Create collapsible tabs in Vue Tab component

11 Jun 202414 minutes to read
You can achieve collapse and expand functionality in Tab by adding/removing a custom CSS class in the click event handler for each tab.
Define a CSS class to set the style property display as none. Here ‘collapse’ class is added to the content element for hiding it.
Bind the select event for Tab to collapse the initially selected Tab item and bind custom click handler for the Tab headers.
In the event handler, add and remove ‘collapse’ class to hide and show the corresponding Tab content.
Composition API (~/src/App.vue)
Options API (~/src/App.vue)
<template>
	<div id="app">
		<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 />
		<ejs-tab id='collapsible_tab' class='e-background' ref='TabInstance' :created="tabCreated" :selected="tabSelected">
			<e-tabitems>
				<e-tabitem :header='headerText0' :content="content0"></e-tabitem>
				<e-tabitem :header='headerText1' :content="content1"></e-tabitem>
				<e-tabitem :header='headerText2' :content="content2"></e-tabitem>
			</e-tabitems>
		</ejs-tab>
	</div>
</template>
<script setup>

import { TabComponent as EjsTab, TabItemsDirective as ETabitems, TabItemDirective as ETabitem } from '@syncfusion/ej2-vue-navigations';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

const headerText0 = { 'text': 'Twitter' };
const headerText1 = { 'text': 'Facebook' };
const headerText2 = { 'text': 'WhatsApp' };

const content0 = '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.';
const content1 = '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.';
const content2 = '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.';

let trgIndex;
let actLine;

const 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-collapsible_tab_0").classList.add('collapse');
	actLine.classList.add('collapse');
};
const tabSelected = (e) => {
	// If next tab item selected custom class is removed from content and active line element
	let cnttrgs = document.querySelectorAll('#collapsible_tab.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'); }
	trgIndex = e.selectedIndex;
	// Custom click event binding for each tab item to make collapse/expand
	e.selectedItem.addEventListener('click', function () {
		updateCollapseClass(trgIndex);
	}.bind());
};
const updateCollapseClass = (index) => {
	// Custom classes are added/removed from tab content and active line element, when the same tab item again clicked
	let cntEle = document.getElementById("e-content-collapsible_tab_" + index);
	if (cntEle.classList.contains('collapse')) {
		cntEle.classList.remove('collapse');
		actLine.classList.remove('collapse');
	} else {
		cntEle.classList.add('collapse');
		actLine.classList.add('collapse');
	}
};

</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-buttons/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-popups/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-navigations/styles/material.css";

#container {
	visibility: hidden;
}

#loader {
	color: #008cff;
	height: 40px;
	left: 45%;
	position: absolute;
	top: 45%;
	width: 30%;
}

.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 {
	display: none;
}

.e-tab .e-tab-header .e-indicator.collapse {
	display: none;
}
</style>
<template>
  <div id="app">
    <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 />
    <ejs-tab id='collapsible_tab' class='e-background' ref='TabInstance' :created="tabCreated" :selected="tabSelected">
      <e-tabitems>
        <e-tabitem :header='headerText0' :content="content0"></e-tabitem>
        <e-tabitem :header='headerText1' :content="content1"></e-tabitem>
        <e-tabitem :header='headerText2' :content="content2"></e-tabitem>
      </e-tabitems>
    </ejs-tab>
  </div>
</template>
<script>

import { TabComponent, TabItemDirective, TabItemsDirective } from '@syncfusion/ej2-vue-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(true);

export default {
  name: "App",
  components: {
    "ejs-tab": TabComponent,
    "e-tabitems": TabItemsDirective,
    "e-tabitem": TabItemDirective
  },
  data: function () {
    return {
      headerText0: { 'text': 'Twitter' },
      headerText1: { 'text': 'Facebook' },
      headerText2: { 'text': 'WhatsApp' },

      content0: '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.',
      content1: '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.',
      content2: '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.',
    }

  },

  mounted: function () {
    this.trgIndex;
    this.actLine;
  },

  methods: {
    tabCreated: function () {
      // After tab created first tab content and active line are hidden by adding custom class to make it collapse state
      this.actLine = document.querySelector('.e-indicator');
      document.getElementById("e-content-collapsible_tab_0").classList.add('collapse');
      this.actLine.classList.add('collapse');
    },
    tabSelected: function (e) {
      // If next tab item selected custom class is removed from content and active line element
      let cnttrgs = document.querySelectorAll('#collapsible_tab.e-tab > .e-content > .e-item');
      for (var i = 0; i < cnttrgs.length; i++) {
        cnttrgs[i].classList.remove('collapse');
      }
      if (this.actLine !== undefined) { this.actLine.classList.remove('collapse'); }
      this.trgIndex = e.selectedIndex;
      // Custom click event binding for each tab item to make collapse/expand
      e.selectedItem.addEventListener('click', function () {
        this.updateCollapseClass(this.trgIndex);
      }.bind(this));
    },
    updateCollapseClass: function (index) {
      // Custom classes are added/removed from tab content and active line element, when the same tab item again clicked
      let cntEle = document.getElementById("e-content-collapsible_tab_" + index);
      if (cntEle.classList.contains('collapse')) {
        cntEle.classList.remove('collapse');
        this.actLine.classList.remove('collapse');
      } else {
        cntEle.classList.add('collapse');
        this.actLine.classList.add('collapse');
      }
    },
  }
}
</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-buttons/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-popups/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-navigations/styles/material.css";

#container {
  visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.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 {
  display: none;
}

.e-tab .e-tab-header .e-indicator.collapse {
  display: none;
}
</style>