How TO - Collapsibles/Accordion
Learn how to create an accordion (collapsible content).
Accordion
Accordions are useful when you want to toggle between hiding and showing large amount of content:
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Create An Accordion
Step 1) Add HTML:
Example
<button class="accordion">Section 1</button>
<div class="panel">
<p>Lorem
ipsum...</p>
</div>
<button class="accordion">Section
2</button>
<div class="panel">
<p>Lorem ipsum...</p>
</div>
<button class="accordion">Section 3</button>
<div class="panel">
<p>Lorem
ipsum...</p>
</div>
Step 2) Add CSS:
Style the accordion:
Example
/* Style the buttons that are used to open and close the accordion panel */
button.accordion {
background-color: #eee;
color: #444;
cursor: pointer;
padding: 18px;
width: 100%;
text-align: left;
border: none;
outline: none;
transition: 0.4s;
}
/* Add a background color to the button if it is clicked on (add the
.active class with JS), and when you move the mouse over it (hover) */
button.accordion.active, button.accordion:hover {
background-color: #ddd;
}
/* Style the accordion panel. Note:
hidden by default */
div.panel {
padding: 0 18px;
background-color: white;
display: none;
}
/* The "show" class is added to the
accordion panel when the user clicks on one of the buttons. This
will show the panel content */
div.panel.show {
display: block !important;
}
Step 3) Add JavaScript:
Example
/* Toggle between adding and removing the
"active" and "show" classes when the user clicks on one of the
"Section"
buttons. The "active" class is used to add a background color to the
current button when its belonging panel is open. The "show" class is used to open the
specific accordion panel */
var acc = document.getElementsByClassName("accordion");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].onclick =
function(){
this.classList.toggle("active");
this.nextElementSibling.classList.toggle("show");
}
}
Try it Yourself »
Animated Accordion
Make the following changes to the panel and show
classes, to make an animated accordion.
This will make the accordion slide down (max-height) and fade in (opacity):
Example
div.panel {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition:
0.6s ease-in-out;
opacity: 0;
}
div.panel.show {
opacity: 1;
max-height:
500px; /* Whatever you like, as long as its more than the height of the
content (on all screen sizes) */
}
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Add Icons
Add a symbol to each button to indicate whether the collapsible content is open or closed:
Example
button.accordion:after {
content: '\02795'; /* Unicode
character for "plus" sign (+) */
font-size: 13px;
color: #777;
float: right;
margin-left: 5px;
}
button.accordion.active:after {
content: "\2796"; /*
Unicode character for "minus" sign (-) */
}
Try it Yourself »
