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 complies to all Section 508 and WCAG 2.x standards criteria.
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.
jQuery
JavaScript
function registerKeyHandlers () {
const numberBox = $("#numberBoxContainer").dxNumberBox("instance");
numberBox.registerKeyHandler("backspace", function(e) {
// The argument "e" contains information on the event
});
numberBox.registerKeyHandler("space", function(e) {
// ...
});
}Angular
TypeScript
import { ..., ViewChild, AfterViewInit } from '@angular/core';
import { DxNumberBoxModule, DxNumberBoxComponent } from 'devextreme-angular';
// ...
export class AppComponent implements AfterViewInit {
@ViewChild(DxNumberBoxComponent, { static: false }) numberBox: DxNumberBoxComponent;
// Prior to Angular 8
// @ViewChild(DxNumberBoxComponent) numberBox: DxNumberBoxComponent;
ngAfterViewInit () {
this.numberBox.instance.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.numberBox.instance.registerKeyHandler('space', function(e) {
// ...
});
}
}
@NgModule({
imports: [
// ...
DxNumberBoxModule
],
// ...
})Vue
<template>
<DxNumberBox :ref="myNumberBoxRef" />
</template>
<script>
import 'devextreme/dist/css/dx.light.css';
import DxNumberBox from 'devextreme-vue/number-box';
const myNumberBoxRef = 'my-number-box';
export default {
components: {
DxNumberBox
},
data() {
return {
myNumberBoxRef
}
},
computed: {
numberBox: function() {
return this.$refs[myNumberBoxRef].instance;
}
},
mounted: function() {
this.numberBox.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.numberBox.registerKeyHandler('space', function(e) {
// ...
});
}
}
</script>React
App.js
import React from 'react';
import 'devextreme/dist/css/dx.light.css';
import { NumberBox } from 'devextreme-react/number-box';
class App extends React.Component {
constructor(props) {
super(props);
this.numberBoxRef = React.createRef();
}
render() {
return (
<NumberBox ref={this.numberBoxRef} />
);
}
get numberBox() {
return this.numberBoxRef.current.instance;
}
componentDidMount() {
this.numberBox.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.numberBox.registerKeyHandler('space', function(e) {
// ...
});
}
}
export default App;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.
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