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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.

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

tagHelper
Underline.cs
<ejs-menu id="menu" items="ViewBag.menuItems" beforeItemRender="beforeItemRender"></ejs-menu>

<script>
    function beforeItemRender(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);
        }
    }
</script>

<style>
    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';
    }
</style>
// Underline
public ActionResult Underline()
{
    List<object> menuItems = new List<object>();
    menuItems.Add(new
    {
        text = "File",
        iconCss = "em-icons e-file",
        items = new List<object>()
                {
                    new { text = "Open", iconCss= "em-icons e-open" },
                    new { text = "Save", iconCss= "e-icons e-save" },
                    new { separator = true},
                    new { text = "Exit" }
                }
    });
    menuItems.Add(new
    {
        text = "Edit",
        iconCss = "em-icons e-edit",
        items = new List<object>()
                {
                    new { text = "Cut", iconCss= "em-icons e-cut" },
                    new { text = "Copy", iconCss= "em-icons e-copy" },
                    new { text = "Paste", iconCss= "em-icons e-paste" }
                }
    });
    menuItems.Add(new
    {
        text = "Format",
    });
    menuItems.Add(new
    {
        text = "View"
    });
    menuItems.Add(new
    {
        text = "Bookmarks"
    });
    menuItems.Add(new
    {
        text = "Tools"
    });
    menuItems.Add(new
    {
        separator = true    
    });
    menuItems.Add(new
    {
        text = "Help"
    });

    ViewBag.menuItems = menuItems;
    return View();
}