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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.

Source
Preview
index.ts
index.html
import { Tab } from '@syncfusion/ej2-navigations';
import { enableRipple } from '@syncfusion/ej2-base';
import { DataManager, Query, ODataAdaptor, ReturnOption } from '@syncfusion/ej2-data';

enableRipple(true);

let itemsData: any = [];
let mapping =  { header: 'FirstName', content: 'Notes' };
const SERVICE_URI: string = 'https://js.syncfusion.com/ejServices/Wcf/Northwind.svc/Employees';

new DataManager({ url: SERVICE_URI, adaptor: new ODataAdaptor})
  .executeQuery(new Query().range(1, 4)).then((e: ReturnOption) => {
    let result: any = e.result;

    for(let i: number = 0; i < result.length; i++) {
      itemsData.push({ header: {text: result[i][mapping.header]}, content: result[i][mapping.content] });
    }

    let tabObj: Tab = new Tab({
      items: itemsData
    });
    tabObj.appendTo('#element');
});
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 Tab</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 Tab" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div id='element'></div>
        <br/><br/>
        <div id='result'></div>
    </div>
</body>

</html>