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Load tab with DataSource

You can bind any data object to Tab items, by mapping it to a header and content  property.

In the below demo, Data is fetched from an OData service using DataManager. The result data is formatted as a JSON object with header and content fields, which is set to items property of Tab.

razor
data.cs
@using Syncfusion.EJ2.Navigations;

<div id="ej2Tab"></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;
        max-width: 500px;
        margin: 0 auto;
    }
</style>

<script type="text/javascript">
    ej.base.enableRipple(true);
    var itemsData = [];
    var mapping = { header: 'FirstName', content: 'Notes' };
    const SERVICE_URI = 'https://js.syncfusion.com/ejServices/Wcf/Northwind.svc/Employees';
    new ej.data.DataManager({ url: SERVICE_URI, adaptor: new ej.data.ODataAdaptor })
        .executeQuery(new ej.data.Query().range(1, 4)).then((e) => {
            var result = e.result;
            for (var i = 0; i < result.length; i++) {
                itemsData.push({ header: { text: result[i][mapping.header] }, content: result[i][mapping.content] });
            }
            //Initialize Tab component
            var tabObj = new ej.navigations.Tab({
                items: itemsData
            });
            //Render initialized Tab component
            tabObj.appendTo('#ej2Tab');
        });
</script>
public ActionResult Index()
{
    return View();
}