Application v Component Events

In these two posts examples of application and component events are shown.

These two things should be pretty similar to each other but in this post I will provide a comparison of the differences.

 Area Application Event Component Event
 Example Lightning Event

<aura:event type=”APPLICATION” description=”Event template”>
<aura:attribute name=”message” type=”string”/>

 <aura:event type=”COMPONENT” description=”Event template”>
<aura:attribute name=”message” type=”string”/>
 Event Register

<aura:registerEvent name=”x’ type=”c:EvntMessage”/>

<aura:registerEvent name=”sendMessage” type=”c:CompEvntMessage”/>

 Event Handler

<aura:handler event=”c:EvntMessage” action=”{!c.handleMessage}”/>

<aura:handler name=”sendMessage” event=”c:CompEvntMessage” action=”{!c.handleMessage}”/>

Code to fire Event

var appEvent = $A.get(“e.c:EvntMessage”);
appEvent.setParams({ “message” : thisMessage });;

var compEvent = component.getEvent(“sendMessage”);
compEvent.setParams({ “message”: thisMessage });;

Where fires

Across all components on the page

Bubbles up to a high level component within the same lightning component



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