Accessibility

28 Feb 20225 minutes to read

ARIA attributes

The web accessibility makes web content and web applications more accessible for people with disabilities. It especially helps in dynamic content change and development of advanced user interface controls with AJAX, HTML, JavaScript, and related technologies. ContextMenu provides built-in compliance with WAI-ARIA specifications. WAI-ARIA support is achieved through the attributes like aria-expanded and aria-haspopup applied for menu item in ContextMenu. It helps the people with disabilities by providing information about the widget for assistive technology in the screen readers. ContextMenu component contains the menu role and menuItem role.

Properties	Functionality
menu	This role will be specified for an item which have sub menu.
menuItem	This role will be specified for an item that do not have sub menus.
aria-haspopup	Indicates the availability and type of interactive popup element.
aria-expanded	Indicates whether the subtree can be expanded or collapsed, as well as indicates whether its current state is expanded or collapsed.

Keyboard interaction

Keyboard shortcuts	Actions
`Esc`	Closes the opened ContextMenu.
`Enter`	Selects the focused item.
`Up`	Navigates up or to the previous menu item.
`Down`	Navigates down or to the next menu item.
`Left`	Close the current sub menu and navigates to the parent menu.
`Right`	Navigates and open the next sub menu.

CSHTML
Accessibility.cs
<ejs-contextmenu id="contextmenu" items="ViewBag.menuItems"></ejs-contextmenu>

<script>

  window.onload = function () {
    ej.base.getInstance(document.getElementById("contextmenu"), ejs.navigations.ContextMenu).open(40, 20);
  }

</script>

<style>

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

.e-cm-icons {
  font-family: 'e-context-menu';
  font-style: normal;
  font-variant: normal;
  font-weight: normal;
  line-height: 1;
  text-transform: none;
}

@@font-face {
  font-family: 'ddb-icons';
  src:
  url(data:application/x-font-ttf;charset=utf-8;base64,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) format('truetype');
  font-weight: normal;
  font-style: normal;
}

.cm-icons {
  font-family: 'ddb-icons' !important;
  speak: none;
  font-size: 55px;
  font-style: normal;
  font-weight: normal;
  font-variant: normal;
  text-transform: none;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.e-cut::before {
  content: '\e700';
}

.e-copy::before {
  content: '\e70a';
}

.e-paste::before {
  content: '\e701';
}

.e-pastespecial::before {
  content: '\e260';
}

.e-pastetext::before {
  content: '\e261';
}

#target {
  border: 1px dashed;
  height: 150px;
  padding: 10px;
  position: relative;
  text-align: justify;
  color: gray;
  user-select: none;
}

</style>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace WebApplication1.Controllers
{
    public class ContextMenuController : Controller
    {
        public IActionResult Accessibility()
        {
            List<object> menuItems = new List<object>();
            menuItems.Add(new
            {
                text = "Cut",
                iconCss = "cm-icons e-cut"
            });
            menuItems.Add(new
            {
                text = "Copy",
                iconCss = "e-cm-icons e-copy"
            });
            menuItems.Add(new
            {
                text = "Paste",
                iconCss = "cm-icons e-paste",
                items = new List<object>()
                {
                    new { text = "Paste Text", iconCss = "e-cm-icons e-pastetext" },
                    new { text = "Paste Special", iconCss = "e-cm-icons e-pastespecial" }
                }
            });
            ViewBag.menuItems = menuItems;
            return View();
        }
    }
}