Accessibility Features Overview
NOTE
The overall accessibility level of your application depends on the TreeView 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 TreeView 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) |
TreeView does not support Windows High Contrast themes. |
Keyboard Navigation
A user can use the following keys to interact with the TreeView component:
Key | Action |
---|---|
Shift + Mouse Wheel | Scrolls the content left/right if the scrollDirection property is "horizontal" or "both". |
↑ / ↓ | Moves focus to the previous/next node. |
Home / End | Moves focus to the first/last node. |
→ | Expands the node. |
← | Collapses the node. |
Asterisk Sign (*) | Expands all nodes. Available only if expandAllEnabled is set to true. |
Minus Sign (-) | Collapses all nodes. Available only if expandAllEnabled is set to true. |
Enter or Space | Selects the node. |
Shift + ↑ / Shift + ↓ | Extends selection up/down by one node.1 |
Shift + Home | Extends selection up to the first node.1 |
Shift + End | Extends selection down to the last node.1 |
- If showCheckBoxesMode is set to "none", this action has no effect.
Use the registerKeyHandler(key, handler) method to implement a custom handler for a key.
TypeScript
- import { ..., ViewChild, AfterViewInit } from '@angular/core';
- import { DxTreeViewModule, DxTreeViewComponent } from 'devextreme-angular';
- // ...
- export class AppComponent implements AfterViewInit {
- @ViewChild(DxTreeViewComponent, { static: false }) treeView: DxTreeViewComponent;
- // Prior to Angular 8
- // @ViewChild(DxTreeViewComponent) treeView: DxTreeViewComponent;
- ngAfterViewInit () {
- this.treeView.instance.registerKeyHandler('backspace', function(e) {
- // The argument "e" contains information on the event
- });
- this.treeView.instance.registerKeyHandler('space', function(e) {
- // ...
- });
- }
- }
- @NgModule({
- imports: [
- // ...
- DxTreeViewModule
- ],
- // ...
- })
Screen Reader Support
The TreeView component supports screen readers and complies to WAI-ARIA standards.
Feel free to share topic-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
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If you have technical questions, please create a support ticket in the DevExpress Support Center.