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Load Tab items dynamically in ASP.NET Core Tabs control

19 Oct 2021 / 1 minute to read

Tabs can be added dynamically by passing array of items and index value to the addTab method.

In the following demo, you can add the tab content by clicking the +. Enter the new Tab heading and content details in the available text boxes, click ‘Add Tab’ button to pass the details as an array and here last index is calculated to append the new tab at the end.

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@using Syncfusion.EJ2.Navigations;

<div id="tab1_content" style="display: none">
        <li>Click on the "+" header to add dynamic tab items. </li>
        <li>It displays input elements to get the new tab information. </li>
        <li>Add details and click the "Add Tab" button to open the newly added tab.</li>
<div id="form-container" style="display: none">
    <div class="e-float-input">
        <input type="text" id="tab-title" required="" />
        <span class="e-float-line"></span>
        <label class="e-float-text">Enter header title</label>
    <br />
    <div class="e-float-input">
        <textarea rows="5" type="text" id="tab-content" required=""></textarea>
        <span class="e-float-line"></span>
        <label class="e-float-text">Enter content</label>
    <br />
    <div class="btn-section">
        <button id="btn-add" class="btn btn-default" onclick="btnClicked(this)">Add Tab</button>
        <br />
        <br />
        <span class="info"> * Title is mandatory to add a new Tab</span>
<ejs-tab id="ej2Tab" created="tabCreated" Selected="tabSelected">
        <e-tab-tabitem header="ViewBag.headerTextOne" content="#tab1_content"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerTextTwo" content="#form-container"></e-tab-tabitem>

    #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;
        max-width: 500px;
        margin: 0 auto;

    #form-container {
        margin: 0 auto;
        max-width: 300px;

    .btn-section {
        text-align: center;

    .add-tab-btn-section td {
        padding: 10px;

    .info {
        font-weight: bold;

    .e-add-icon::before {
        content: '\e7d5';

<script type="text/javascript">
    function tabCreated() {
        var totalItems = 0;
        var addBtn = document.querySelectorAll(".e-ileft.e-icon");
        addBtn[0].setAttribute("title", "Add Tab");

    function tabSelected(args) {
        if (args.selectedIndex === document.querySelectorAll('#ej2Tab .e-toolbar-item').length - 1) {
            document.getElementById('tab-title').value = '';
            document.getElementById('tab-content').value = '';

    function btnClicked(e) {
        var title = document.getElementById('tab-title').value;
        var content = document.getElementById('tab-content').value;
        var tabObj = document.getElementById("ej2Tab").ej2_instances[0];
        // Required tab item object formed by using textbox inputs
        var item = { header: { text: title }, content: ej.base.createElement('pre', { innerHTML: content.replace(/\n/g, '<br>\n') }).outerHTML };

        totalItems = document.querySelectorAll('#ej2Tab .e-toolbar-item').length;
        // Item object and the index argument passed into the addTab method to add a new tab
        tabObj.addTab([item], totalItems - 1);
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public ActionResult Index()
    ViewBag.headerTextOne = new TabHeader { Text = "USA" };
    ViewBag.headerTextTwo = new TabHeader { IconCss = "e-add-icon" };
    return View();