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Create mnemonic UI in menu item

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
Preview
index.tsx
index.html
index.jsx
import { enableRipple } from '@syncfusion/ej2-base';
import { MenuComponent, MenuEventArgs, MenuItemModel } from '@syncfusion/ej2-react-navigations';
import * as React from 'react';
import * as ReactDom from 'react-dom';
enableRipple(true);

class App extends React.Component<{}, {}> {
    public menuObj: MenuComponent;

    public menuItems: MenuItemModel[] = [
        {
            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: 'File'
        },
        {
            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: 'Edit'
        },
        { text: 'Format' },
        { text: 'View' },
        { text: 'Bookmarks' },
        { text: 'Tools' },
        { separator: true },
        { text: 'Help' }
    ];
    constructor(props: any) {
        super(props);
        this.beforeItemRender = this.beforeItemRender.bind(this);
    }
    public beforeItemRender(args: MenuEventArgs): void {
        if (['File', 'Open', 'Save'].indexOf(args.item.text) > -1) {
            // To underline a First character.
            const 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);
        }
    }

    public render() {
        return (
            <MenuComponent items={this.menuItems} beforeItemRender={this.beforeItemRender}/>
        );
    }
}

ReactDom.render(<App />,document.getElementById('element'));
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Syncfusion React ContextMenu</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-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="index.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='element'>
        <div id='loader'>Loading....</div>
    </div>
</body>

</html>
import { enableRipple } from '@syncfusion/ej2-base';
import { MenuComponent } from '@syncfusion/ej2-react-navigations';
import * as React from 'react';
import * as ReactDom from 'react-dom';
enableRipple(true);
class App extends React.Component {
    constructor(props) {
        super(props);
        this.menuItems = [
            {
                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: 'File'
            },
            {
                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: 'Edit'
            },
            { text: 'Format' },
            { text: 'View' },
            { text: 'Bookmarks' },
            { text: 'Tools' },
            { separator: true },
            { text: 'Help' }
        ];
        this.beforeItemRender = this.beforeItemRender.bind(this);
    }
    beforeItemRender(args) {
        if (['File', 'Open', 'Save'].indexOf(args.item.text) > -1) {
            // To underline a First character.
            const 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);
        }
    }
    render() {
        return (<MenuComponent items={this.menuItems} beforeItemRender={this.beforeItemRender}/>);
    }
}
ReactDom.render(<App />, document.getElementById('element'));