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Display tooltip on tab header in JavaScript Tabs control

08 May 2023 / 3 minutes to read

You can display tooltip for the tab component header using beforeRender event of Essential JS 2 Tooltip component which can be viewed as hint texts on mouse hovers over tab.

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import { Tab } from '@syncfusion/ej2-navigations';
import { Tooltip, TooltipEventArgs } from '@syncfusion/ej2-popups';

let tabObj: Tab = new Tab({
    heightAdjustMode: 'Auto',
    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 US6. 9.3 billion.'
let tooltip: Tooltip = new Tooltip({
  target: '.e-toolbar-item',
  position: 'TopCenter',
  content: '',
  beforeRender: onBeforeRender
function onBeforeRender(args: TooltipEventArgs): void {
  if ( {
  this.content = `<div>` + + `</div>`;
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<!DOCTYPE html>
<html lang="en">

    <title>Essential JS 2 Toolbar</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript Toolbar Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//" rel="stylesheet" />
    <link href="" rel="stylesheet" />
    <script src=""></script>
    <script src="systemjs.config.js"></script>

    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div id="Tooltip"><div id='element'></div></div>
        <div id='result'></div>