Angular NumberBox - Accessibility

Accessibility Features Overview

NOTE
The overall accessibility level of your application depends on the NumberBox features that 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 NumberBox 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)
NumberBox does not support Windows High Contrast themes.
- 2.5.8 Target Size (Minimum) (Level AA 2.2 only) A spin button.

Keyboard Navigation

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

Key Action
↑ or mouse wheel up Increases the UI component value by a step.
↓ or mouse wheel down Decreases the UI component value by a step.

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

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

Screen Reader Support

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

To improve accessibility, use the inputAttr property to specify aria-label for the component. You do not need to specify aria-label if you use the label option.