class ObservableObjectinterface

interface ObservableObject​.EventDelegate

A type of object that can be used to handle events from other (attached) objects.

interface EventDelegate;

Notes

• This interface must be matched by the delegate object that’s passed to ObservableObject.attach(), as part of the ObservableObject.AttachListener object argument.
• In practice, the required delegate method is often defined on the attached parent itself, to handle events from attached objects such as (nested) views. In that case, the parent object itself can be passed to ObservableObject.attach() as { delegate: this }.
• The delegate method is expected to return undefined or false if the event should be propagated on the parent object. Otherwise, the method should return true, or a promise for asynchronous error handling.

Instance members

• delegate()
  A required method that handles the provided event.

Related

• class ObservableObject
  The base class of all observable objects, which can be placed into a tree structure to enable event handling and data binding.
• attach() protected
  Attaches the specified observable object to this object.