Blazor Upload Accessibility
Out of the box, the Telerik UI for Blazor Upload provides extensive accessibility support and enables users with disabilities to acquire complete control over its features.
The Upload is compliant with the Web Content Accessibility Guidelines (WCAG) 2.2 AAA 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 Upload selected files list implements roving tabindex navigation. Meaning that only one file has tabindex=0.
| Selector | Attribute | Usage |
|---|---|---|
.k-upload .k-upload-button | aria-disabled=true/false | Announces the disabled state of the upload button. |
aria-expanded=true/false | Indicates whether the controlled list of files is present/visible | |
aria-controls=.k-upload-files id | Creates the relationship between the button and the list of selected files when the list is present. Remove the attribute when list is not present. | |
.k-upload input | tabindex=-1 | Assures that the input element inside the upload is not focusable. |
aria-hidden=true | The input needs to be hidden from the readers. | |
.k-upload-files | role=list | Explicitly sets the UL role to list because of https://developer.mozilla.org/en-US/docs/Web/CSS/list-style#accessibility_concerns |
id | Unique and deterministic id linked to the button aria-controls attribute. | |
.k-upload-files .k-file | role=listitem | Explicitly sets the LI role to listitem because of https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/listitem_role#best_practices (note 2). |
tabindex=0/-1 | The element should be focusable. Value should be changed dynamically based on the roving tabindex navigation. | |
.k-upload .k-file .k-file-validation-message | aria-live=polite | Announces the change in the upload status of the file. |
.k-upload .k-upload-actions .k-upload-action | aria-hidden=true | The list file action buttons must be hidden from the readers. |
tabindex=-1 | Assures that the list file action buttons are not focusable elements. |
Resources
Section 508
The Upload is fully compliant with the Section 508 requirements.
Testing
The Upload 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 Upload has been tested with the following screen readers and browsers combinations:
| Environment | Tool |
|---|---|
| Firefox | NVDA |
| Chrome | JAWS |
| Microsoft Edge | JAWS |
Keyboard Navigation
For details on how the Upload keyboard navigation works, refer to the Blazor Upload Accessibility and Keyboard Navigation Demo.