Accessibility Support
Out of the box, the Telerik and Kendo UI DropDownTree provides extensive accessibility support and enables users with disabilities to acquire complete control over its features.
The DropDownTree is compliant with the Web Content Accessibility Guidelines (WCAG) 2.2 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.
DropDownTree Wrapping Element
The following table summarizes the selectors and attributes supported by the DropDownTree wrapper element:
| Selector | Attribute | Usage |
|---|---|---|
.k-dropdowntree | role=combobox | Announces the drop-down element of the button. |
label for or aria-label or aria-labelledby | The input requires an accessible name that will be assigned to it. | |
aria-haspopup=tree | Indicates the presence of a popup with a tree navigation. | |
aria-expanded=true/false | Announces the state of the popup visibility. | |
aria-controls=.k-treeview id | Points to the treeview element. Signifies that the combobox element controls the treeview one. | |
aria-describedby=.k-input-inner id | Announces the selected value of the drop-down. | |
aria-readonly=true | The attribute is rendered only when the drop-down is read-only. | |
aria-autocomplete=list | The attribute is rendered and the value is set to list when the filtering feature is enabled. | |
aria-invalid=true | The attribute is rendered only when the drop-down is in a form and announces the valid state of the component. | |
aria-busy=true | The attribute is rendered only when the drop-down is loading data. | |
tabindex=0 | The element must be focusable. | |
.k-dropdowntree.k-disabled | aria-disabled=true | The attribute is rendered only when the drop-down is disabled. |
.k-input-button | role=button or nodeName=button | The element must either be a <button> element or must have role="button" assigned. |
aria-label | The button requires an accessible name that will be assigned to it. | |
tabindex=-1 | The button element must not be focusable. |
Popup Listbox
The popup element of the DropDownTree has to implement the WAI-ARIA specification for a Popup List component. The following table summarizes the selectors and attributes supported by the listbox popup of the DropDownTree:
| Selector | Attribute | Usage |
|---|---|---|
.k-animation-container | role=region | When the component container is appended to the <body> element of the document, it requires you to assign a landmark role to it. Otherwise, it must be appended to an element with an appropriate landmark role. |
aria-label or aria-labelledby | Provides a label when the container has a region role assigned. |
TreeView
The tree that is placed in the popup element of the component must implement the specification for a TreeView component.
Keyboard Shortcuts
This section lists the keyboard shortcuts supported by the DropDownTree composite elements.
DropDownTree Wrapping Element
The following table summarizes the keyboard combinations and input behavior supported by the DropDownTree wrapper element:
| Shortcut | Behavior |
|---|---|
Down Arrow | Selects the next available item. |
Up Arrow | Selects the previous available item. |
Alt/Opt(Mac) Down | Opens the popup. |
Alt (or Opt on Mac) + Up Arrow or Esc | `Closes the popup. |
Enter | Selects and confirms the focused item. |
Esc | Clears the value when the popup is not open. |
Listbox Popup
The treeview element inside the popup must implement the keyboard navigation specification for a TreeView component:
Testing
The DropDownTree has been extensively tested automatically with axe-core and manually with the most popular screen readers.
Screen Readers
The DropDownTree has been tested with the following screen readers and browsers combinations:
| Environment | Tool |
|---|---|
| Firefox | NVDA |
| Chrome | JAWS |
| Microsoft Edge | JAWS |
