Accessibility Features Overview
NOTE
The overall accessibility level of your application depends on the DropDownDropDownButton 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 DropDownButton 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) |
DropDownButton does not support Windows High Contrast themes. |
Keyboard Navigation
A user can use the following keys to interact with the DropDownButton component:
| Key | Action |
|---|---|
| ← | Moves focus to the action button when splitButton is enabled. |
| → | Moves focus to the toggle button when splitButton is enabled. |
| Enter / Space | Identical to a click. |
| Selects a menu item when focused. | |
| ↑ / ↓ | Moves focus to the previous/following menu item. |
| ↓ | Opens the drop-down menu. |
| Esc | Closes the drop-down menu. |
| Page Up / Page Down | Moves focus to the first/last menu item on the page. |
| Home / End | Moves focus to the first/last menu item. |
Use the registerKeyHandler(key, handler) method to implement a custom handler for a key.
jQuery
JavaScript
function registerKeyHandlers () {
const dropDownButton = $("#dropDownButtonContainer").dxDropDownButton("instance");
dropDownButton.registerKeyHandler("backspace", function(e) {
// The argument "e" contains information on the event
});
dropDownButton.registerKeyHandler("space", function(e) {
// ...
});
}Angular
TypeScript
import { ..., ViewChild, AfterViewInit } from '@angular/core';
import { DxDropDownButtonModule, DxDropDownButtonComponent } from 'devextreme-angular';
// ...
export class AppComponent implements AfterViewInit {
@ViewChild(DxDropDownButtonComponent, { static: false }) dropDownButton: DxDropDownButtonComponent;
// Prior to Angular 8
// @ViewChild(DxDropDownButtonComponent) dropDownButton: DxDropDownButtonComponent;
ngAfterViewInit () {
this.dropDownButton.instance.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.dropDownButton.instance.registerKeyHandler('space', function(e) {
// ...
});
}
}
@NgModule({
imports: [
// ...
DxDropDownButtonModule
],
// ...
})Vue
<template>
<DxDropDownButton :ref="myDropDownButtonRef" />
</template>
<script>
import 'devextreme/dist/css/dx.light.css';
import DxDropDownButton from 'devextreme-vue/drop-down-button';
const myDropDownButtonRef = 'my-drop-down-button';
export default {
components: {
DxDropDownButton
},
data() {
return {
myDropDownButtonRef
}
},
computed: {
dropDownButton: function() {
return this.$refs[myDropDownButtonRef].instance;
}
},
mounted: function() {
this.dropDownButton.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.dropDownButton.registerKeyHandler('space', function(e) {
// ...
});
}
}
</script>React
App.js
import React from 'react';
import 'devextreme/dist/css/dx.light.css';
import { DropDownButton } from 'devextreme-react/drop-down-button';
class App extends React.Component {
constructor(props) {
super(props);
this.dropDownButtonRef = React.createRef();
}
render() {
return (
<DropDownButton ref={this.dropDownButtonRef} />
);
}
get dropDownButton() {
return this.dropDownButtonRef.current.instance();
}
componentDidMount() {
this.dropDownButton.registerKeyHandler('backspace', function(e) {
// The argument "e" contains information on the event
});
this.dropDownButton.registerKeyHandler('space', function(e) {
// ...
});
}
}
export default App;Screen Reader Support
The DropDownButton component supports screen readers and complies to WAI-ARIA standards.
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