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Show the list items with icons

You can render icons to the list items by mapping the iconCss  field. This iconCss field create a span in the list item with mapped class name to allow styling as per your need.

In the following sample, icon classes are mapped with iconCss field.

Source
Preview
index.js
index.html
let sortFormatData = [
    { Class: 'asc-sort', Type: 'Sort A to Z', Id: '1' },
    { Class: 'dsc-sort', Type: 'Sort Z to A ', Id: '2' },
    { Class: 'filter', Type: 'Filter', Id: '3' },
    { Class: 'clear', Type: 'Clear', Id: '4' }
];
//initiates the component
let sortFormat = new ej.dropdowns.DropDownList({
    //set the data to dataSource property
    dataSource: sortFormatData,
    // map the icon column to iconCSS field.
    fields: { value: 'Type', iconCss: 'Class' },
    // set placeholder to DropDownList input element
    placeholder: 'Find a format'
});
sortFormat.appendTo('#comboelement');
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 DropDownList</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">
    
    
<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;">
        <br>
        <input type="text" id="ddlelement">
    </div>


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