W3.CSS Accordions

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W3.CSS Accordions
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Click on the "Open Section" buttons below to see how accordions work:

Open Section 1
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Open Section 2
Link 1 Link 2 Link 3
Open Section 3
Accordion with Images:

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>
»

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:

Accordion Dropdown
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

Accordion 1 
Link 1 Link 2 Link 3
Accordion 2 
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Dropdowns

Dropdown 
Link 1 Link 2 Link 3
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:

Normal button
Lorem ipsum...

Left aligned and full-width
Lorem ipsum...

Centered and full-width
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>
»

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

Open Section 1
Some text..

Open Section 2
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", "");
}
»

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

 25%
Some text..

 50%
Some text..

 75%
Some text..

 Default (100%)
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>
»

Accordion Content
Accordion with links:

 Accordion
Link 1 Link 2 Link 3
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>
»

Accordion as a List:

 Accordion
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>
»

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>
»

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

Accordion
Link 1 Link 2 Link 3
Example
<div id="Demo1" class="w3-hide w3-animate-zoom">
»


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