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Activity › Forums › Salesforce® Discussions › How to register, fire and handle a component and application event in Salesforce?

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  • shariq

    Member
    September 24, 2018 at 3:22 AM

    We register an event by using the following code

    <aura:registerEvent name=”sampleComponentEvent” type=”c:compEvent”/>

    We fire event as shown below:

    var compEvent = cmp.getEvent(“sampleComponentEvent”);
compEvent.fire();

    Handle component event as below:

    <aura:handler name=”sampleComponentEvent” event=”ns:eventName”
action=”{!c.handleComponentEvent}” phase=”capture” />

    Handle Application event as below:

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

  • Avnish Yadav

    Member
    September 28, 2018 at 7:09 AM

    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.

    Register an Event
    A component registers that it may fire an application event by using <aura:registerEvent> in its markup. The nameattribute is required but not used for application events. The name attribute is only relevant for component events. This example uses name="appEvent" but the value isn’t used anywhere.

    <aura:registerEvent name="appEvent" type="c:appEvent"/>

    Fire an Event
    Use $A.get("e.myNamespace:myAppEvent") in JavaScript to get an instance of the myAppEvent event in the myNamespacenamespace.

    The syntax to get an instance of an application event is different than the syntax to get a component event, which is cmp.getEvent("evtName").
    Use fire() to fire the event.

    var appEvent = $A.get("e.c:appEvent");
// Optional: set some data for the event (also known as event shape)
// A parameter’s name must match the name attribute
// of one of the event’s &lt;aura:attribute&gt; tags
//appEvent.setParams({ "myParam" : myValue });
appEvent.fire();

    Thanks.

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