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:
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.
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.
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.
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;
}
Step 3) Add JavaScript:
Example
var acc = document.getElementsByClassName("accordion");
var i;
for (i = 0; i < acc.length; i++) {
acc[i].onclick =
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";
}
}
}
Try it Yourself »
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>
div.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].onclick = 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>
Try it Yourself »
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 »
