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Show the list items with icons in React ComboBox component

You can render icons to the list items by mapping the the iconCss  fields. 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.tsx
index.html
import { ComboBoxComponent } from '@syncfusion/ej2-react-dropdowns';
import * as React from 'react';
import * as ReactDOM from 'react-dom';

export default class App extends React.Component<{}, {}> {
    // define the array of data
    private sortFormatData: { [key: string]: Object }[] = [
        { 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' }
    ];

    // map the icon column to iconCSS field.
    private fields: object = { text: 'Type', iconCss: 'Class', value: 'Id' };

    public render() {
        return (
             // specifies the tag for render the ComboBox component
            <ComboBoxComponent id="comboelement" dataSource={this.sortFormatData} fields={this.fields} placeholder="Select a format" />
        );
    }
}
ReactDOM.render(<App />, document.getElementById('sample'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ComboBox</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Essential JS 2 for React Components" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-react-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="./styles.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    <style>
        #loader {
            color: #008cff;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }
    </style>
</head>

<body>
    <div id='sample' style="margin: 40px auto 0; width:250px;">
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>