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Group popup items with ListView component

Header in popup items is possible in DropdownButton by templating entire popup with ListView. Create ListView with id #listview and provide it as a target for DropDownButton.

In the following example, ListView element is given as target to DropDownButton and header can be achieved by groupBy property.

Source
Preview
app.tsx
index.html
styles.css
app.jsx
import { enableRipple } from '@syncfusion/ej2-base';
import { ListViewComponent } from '@syncfusion/ej2-react-lists';
import { DropDownButtonComponent } from '@syncfusion/ej2-react-splitbuttons';
import * as React from 'react';
import * as ReactDom from 'react-dom';

enableRipple(true);

// To render DropDownButton.
class App extends React.Component<{}, {}> {
  public data: Array<{ [key: string]: string; }> = [
    { class: 'data', text: 'Print', id: 'data1', category: 'Customize Quick Access Toolbar' },
    { class: 'data', text: 'Save As', id: 'data2', category: 'Customize Quick Access Toolbar' },
    { class: 'data', text: 'Update Folder', id: 'data3', category: 'Customize Quick Access Toolbar' },
    { class: 'data', text: 'Reply', id: 'data4', category: 'Customize Quick Access Toolbar' }
  ];

  public field: { [key: string]: string; } = { text: 'text', groupBy: 'category' };
  
  public render() {
    return (
      <div>
        <ListViewComponent id="listview" dataSource={this.data} fields={this.field} showCheckBox={true}/>
        <DropDownButtonComponent  target='#listview' iconCss='e-icons e-down' cssClass='e-caret-hide'/>
      </div>
    );
  }
}
ReactDom.render(<App />,document.getElementById('button'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React DropDownButton</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="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/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>
</head>

<body>
    <div id='button'>
        <div id='loader'>Loading...</div>
    </div>
</body>

</html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.e-down::before {
  content: '\e969';
}

#listview {
    display: block;
    max-width: 600px;
    margin: auto;
    border: 1px solid #dddddd;
    border-radius: 3px;
}
import { enableRipple } from '@syncfusion/ej2-base';
import { ListViewComponent } from '@syncfusion/ej2-react-lists';
import { DropDownButtonComponent } from '@syncfusion/ej2-react-splitbuttons';
import * as React from 'react';
import * as ReactDom from 'react-dom';
enableRipple(true);
// To render DropDownButton.
class App extends React.Component {
    constructor() {
        super(...arguments);
        this.data = [
            { class: 'data', text: 'Print', id: 'data1', category: 'Customize Quick Access Toolbar' },
            { class: 'data', text: 'Save As', id: 'data2', category: 'Customize Quick Access Toolbar' },
            { class: 'data', text: 'Update Folder', id: 'data3', category: 'Customize Quick Access Toolbar' },
            { class: 'data', text: 'Reply', id: 'data4', category: 'Customize Quick Access Toolbar' }
        ];
        this.field = { text: 'text', groupBy: 'category' };
    }
    render() {
        return (<div>
        <ListViewComponent id="listview" dataSource={this.data} fields={this.field} showCheckBox={true}/>
        <DropDownButtonComponent target='#listview' iconCss='e-icons e-down' cssClass='e-caret-hide'/>
      </div>);
    }
}
ReactDom.render(<App />, document.getElementById('button'));