Blazor DropDownList Accessibility
The Telerik UI for Blazor DropDownList component is WCAG 2.1 AA and Section 508 compliant. The component also follows the WAI-ARIA best practices for implementing the keyboard navigation for its component role, and is tested against the popular screen readers.
Wai-Aria
DropDownList wrapper
| Selector | Attribute | Usage |
|---|---|---|
| .k-dropdownlist | role=combobox |
Announces the button dropdown element. |
label for or aria-label or aria-labelledby
|
The input needs an accessible name to be assigned to it. | |
aria-haspopup=listbox |
Indicates the presence of a listbox popup. | |
aria-expanded=true/false |
Announces the state of the visibility of the popup. | |
aria-controls=.k-list-ul id |
Points to the popup element. Signifies that the combobox element controls the listbox. |
|
aria-describedby=.k-input-inner id |
Announces the selected value of the dropdown. | |
aria-activedescendant=.k-list-item.k-focus id |
Points to the focused item in the popup. The focused item is changed via keyboard navigation. If the popup is not visible, the attribute should not point to any element or should be removed. | |
aria-readonly=true |
Attribute is rendered only when the dropdown is readonly. | |
aria-busy=true |
Attribute is rendered only when the dropdown is loading data. | |
tabindex=0 |
The element should be focusable. | |
| .k-invalid .k-input-inner,.ng-invalid .k-input-inner | aria-invalid=true |
Attribute is rendered only when the dropdown is in form and announces the valid state of the component. |
| .k-dropdownlist.k-disabled | aria-disabled=true |
Attribute is rendered only when the dropdown is disabled. |
| .k-input-button |
role=button or nodeName=button
|
The element should either be a <button> element or should have role="button" assigned. |
aria-label |
The button needs an accessible name to be assigned to it. | |
tabindex=-1 |
Button element should not be focusable. |
Popup
| Selector | Attribute | Usage |
|---|---|---|
| .k-list-filter>.k-searchbox>.k-input-inner | role=searchbox |
Announces the searchbox capability of the input. |
aria-label |
Points to search label. | |
aria-activedescendant=.k-list-item.k-focus id |
Points to the focused item. Either an item from the popup. | |
aria-autocomplete=list |
Indicates the list filtering capabilities of the select. | |
aria-controls=.k-list-ul id |
Points to the popup element. Builds relationship between the input and the popup. | |
aria-haspopup=listbox |
Indicates the presence of a listbox popup. | |
| .k-list-ul | aria-live=polite/off |
Assures the live updates on the selected value of the popup. |
The ListBox placed in the Popup element of the component should implement the specification for a Popup List component.
| Selector | Attribute | Usage |
|---|---|---|
| .k-animation-container | role=region |
When the component container is appended to the <body> element of the document, it needs a landmark role to be assigned to it. Otherwise, it should 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. |
|
| .k-list-ul | role=listbox |
Identifies the ul element as a listbox. |
aria-label or aria-labelledby
|
Provides a label for the listbox of the combobox. | |
| .k-list-item | role=option |
Identifies the li element as a listbox option. |
| .k-list-item.k-selected | aria-selected=true |
Indicates the selected state of the item. |
Resources
ARIA practices: Select-Only Combobox Example
Section 508
The DropDownList is compliant with the Section 508 requirements
Testing
The component has been extensively tested automatically with static code analyzers and manually with the most popular screen readers.
Any Accessibility Issues could be reported in Telerik Support System.
Screen Readers
| Environment | Tool |
|---|---|
| Firefox | NVDA |
| Chrome | JAWS |
| Microsoft Edge | JAWS |