Customize menu using events in EJ2 JavaScript Menu control

16 Jun 20237 minutes to read
The Menu provides a set of events to enable users to customize it.
The available events are beforeOpen, beforeClose, onClose, onOpen, and select.
index.ts
index.html
import { Menu, MenuItemModel, MenuEventArgs } from '@syncfusion/ej2-navigations';
import { OpenCloseMenuEventArgs, BeforeOpenCloseMenuEventArgs } from '@syncfusion/ej2-navigations';
import { Button } from '@syncfusion/ej2-buttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

//Menu items definition
let menuItems: MenuItemModel[] = [
    {
        text: 'Events',
        items: [
            { text: 'Conferences' },
            { text: 'Music' },
            { text: 'Workshops' }
        ]
    },
    {
        text: 'Movies',
        items: [
            { text: 'Now Showing' },
            { text: 'Coming Soon' }
        ]
    },
    {
        text: 'Directory',
        items: [
            { text: 'Media Gallery' },
            { text: 'Newsletters' }
        ]
    },
    {
        text: 'Queries',
        items: [
            { text: 'Our Policy' },
            { text: 'Site Map' }
        ]
    },
    { text: 'Services' }
];

// Initialize Menu component.
let menuObj: Menu = new Menu({
    items: menuItems,
    beforeOpen: (args: BeforeOpenCloseMenuEventArgs) => {
        updateEventLog(args);
    },
    beforeClose: (args: BeforeOpenCloseMenuEventArgs) => {
        updateEventLog(args);
    },
    onClose: (args: OpenCloseMenuEventArgs) => {
        updateEventLog(args);
    },
    onOpen: (args: OpenCloseMenuEventArgs) => {
        updateEventLog(args);
    },
    select: (args: MenuEventArgs) => {
        updateEventLog(args);
    }
}, '#menu');

let clear: Button = new Button({ cssClass: 'e-small'});
clear.appendTo('#clear');

clear.element.onclick = () => {
    let propertyElem: HTMLElement = document.getElementById('propertyTable');
    propertyElem.getElementsByTagName('td')[0].innerHTML = '';
}

function updateEventLog(args: any): void {
    let propertyElem: HTMLElement = document.getElementById('propertyTable');
    propertyElem.getElementsByTagName('td')[0].insertAdjacentHTML('beforeend', args.name + ' Event triggered. <br />');
}
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <meta name="description" content="Essential JS 2">
    <meta name="author" content="Syncfusion">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet">

    <!--style reference from app-->
    <link href="styles.css" rel="stylesheet">

    <!--system js reference and configuration-->
    
    
<script src="https://cdn.syncfusion.com/ej2/23.1.36/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div class="control-section">
            <div class="menu-section">
                <ul id="menu"></ul>
            </div>
            <div class="property-section">
                <table id="propertyTable" title="Event trace">
                    <tbody>
                        <tr><th>Event trace:-</th>
                        </tr><tr>
                            <td></td>
                        </tr>
                    </tbody>
                </table>
            </div>
            <button id="clear">Clear</button>
        </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>