Adds an event handler that runs when a keyboard key is pressed while the container or one of its child elements is focused.
A container receives a keyPress event when a site visitor presses a keyboard key on
the container or any of its child elements. A keyboard event is triggered for any child elements inside the container that support onKeyPress().
A keyPress event is fired for printable and non-printable characters.
Notes:
Some browsers don't issue a key press event for certain keys, such as arrow keys or the shift key.
When you retrieve the value from the target property of a KeyboardEvent,
you get the value of the target element before the key was pressed.
eventHandler(event: KeyboardEvent): void The name of the function or
the function expression to run when a key is pressed.