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Create collapsible Tabs

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.
tagHelper
collapsible.cs
@using Syncfusion.EJ2

@{
    var 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.";
    var 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 websites" +
                   "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.";
    var 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.";
}

<div class="col-lg-12 control-section">
    <div class="e-sample-resize-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 />
        <ejs-tab id="ej2Tab" cssClass="e-background" created="tabCreated" Selected = "tabSelected">
            <e-tab-tabitems>
                <e-tab-tabitem header="ViewBag.headerTextOne" content="@content0"></e-tab-tabitem>
                <e-tab-tabitem header="ViewBag.headerTextTwo" content="@content1"></e-tab-tabitem>
                <e-tab-tabitem header="ViewBag.headerTextThree" content="@content2"></e-tab-tabitem>
            </e-tab-tabitems>
        </ejs-tab>
    </div>
</div>

<style>
    #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;
    }

    #ej2Tab.e-tab .e-content > .e-item.e-active.collapse {
        display: none;
    }

    #ej2Tab.e-tab .e-tab-header .e-indicator.collapse {
        display: none;
    }
</style>

<script type="text/javascript">
    var trgIndex;
    var actLine;
    var target;

    function tabCreated() {
        actLine = document.querySelector('#ej2Tab.e-tab .e-indicator');
        target = document.querySelector('#ej2Tab.e-tab .e-content .e-item.e-active');
        target.classList.add('collapse');
        actLine.classList.add('collapse');
    }

    function tabSelected(e) {
        var cnttrgs = document.querySelectorAll('#ej2Tab.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 (e) {
            updateCollapseClass();
        });
    }

    function updateCollapseClass() {
        // Custom classes are added/removed from tab content and active line element, when the same tab item again clicked
        var cntEle = document.querySelector('#ej2Tab.e-tab .e-content .e-item.e-active');
        if (cntEle.classList.contains('collapse')) {
            cntEle.classList.remove('collapse');
            actLine.classList.remove('collapse');
        }
        else {
            cntEle.classList.add('collapse');
            actLine.classList.add('collapse');
        }
    }
</script>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Syncfusion.EJ2.Navigations;

namespace WebApplication1.Controllers
{
    public partial class TabController : Controller
    {
        public IActionResult collapsible()
        {
            ViewBag.headerTextOne = new TabHeader { Text = "Twitter" };
            ViewBag.headerTextTwo = new TabHeader { Text = "Facebook" };
            ViewBag.headerTextThree = new TabHeader { Text = "WhatsApp" };
            return View();
        }
    }
}