Generic form submission handler
Use this hook to implement a handler on all submitted forms.
The form fields are available keyed under thisHook.const.params.
It is easier to handle submission of a single form by appending _ followed by the form name to this hook.
Prepare a form for display by adding or changing fields at the render stage
(static) registerWidget(widgetFunction, name)
Register a new form widget type
Widgets consist of a name and a function that is sent to the client to implement a custom form item.
Function that is executed client-side when the form is displayed.
The widget name.