Angular ButtonGroup - Accessibility

Accessibility Features Overview

NOTE
The overall accessibility level of your application depends on the ButtonGroup features you use.
Accessibility Requirement Support Level
Right-to-Left Support
Keyboard Navigation Support
Screen Reader Support
Contrast Color Theme
Mobile Device Support
Lighthouse Accessibility Validation
Axe Accessibility Validation
WAVE Accessibility Validation
Section 508 Support
WCAG 2.x Support
  • - All component features meet the requirement
  • - Some component features may not meet the requirement
  • - Accessibility requirement is not supported

Accessibility Standards Compliance

The ButtonGroup component meets a variety of Section 508 and WCAG 2.x compliance standards. Known exceptions:

Section 508 criteria WCAG 2.x criteria Exception description
501 (Web)(Software)
504.2 (Authoring Tool)
602.3 (Support Docs)
1.4.3 Contrast (Minimum) (Level AA)
1.4.11 Non-text Contrast (Level AA 2.1 and 2.2)
ButtonGroup does not support Windows High Contrast themes.

Keyboard Navigation

A user can use the following keys to interact with the ButtonGroup component:

Key Action
← ↑ or PageUp Moves focus to the previous button.
→ ↓ or PageDown Moves focus to the next button.
Home Moves focus to the first button.
End Moves focus to the last button.
Enter or Space Identical to a click.

Use the registerKeyHandler(key, handler) method to implement a custom handler for a key.

TypeScript
  • import { ..., ViewChild, AfterViewInit } from '@angular/core';
  • import { DxButtonGroupModule, DxButtonGroupComponent } from 'devextreme-angular';
  • // ...
  • export class AppComponent implements AfterViewInit {
  • @ViewChild(DxButtonGroupComponent, { static: false }) buttonGroup: DxButtonGroupComponent;
  • // Prior to Angular 8
  • // @ViewChild(DxButtonGroupComponent) buttonGroup: DxButtonGroupComponent;
  •  
  • ngAfterViewInit () {
  • this.buttonGroup.instance.registerKeyHandler('backspace', function(e) {
  • // The argument "e" contains information on the event
  • });
  • this.buttonGroup.instance.registerKeyHandler('space', function(e) {
  • // ...
  • });
  • }
  • }
  • @NgModule({
  • imports: [
  • // ...
  • DxButtonGroupModule
  • ],
  • // ...
  • })

Screen Reader Support

The ButtonGroup component supports screen readers and complies to WAI-ARIA standards.

Each button's aria label depends on the properties you use. If you specify the text property, its value is copied to the aria-label. If you do not specify text, but set the icon property, the icon can affect the aria label, depending on the value:

  • SVG
    The content of the title tag is copied to the aria label.

  • DevExtreme icon, font icon
    The icon name is copied to the aria label.

  • Path to the icon file
    The file name is copied to the aria label.

In other cases, use elementAttr to specify the aria-label directly.