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 */
.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) */
.active, .accordion:hover {
background-color: #ccc;
}
/* Style the accordion panel. Note:
hidden by default */
.panel {
padding: 0 18px;
background-color: white;
display: none;
overflow: hidden;
}
Step 3) Add JavaScript:
Example
var acc = document.getElementsByClassName("accordion");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].addEventListener("click",
function() {
/* Toggle between adding and removing the
"active" class,
to
highlight the button that controls the panel */
this.classList.toggle("active");
/* Toggle between hiding and showing the active panel */
var panel = this.nextElementSibling;
if (panel.style.display === "block") {
panel.style.display = "none";
}
else {
panel.style.display = "block";
}
});
}
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Animated Accordion (Slide Down)
To make an animated accordion, add max-height: 0, overflow: hidden and
a transition for the max-height property, to
the panel class.
Then, use JavaScript to slide down the content by setting a calculated
max-height, depending on the panel's height on different screen sizes:
Example
<style>
.panel {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
}
</style>
<script>
var acc =
document.getElementsByClassName("accordion");
var i;
for (i = 0; i <
acc.length; i++) {
acc[i].addEventListener("click", function() {
this.classList.toggle("active");
var panel = this.nextElementSibling;
if (panel.style.maxHeight){
panel.style.maxHeight = null;
} else {
panel.style.maxHeight =
panel.scrollHeight + "px";
}
});
}
</script>
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Add Icons
Add a symbol to each button to indicate whether the collapsible content is open or closed:
Example
.accordion:after {
content: '\02795'; /* Unicode
character for "plus" sign (+) */
font-size: 13px;
color: #777;
float: right;
margin-left: 5px;
}
.active:after {
content: "\2796"; /*
Unicode character for "minus" sign (-) */
}
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