Lightning Components Developer's Guide

Introducing the Lightning Component Framework
Quick Start
Creating Components
Working with UI Components
Using Expressions
Supporting Accessibility
Communicating with Events
Handling Events with Client-Side Controllers
Actions and Events
Component Events
Application Events
Handling Application Events
Application Event Example
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 Application Events

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

The action attribute of <aura:handler> sets the client-side controller action to handle the event. For example:

1<aura:handler event="c:appEvent" action="{!c.handleApplicationEvent}"/>

When the event is fired, the handleApplicationEvent client-side controller action is called.