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Create mnemonic UI in menu item in JavaScript (ES5) Menu Bar control

27 Jul 2021 / 2 minutes to read

A particular character in a text can be underlined in the beforeItemRender event by adding <u> tag in between the text and assign the innerHTML to the li element.

In the following example, the first character in File, Open, and Save menu items are underlined.

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

//Menu datasource
var menuItems = [
    {
        text: 'File',
        iconCss: 'em-icons e-file',
        items: [
            { text: 'Open', iconCss: 'em-icons e-open' },
            { text: 'Save', iconCss: 'e-icons e-save' },
            { separator: true },
            { text: 'Exit' }
        ]
    },
    {
        text: 'Edit',
        iconCss: 'em-icons e-edit',
        items: [
            { text: 'Cut', iconCss: 'em-icons e-cut' },
            { text: 'Copy', iconCss: 'em-icons e-copy' },
            { text: 'Paste', iconCss: 'em-icons e-paste' }
        ]
    },
    { text: 'Format' },
    { text: 'View' },
    { text: 'Bookmarks' },
    { text: 'Tools' },
    { separator: true },
    { text: 'Help' }
];

// Initialize Menu component.
var menuObj = new ej.navigations.Menu({
    items: menuItems,
    beforeItemRender: function (args) {
        if (['File', 'Open', 'Save'].indexOf(args.item.text) > -1) {
            // To underline a First character.
            var underlinedText = '<u>' + args.item.text.slice(0, 1) + '</u>' + args.item.text.slice(1);
            args.element.innerHTML = args.element.innerHTML.replace(args.item.text, underlinedText);
        }
    }
}, '#menu');
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<!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="//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-navigations/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/dist/ej2.min.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <ul id="menu"></ul>
    </div>    



<script>
var ele = document.getElementById('container');
if(ele) {
    ele.style.visibility = "visible";
 }   
        </script>
<script src="index.js" type="text/javascript"></script>
</body></html>
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body {
        margin-top: 100px;
        text-align: center;
    }

    /**
    * ej2 Menu styles
    */
    @font-face {
        font-family: 'e-menu';
        src:
        url(data:application/x-font-ttf;charset=utf-8;base64,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) format('truetype');
        font-weight: normal;
        font-style: normal;
    }

    .em-icons {
        font-family: 'e-menu';
        font-style: normal;
        font-variant: normal;
        font-weight: normal;
        line-height: 1;
        text-transform: none;
    }
    
    .e-file::before {
        content: '\e886';
    }
    
    .e-edit::before {
        content: '\e822';
    }

    .e-cut::before {
        content: '\e5a9';
    }

    .e-copy::before {
        content: '\e5b3';
    }

    .e-paste::before {
        content: '\e5b2';
    }

    .e-open::before {
        content: '\e885';
    }

    .e-save::before {
        content: '\e98e';
    }