button (using position:absolute ).

The .dropdown-content class holds the actual dropdown menu. It is hidden by default, and will be displayed on hover (see below). Note the min-width is set to 160px. Feel free to change this. Tip: If you want the width of the dropdown content to be as wide as the dropdown button, set the width to 100% (and overflow:auto to enable scroll on small screens).

Instead of using a border, we have used the box-shadow property to make the dropdown menu look like a «card». We also use z-index to place the dropdown in front of other elements.

Step 3) Add JavaScript:

Example

/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() document.getElementById(«myDropdown»).classList.toggle(«show»);
>

// Close the dropdown menu if the user clicks outside of it
window.onclick = function(event) if (!event.target.matches(‘.dropbtn’)) var dropdowns = document.getElementsByClassName(«dropdown-content»);
var i;
for (i = 0; i < dropdowns.length; i++) var openDropdown = dropdowns[i];
if (openDropdown.classList.contains(‘show’)) openDropdown.classList.remove(‘show’);
>
>
>
>

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