Application Events

Application Event Propagation
The framework supports capture, bubble, and default phases for the propagation of application events. The capture and bubble phases are similar to DOM handling patterns and provide an opportunity for interested components to interact with an event and potentially control the behavior for subsequent handlers. The default phase preserves the framework’s original handling behavior.

Create Custom Application Events
Create a custom application event using the <aura:event> tag in a .evt resource. Events can contain attributes that can be set before the event is fired and read when the event is handled.

Fire Application Events
Application events follow a traditional publish-subscribe model. An application event is fired from an instance of a component. All components that provide a handler for the event are notified.

Handling Application Events
Use <aura:handler> in the markup of the handler component.

Lightning Components Developer Guide

See Also