Learning Salesforce Lightning Application Development

Handling capturing and bubbling events

A containment hierarchy is a component tree hierarchy, from its top-level parent to its child. The bubble phase and the capture phase do not follow the rule that every parent component can handle the event. By default, the owner of the component can handle an event raised during the bubble or capture phase. Note that we are only referring to the bubble or capture phase here; for the default phase, this rule does not apply.

For declaratively created components, the owner is the outermost component containing the markup that references the component firing the event. For programmatically created components, the owner component is the component that invoked $A.createComponent to create the component.