Use <aura:method> to define a method as part of a component’s API.

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.


Sample Code:


Lightning App:


<aura:application >
    <c:myLightningComponent/>

</aura:application>


Lightning Component:


<aura:component >
    <aura:method name=”compMtd” action=”{!c.callFromCompMetd}”>
        <aura:attribute type=”String” name=”Str” default=”testing”/>
    </aura:method>
    <ui:button label=”Click” press=”{!c.callBtn}”/>
</aura:component>


Lightning Controller:


({
callBtn : function(component, event, helper) {
component.compMtd();
},
    callFromCompMetd : function(component, event, helper) {
        var params = event.getParam(‘arguments’);
        if (params) {
            var param1 = params.Str;
    alert(param1);
        }
}
})


Output:

Cheers!!!