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Tooltip can be shown for each list box items by customizing it in beforeItemRender event.

In the following example, the tooltip can be shown by setting title attribute for each li element in beforeItemRender event.

Source
Preview
index.js
index.html
// define the array of object
var data = [
    { text: 'Hennessey Venom', id: 'list-01' },
    { text: 'Bugatti Chiron', id: 'list-02' },
    { text: 'Bugatti Veyron Super Sport', id: 'list-03' },
    { text: 'SSC Ultimate Aero', id: 'list-04' },
    { text: 'Koenigsegg CCR', id: 'list-05' },
    { text: 'McLaren F1', id: 'list-06' },
    { text: 'Aston Martin One- 77', id: 'list-07' },
    { text: 'Jaguar XJ220', id: 'list-08' },
    { text: 'McLaren P1', id: 'list-09' },
    { text: 'Ferrari LaFerrari', id: 'list-10' }
];

// initialize ListBox component
var listObj = new ej.dropdowns.ListBox({
    //set the data to dataSource property
    dataSource: data,
    beforeItemRender: function() {
        args.element.setAttribute('title', args.element.textContent);
    }
});
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/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin:0 auto; width:250px;">
        <h4>Select your favorite car:</h4>
        <input id="listbox">
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>