New to Telerik UI for Blazor? Download free 30-day trial

Blazor DropDownList Accessibility

The Telerik UI for Blazor DropDownList is WCAG 2.1 AAA 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

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-activedescendent=.k-list-item 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-invalid=true Attribute is rendered only when the dropdown is in form and announces the valid state of the component.
aria-busy=true Attribute is rendered only when the dropdown is loading data.
tabindex=0 The element should be focusable.
.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.
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-activedescendent=.k-list-item.k-selected 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 PopupList 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

See Also

In this article