Create collapsible tabs in Vue Tab component

16 Mar 20238 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.

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>
import Vue from 'vue';
import { TabPlugin } from '@syncfusion/ej2-vue-navigations';
import { Tab, TabComponent, SelectEventArgs } from '@syncfusion/ej2-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
Vue.use(TabPlugin);
export default {
  name: 'app',
  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 (e) {
        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>