Accessibility Features Overview
NOTE
The overall accessibility level of your application depends on the DropDownBox 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 DropDownBox component complies to all Section 508 and WCAG 2.x standards criteria except the following:
| Section 508 criteria | WCAG 2.x criteria | Exception description |
|---|---|---|
| - | 1.4.3 Contrast (Minimum) (Level AA) | The placeholder text color does not meet contrast criteria. |
| 11.5.2.5 Object information | 3.3.1 Error Identification (Level A) 3.3.3 Error Suggestion (Level AA) 4.1.2 Name, Role, Value (Level A) |
The validation state and error message of DropDownBox are not pronounced when the control’s validation state changes or users change the text input. |
Keyboard Navigation
A user can use the following keys to interact with the DropDownBox component:
| Key | Action |
|---|---|
| Alt + ↓ | Opens the drop-down field. |
Use the registerKeyHandler(key, handler) method to implement a custom handler for a key.
jQuery
JavaScript
function registerKeyHandlers () {
const dropDownBox = $("#dropDownBoxContainer").dxDropDownBox("instance");
dropDownBox.registerKeyHandler("backspace", function(e) {
// The argument "e" contains information on the event
});
dropDownBox.registerKeyHandler("escape", function(e) {
dropDownBox.option('opened', false);
});
}Angular
TypeScript
import { ..., ViewChild, AfterViewInit } from '@angular/core';
import { DxDropDownBoxModule, DxDropDownBoxComponent } from 'devextreme-angular';
// ...
export class AppComponent implements AfterViewInit {
@ViewChild(DxDropDownBoxComponent, { static: false }) dropDownBox: DxDropDownBoxComponent;
ngAfterViewInit () {
this.dropDownBox.instance.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.dropDownBox.instance.registerKeyHandler('escape', function(e) {
this.dropDownBox.instance.option('opened', false);
});
}
}
@NgModule({
imports: [
// ...
DxDropDownBoxModule
],
// ...
})Vue
<template>
<DxDropDownBox :ref="myDropDownBoxRef" />
</template>
<script>
import 'devextreme/dist/css/dx.light.css';
import DxDropDownBox from 'devextreme-vue/drop-down-box';
const myDropDownBoxRef = 'my-drop-down-box';
export default {
components: {
DxDropDownBox
},
data() {
return {
myDropDownBoxRef
}
},
computed: {
dropDownBox: function() {
return this.$refs[myDropDownBoxRef].instance;
}
},
mounted: function() {
this.dropDownBox.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.dropDownBox.registerKeyHandler('escape', function(e) {
this.dropDownBox.option('opened', false);
});
}
}
</script>React
App.js
import React from 'react';
import 'devextreme/dist/css/dx.light.css';
import { DropDownBox } from 'devextreme-react/drop-down-box';
class App extends React.Component {
constructor(props) {
super(props);
this.dropDownBoxRef = React.createRef();
}
render() {
return (
<DropDownBox ref={this.dropDownBoxRef} />
);
}
get dropDownBox() {
return this.dropDownBoxRef.current.instance;
}
componentDidMount() {
this.dropDownBox.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.dropDownBox.registerKeyHandler('escape', function(e) {
this.dropDownBox.option('opened', false);
});
}
}
export default App;Screen Reader Support
The DropDownBox component supports screen readers and complies to WAI-ARIA standards. The exceptions are listed in the Accessibility Standards Compliance topic.
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 label.
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