TreeList Accessibility
The TreeList is accessible by screen readers and provides WAI-ARIA, Section 508, WCAG 2.2, and keyboard support.
For more information, refer to:
Out of the box, the Kendo UI for jQuery TreeList provides extensive accessibility support and enables users with disabilities to acquire complete control over its features.
The TreeList is compliant with the Web Content Accessibility Guidelines (WCAG) 2.2 AA standards and Section 508 requirements, follows the Web Accessibility Initiative - Accessible Rich Internet Applications (WAI-ARIA) best practices for implementing the keyboard navigation for its component role, provides options for managing its focus and is tested against the most popular screen readers.
WAI-ARIA
This section lists the selectors, attributes, and behavior patterns supported by the component and its composite elements, if any.
The TreeList is a composite component that consists of 2 logically separated structural elements:
- Toolbar (
role=toolbar); - Tree Grid (
role=treegrid);
TreeList Toolbar
TreeList Toolbar follows the specification of the ToolBar component.
ToolBar accessibility specification
| Selector | Attribute | Usage |
|---|---|---|
.k-grid-toolbar | role=toolbar | The toolbar is a collection of command buttons and inputs. |
aria-label | Clarifies the purpose of the toolbar. | |
aria-controls=.k-grid-aria-root id | Pointing to the id of the element with role=treegrid. |
Tree Grid
The element with role=treegrid must not include the ToolBar element as it does not belong to the role=treegrid element itself. It implements the ARIA specification for the Grid component with some exceptions listed below.
Grid accessibility specification
In the Kendo jQuery TreeList, the role=treegrid is assigned to the <table> in the k-grid-content element.
The below table lists the ARIA requirements for the TreeList which are not present in the Grid specification:
| Selector | Attribute | Usage |
|---|---|---|
.k-grid-content>table | role=treegrid | The role specifies the element is a TreeGrid. |
.k-table-tbody .k-table-row | aria-expanded=true/false | Set on the currently expanded row(s). |
.k-table-tbody .k-i-caret-alt-down,.k-table-tbody .k-i-caret-alt-right,.k-table-tbody .k-svg-i-caret-alt-down,.k-table-tbody .k-svg-i-caret-alt-right | aria-hidden=true | Removes the expand/collapse icon from the accessibility tree. |
Resources
WAI-ARIA specification for tree grid
Section 508
The TreeList is fully compliant with the Section 508 requirements.
Testing
The TreeList has been extensively tested automatically with axe-core and manually with the most popular screen readers.
To report any accessibility issues, contact the team through the Telerik Support System.
Screen Readers
The TreeList has been tested with the following screen readers and browsers combinations:
| Environment | Tool |
|---|---|
| Firefox | NVDA |
| Chrome | JAWS |
| Microsoft Edge | JAWS |
Automated Testing
The TreeList has been tested with axe-core.
Test Example
A live test example of the TreeList component could be found here: https://demos.telerik.com/kendo-ui/accessibility/treelist