Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Handling Events with Client-Side Controllers
Actions and Events
Component Events
Handling Component Events
Component Handling Its Own Event
Component Event Bubbling
Handling Component Events Dynamically
Component Event Example
Application Events
Event Handling Lifecycle
Advanced Events Example
Firing Lightning Events from Non-Lightning Code
Events Best Practices
Events Fired During the Rendering Lifecycle
Salesforce1 Events
System Events
Creating Apps
Debugging
Reference
PDF

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Handling Component Events

A component event can be handled by the component that fired the event or by a component in the containment hierarchy that receives the bubbled event.