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W3.CSS Accordions


Click on the "Open Section" buttons below to see how accordions work:

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Accordion with Images:

Fjords

Trolltunga, Norway


Accordion

An accordion is used to show (and hide) HTML content.

Use the w3-hide class to hide the accordion content.

Use any kind of button to open and close the content:

Example

<button onclick="myFunction('Demo1')" class="w3-button w3-block w3-left-align">
Open Section 1</button>

<div id="Demo1" class="w3-container w3-hide">
  <p>Some text..</p>
</div>

<script>
function myFunction(id) {
    var x = document.getElementById(id);
    if (x.className.indexOf("w3-show") == -1) {
        x.className += " w3-show";
    } else {
        x.className = x.className.replace(" w3-show", "");
    }
}
</script>

Try it Yourself »

Both the element that is used to open the accordion and the accordion's content can be any HTML element.


Accordion vs. Dropdown

This table shows the difference between an accordion and a dropdown:

AccordionDropdown
Content pushes the page content down Content lays over existing the page content
Content is often 100% wide Content is 160px wide (default)
Often used to open multiple sections Often used to open one section

Accordions

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Dropdowns



Accordion Buttons

You can use any HTML element to open the accordion content. We prefer a button with a w3-block class, to span the entire width of the page (100% width).

Remember that buttons in W3.CSS are centered by default. Use the w3-left-align class if you want them left-aligned instead. However, you do not have to follow our approach - an accordion will look good either way:

Lorem ipsum...

Lorem ipsum...

Centered content as well!

Example

<button onclick="myFunc('Demo1')" class="w3-button">
Normal button</button>

<div id="Demo1" class="w3-hide">
  <p>Lorem ipsum...</p>
</div>

<button onclick="myFunc('Demo2')" class="w3-button w3-block w3-left-align w3-green">
Left aligned and full-width</button>

<div id="Demo2" class="w3-hide">
  <p>Lorem ipsum...</p>
</div>

<button onclick="myFunc('Demo3')" class="w3-btn w3-block w3-red">
Centered and full-width</button>

<div id="Demo3" class="w3-hide w3-center">
  <p>Centered content as well!</p>
</div>

Try it Yourself »


Active Accordion Buttons

Use JavaScript to highlight accordions that are open (clicked on):

Some text..

Some other text..

Example

// Add the w3-red class to all opened accordions
var x = document.getElementById(id);
if (x.className.indexOf("w3-show") == -1) {
  x.className += " w3-show";
  x.previousElementSibling.className += " w3-red";
} else {
  x.className = x.className.replace("w3-show", "");
  x.previousElementSibling.className =
  x.previousElementSibling.className.replace("w3-red", "");
}

Try it Yourself »


Accordion Width

By default, the width of block is 100%. To override this, change the CSS width property of the accordion container:

Some text..

Some text..

Some text..

Some text..

Example

<div class="w3-light-grey" style="width:50%">
  <button onclick="myFunction('Demo1')" class="w3-button w3-block">
    50%
  </button>
  <div id="Demo1" class="w3-hide">
    <p>Some text..</p>
  </div>
</div>

Try it Yourself »


Accordion Content

Accordion with links:

Example

<button onclick="myFunction('Demo1')" class="w3-button w3-block w3-left-align">
Accordion</button>

<div id="Demo1" class="w3-hide">
  <a href="#" class="w3-button w3-block w3-left-align">Link 1</a>
  <a href="#" class="w3-button w3-block w3-left-align">Link 2</a>
  <a href="#" class="w3-button w3-block w3-left-align">Link 3</a>
</div>

Try it Yourself »

Accordion as a List:
  • Jill
  • Eve
  • Adam

Example

<button onclick="myFunction('Demo1')" class="w3-button w3-block w3-left-align">
Accordion</button>

<div id="Demo1" class="w3-hide">
  <ul class="w3-ul">
    <li>Jill</li>
    <li>Eve</li>
    <li>Adam</li>
  </ul>
</div>

Try it Yourself »

Accordion inside a Sidebar (You will learn more about sidebars later):

Example

<div class="w3-sidebar w3-bar-block w3-light-grey w3-card-2" style="width:200px;">
  <a href="#" class="w3-bar-item w3-button">Link 1</a>
  <a href="#" class="w3-bar-item w3-button" onclick="myAccFunc()">Accordion</a>
  <div id="demoAcc" class="w3-hide">
    <a href="#" class="w3-bar-item w3-button">Link</a>
    <a href="#" class="w3-bar-item w3-button">Link</a>
  </div>
  <div class="w3-dropdown-click">
    <a href="#" class="w3-bar-item w3-button" onclick="myDropFunc()">Dropdown</a>
    <div id="demoDrop" class="w3-dropdown-content">
      <a href="#" class="w3-bar-item w3-button">Link</a>
      <a href="#" class="w3-bar-item w3-button">Link</a>
    </div>
  </div>
  <a href="#" class="w3-bar-item w3-button">Link 2</a>
  <a href="#" class="w3-bar-item w3-button">Link 3</a>
</div>

Try it Yourself »


Animated Accordions

Use any of the w3-animate-classes to fade, zoom or slide in the accordion content:

Example

<div id="Demo1" class="w3-hide w3-animate-zoom">

Try it Yourself »