A critical requirement for software accessibility is keyboard support as a complete alternative to pointing devices (mouse, etc.). Keyboard support is comprised of navigation key, command key, keyboard navigation, and action keys. RadAsyncUpload seamlessly switches between mouse and keyboard navigation. As a part of Q2 2013 RadAsyncUpload control introduced fully built-in keyboard support.
Setting the control's KeyboardNavigationSettings (introduced in R2 2016 - ver.2016.2.504), allows you to associate an activation combination (CommandKey + FocusKey), which moves focus directly to the RadAsyncUpload and enables keyboard navigation. When there are multiple AsyncUpload controls on a given page, each of them may have a different activation combination.
The KeyboardNavigationSettings exposes two properties to configure the keyboard combination that sets focus to the control:
FocusKey: An upper-case letter or number.
CommandKey: [Ctrl] , [Alt] or [Shift].
Pressing the keys set to these two properties at the same time places the focus on the AsyncUpload. The user can then use the action keys for triggering specific action or the [Tab] key for navigation.
Example 1: Setting the KeyboardNavigationSettings for RadAsyncUpload
<telerik:RadAsyncUpload RenderMode="Lightweight" ID="RadAsyncUpload1" runat="server" > <KeyboardNavigationSettings CommandKey="Alt" FocusKey="P" /> </telerik:RadAsyncUpload>
Note that in some browsers certain keyboard combinations are already occupied and used by the browser itself.
To enable keyboard support for Internet Explorer 9 or earlier, you will have to set the DisablePlugins property to true .
RadAsyncUpload uses [Space] key to activate the "File Upload" dialog window.
RadAsyncUpload allows end-users to navigate through the selected files structure using the [Tab] and [Shift] + [Tab]. To delete a file from the list the user should press [Enter] while focus is on the respective file: