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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
index.js
index.html
styles.css
ej.base.enableRipple(true);

var ddbOption = { 
  target: '#listview',
  iconCss: 'e-icons e-down',
  cssClass: 'e-caret-hide'
};

var drpDownBtn = new ej.splitbuttons.DropDownButton(ddbOption);

drpDownBtn.appendTo('#element');

var dataSource = [
    { 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' },
    { class: 'data', text: 'Reply All', id: 'data4', category: 'Customize Quick Access Toolbar' },
    { class: 'data', text: 'Forward', id: 'data4', category: 'Customize Quick Access Toolbar' },
    { class: 'data', text: 'Delete', id: 'data4', category: 'Customize Quick Access Toolbar' },
    { class: 'data', text: 'Undo', id: 'data4', category: 'Customize Quick Access Toolbar' },
];

//Initialize ListView component
var listviewInstance = new ej.lists.ListView({
    dataSource: dataSource,
    //map the appropriate columns to fields property
    fields: { text: 'text', groupBy: 'category' },
    showCheckBox: true
});

//Render initialized ListView
listviewInstance.appendTo("#listview");
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 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-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/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-splitbuttons/styles/material.css" rel="stylesheet">
    <link href="styles.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
</head>

<body>
    
    <div id="container">
        <button id="element"></button>
        <div id="listview"></div>
    </div>


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