Accessibility

17 Jan 20247 minutes to read

The MultiSelect control has been designed, keeping in mind the WAI-ARIA specifications, and applies the WAI-ARIA roles, states, and properties along with keyboard support. This control is characterized by complete keyboard interaction support and ARIA accessibility support that makes it easy for people who use assistive technologies (AT) or those who completely rely on keyboard navigation.

The MultiSelect component followed the accessibility guidelines and standards, including ADA, Section 508, WCAG 2.2 standards, and WCAG roles that are commonly used to evaluate accessibility.

The accessibility compliance for the MultiSelect component is outlined below.

Accessibility Criteria Compatibility
WCAG 2.2 Support Yes
Section 508 Support Yes
Screen Reader Support Yes
Right-To-Left Support Yes
Color Contrast Yes
Mobile Device Support Yes
Keyboard Navigation Support Yes
Accessibility Checker Validation Yes
Axe-core Accessibility Validation Yes
Yes - All features of the component meet the requirement.
Intermediate - Some features of the component do not meet the requirement.
No - The component does not meet the requirement.

WAI-ARIA attributes

The MultiSelect control uses the Listbox role, and each list item has an option role. The following ARIA attributes denote the MultiSelect state.

Properties Functionalities
aria-haspopup Indicates whether the MultiSelect input element has a popup list or not.
aria-expanded Indicates whether the popup list has expanded or not.
aria-selected Indicates the selected option.
aria-readonly Indicates the readonly state of the MultiSelect element.
aria-disabled Indicates whether the MultiSelect control is in a disabled state or not.
aria-activedescendent This attribute holds the ID of the active list item to focus its descendant child element.
aria-owns This attribute contains the ID of the popup list to indicate popup as a child element.

Keyboard interaction

You can use the following key shortcuts to access the MultiSelect without interruptions.

Keyboard shortcuts Actions
Arrow Down Set focus at the first item in the MultiSelect when no item selected. Otherwise, moves focus next to the currently selected item.
Arrow Up Moves focus previous to the currently selected one.
Page Down Scrolls down to the next page and set focus to the first item when popup list opens.
Page Up Scrolls up to the previous page and set focus to the first item when popup list opens.
Enter Selects the focused item, and popup list closes when it is in open state.
Tab Focuses on the next TabIndex element on the page when the popup is closed. Otherwise, closes the popup list and remains the focus of the control.
Shift + tab Focuses on the previous TabIndex element on the page when the popup is closed. Otherwise, closes the popup list and remains the focus of the control.
Alt + Down Opens the popup list.
Alt + Up Closes the popup list.
Esc(Escape) Closes the popup list when it is in an open state and the currently selected item remains the same.
Home set focus to the first item.
End set focus to the last item.

NOTE

In the below sample, focus the MultiSelect control using alt+t keys.

@Html.EJS().MultiSelect("games").Placeholder("Select a game").PopupHeight("200px").DataSource((IEnumerable<object>)ViewBag.data).Render()

<script>
    document.onkeyup = function (e) {
        if (e.altKey && e.keyCode === 84 /* t */) {
            var dropObj = document.getElementById("games"); //to get dropdown list object
            dropObj.ej2_instances[0].focusIn(); // call the focusIn method to focus the element.
        }
    };
</script>a
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class MultiSelectController : Controller
    {
        public ActionResult accessibility()
        {
            ViewBag.data = new string[] { "Badminton", "Basketball", "Cricket", "Football", "Golf", "Gymnastics", "Hockey", "Tennis" };
            return View();
        }
    }
}

Ensuring accessibility

The MultiSelect component’s accessibility levels are ensured through an accessibility-checker and axe-core software tools during automated testing.

The accessibility compliance of the MultiSelect component is shown in the following sample. Open the sample in a new window to evaluate the accessibility of the MultiSelect component with accessibility tools.

See also