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Create collapsible tabs in EJ2 JavaScript Tab control
4 Jan 202510 minutes to read
You can implement collapse and expand functionality in the Tab control by adding and removing a custom CSS class in the click event handler for each tab. Here’s how to achieve this:
-
Define a CSS class to hide the content: Create a
collapse
class that sets thedisplay
property tonone
. Add this class to the content element in thecreated
event to initially hide it. -
Set up event handlers:
- Bind the
selected
event for the Tab to collapse the initially selected Tab item. - Bind a custom click handler for the Tab headers.
- Bind the
-
Implement the collapse/expand functionality: In the event handler, add and remove the
collapse
class to hide and show the corresponding Tab content.
Here’s an example of how to create collapsible tabs:
ej.base.enableRipple(true);
var actLine;
var trgIndex;
//Initialize Tab component
var tabObj = new ej.navigations.Tab({
created: tabCreated,
selected: tabSelected,
items: [
{
header: { 'text': 'Twitter' },
content: 'Twitter is an online social networking service that enables users to send and read short 140-character ' +
'messages called "tweets". Registered users can read and post tweets, but those who are unregistered can only read ' +
'them. Users access Twitter through the website interface, SMS or mobile device app Twitter Inc. is based in San ' +
'Francisco and has more than 25 offices around the world. Twitter was created in March 2006 by Jack Dorsey, ' +
'Evan Williams, Biz Stone, and Noah Glass and launched in July 2006. The service rapidly gained worldwide popularity, ' +
'with more than 100 million users posting 340 million tweets a day in 2012.The service also handled 1.6 billion ' +
'search queries per day.'
},
{
header: { 'text': 'Facebook' },
content: 'Facebook is an online social networking service headquartered in Menlo Park, California. Its website was ' +
'launched on February 4, 2004, by Mark Zuckerberg with his Harvard College roommates and fellow students Eduardo ' +
'Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes.The founders had initially limited the website\'\s ' +
'membership to Harvard students, but later expanded it to colleges in the Boston area, the Ivy League, and Stanford ' +
'University. It gradually added support for students at various other universities and later to high-school students.'
},
{
header: { 'text': 'WhatsApp' },
content: 'WhatsApp Messenger is a proprietary cross-platform instant messaging client for smartphones that operates ' +
'under a subscription business model. It uses the Internet to send text messages, images, video, user location and ' +
'audio media messages to other users using standard cellular mobile numbers. As of February 2016, WhatsApp had a user ' +
'base of up to one billion,[10] making it the most globally popular messaging application. WhatsApp Inc., based in ' +
'Mountain View, California, was acquired by Facebook Inc. on February 19, 2014, for approximately US$19.3 billion.'
}
]
});
//Render initialized Tab component
tabObj.appendTo('#element');
function tabCreated() {
// After tab created first tab content and active line are hidden by adding custom class to make it collapse state
actLine = document.querySelector('.e-indicator');
document.getElementById('e-content-element_0').classList.add('collapse');
actLine.classList.add('collapse');
}
function tabSelected(e) {
// If next tab item selected custom class is removed from content and active line element
var cnttrgs = document.querySelectorAll('#element.e-tab > .e-content > .e-item');
for (var i = 0; i < cnttrgs.length; i++) {
cnttrgs[i].classList.remove('collapse');
}
if (actLine !== undefined) {
actLine.classList.remove('collapse');
}
this.trgIndex = e.selectedIndex;
// Custom click event binding for each tab item to make collapse/expand
e.selectedItem.onclick = function (e) {
updateCollapseClass(this.trgIndex);
};
}
function updateCollapseClass(index) {
// Custom classes are added/removed from tab content and active line element, when the same tab item again clicked
var cntEle = document.getElementById('e-content-' + 'element_' + index);
if (cntEle.classList.contains('collapse')) {
cntEle.classList.remove('collapse');
actLine.classList.remove('collapse');
}
else {
cntEle.classList.add('collapse');
actLine.classList.add('collapse');
}
}
<!DOCTYPE html><html lang="en"><head>
<title>Essential JS 2 Tab</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Essential JS 2 Tab">
<meta name="author" content="Syncfusion">
<link href="https://cdn.syncfusion.com/ej2/29.1.33/material.css" rel="stylesheet">
<link href="index.css" rel="stylesheet">
<script src="https://cdn.syncfusion.com/ej2/29.1.33/dist/ej2.min.js" type="text/javascript"></script>
<style>
.e-content .e-item {
font-size: 12px;
margin: 10px;
text-align: justify;
}
.container {
min-width: 350px;
margin: 0 10px;
}
.info {
margin: 10px;
font-weight: bold;
}
.e-tab .e-content>.e-item.e-active.collapse {
/* csslint allow: adjoining-classes */
display: none;
}
.e-tab .e-tab-header .e-indicator.collapse {
/* csslint allow: adjoining-classes */
display: none;
}
</style>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
<div id="container">
<div class="info">
Collapsible Tabs
</div>
<span style="margin: 10px;">
<i>The active tab can be toggled to expand and collapse its content.</i>
</span>
<br><br>
<div id="element" class="e-background"></div>
</div>
<script>
var ele = document.getElementById('container');
if(ele) {
ele.style.visibility = "visible";
}
</script>
<script src="index.js" type="text/javascript"></script>
</body></html>