Function echo2

echo2(wgt, evtnm, data): void
Ask the client to echo back an AU request with the specified evant name and the target widget.
Parameters
- wgt: Widget<HTMLElement>
  the target widget to which the AU request will be sent
- evtnm: string
  the name of the event, such as onUser
- data: unknown
  any data
Returns void
See
- zk.AuCmd0#echo
- zk.AuCmd0#echoGx