#ctx.on()

Subscribe to context events in RunJS (e.g. field value change, property change, resource refresh).

Events are mapped to custom events on ctx.element or an internal event bus. Refer to component docs for available event names.

#Type definition (simplified)

on(eventName: string, handler: (event?: any) => void): void;

#Common event examples

• js-field:value-change: custom field value change
• resource:refresh: resource refresh

#Example

React.useEffect(() => {
  const handler = (ev) => setValue(ev?.detail ?? '');
  ctx.on('js-field:value-change', handler);
  return () => {
    ctx.off?.('js-field:value-change', handler);
  };
}, []);