How TO - Collapse
Learn how to create a collapsible section.
Collapsible
Click the button to toggle between showing and hiding the collapsible content.
Some collapsible content. Click the button to toggle between showing and hiding the collapsible 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.
Create A Collapsible
Step 1) Add HTML:
Example
<button class="collapsible">Open Collapsible</button>
<div class="content">
<p>Lorem ipsum...</p>
</div>
Step 2) Add CSS:
Style the accordion:
Example
/* Style the button that is used to open and close the
collapsible content */
.collapsible {
background-color: #eee;
color: #444;
cursor: pointer;
padding: 18px;
width: 100%;
border: none;
text-align: left;
outline: none;
font-size: 15px;
}
/* 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, .collapsible:hover {
background-color: #ccc;
}
/* Style the
collapsible content. Note:
hidden by default */
.content {
padding: 0 18px;
display:
none;
overflow: hidden;
background-color: #f1f1f1;
}
Step 3) Add JavaScript:
Example
var coll = document.getElementsByClassName("collapsible");
var i;
for (i = 0; i < coll.length; i++) {
coll[i].addEventListener("click",
function() {
this.classList.toggle("active");
var content = this.nextElementSibling;
if (content.style.display
=== "block") {
content.style.display =
"none";
} else {
content.style.display = "block";
}
});
}
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Animated Collapsible (Slide Down)
To make an animated collapsible, 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>
.content {
padding: 0 18px;
background-color: white;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
}
</style>
<script>
var
coll =
document.getElementsByClassName("collapsible");
var i;
for (i = 0; i <
coll.length; i++) {
coll[i].addEventListener("click", function() {
this.classList.toggle("active");
var content = this.nextElementSibling;
if (content.style.maxHeight){
content.style.maxHeight = null;
} else {
content.style.maxHeight =
content.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
.collapsible:after {
content: '\02795'; /* Unicode
character for "plus" sign (+) */
font-size: 13px;
color: white;
float: right;
margin-left: 5px;
}
.active:after {
content: "\2796"; /*
Unicode character for "minus" sign (-) */
}
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