aura:method in Salesforce

• This enables you to directly call a method in a component’s client-side controller instead of firing and handling a component event.
• Using <aura:method> simplifies the code needed for a parent component to call a method on a child component that it contains. 

ParentComp:

<aura:component description="parentComponent" access="global" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes">

    <c:childComponent aura:id="childQuestion"/>

    <button type="button" aura:id="saveAndReturn" class="slds-button" onclick="{!c.save}">Save and return

    </button>  

</aura:component>

Controller:

({

    save : function(component,helper,event){

 var childComponent = component.find("childQuestion");

        childComponent.getScoreMethod('aa','bb','cc');

    }

})

childComponent.cmp

<aura:component description="childComponent" access="global">

    <aura:method name="getScoreMethod" action="{!c.calcScore}" access="PUBLIC">

        <aura:attribute name="contactId" type="String" />

        <aura:attribute name="contactName" type="String"  />

        <aura:attribute name="recordId" type="String"  />

    </aura:method>

</aura:component> 

({

    calcScore : function(component,event,helper){

        var args = event.getParam("arguments");

        var contactId = args.contactId;

        var contactName = args.contactName;

        var recod=args.recordId;

       alert('Inside Calc Score: ' + contactId + ' - ' + contactName+'-'+recod);

    }

})


Application:


<aura:application >
 <c:ParentComp/>
</aura:application>