The ListBox supports scrolling and it can be achieved by restricting the height of the list box using height property.
In the following sample, height of the list box is restricted to 290px.
import { ListBox } from '@syncfusion/ej2-dropdowns';
// define the array of object
let data: { [key: string]: Object }[] = [
{ text: 'Account Settings', id: 'list-01' },
{ text: 'Address Book', id: 'list-02' },
{ text: 'Delete', id: 'list-03' },
{ text: 'Forward', id: 'list-04' },
{ text: 'Reply', id: 'list-05' },
{ text: 'Reply All', id: 'list-06' },
{ text: 'Save All Attachments', id: 'list-07' },
{ text: 'Save As', id: 'list-08' },
{ text: 'Touch/Mouse Mode', id: 'list-09' },
{ text: 'Undo', id: 'list-10' }
];
// initialize ListBox component
let listObj: ListBox = new ListBox({
//set the data to dataSource property
dataSource: data,
height: '290px'
});
listObj.appendTo('#listbox');<!DOCTYPE html>
<html lang="en">
<head>
<title>Essential JS 2 ListBox</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="description" content="Typescript UI Controls" />
<meta name="author" content="Syncfusion" />
<link href="styles.css" rel="stylesheet" />
<link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-base/styles/material.css" rel="stylesheet" />
<link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/styles/material.css" rel="stylesheet" />
<link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet" />
<link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-buttons/styles/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' style="margin:0 auto; width:250px;">
<input id='listbox' />
</div>
</body>
</html>