Using Aura method to pass value from Child component to Parent component (with example)

In this blog, we will discuss how to 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.

The <aura:method> tag has following attributes:

Attribute	Type	Description
name	String	The method name. In other words, you can use the method name to call the method in JavaScript code.
action	Expression	The client-side controller action to execute.
access	String	The access control for the method. Valid values are: public—Any component in the same namespace can call the method. This is the default access level. global—Any component in any namespace can call the method.
description	String	The method description.

An <aura:method> can optionally include parameters. We use an <aura:attribute> tag within an <aura:method> to declare a parameter for the method.

Example

In the below example, we are creating a Parent component aura method with two parameters. These two parameters are ‘GreetingParam’ and ‘PersonNameParam’. After that, we assign these parameters default values of ‘Hello’ and ‘John’ respectively.

ParentComponent

We can define the component using the following code.

<aura:component>
<aura:method name="greetingMethod" action="{!c.getMessage}" access="public">
	<aura:attribute name="GreetingParam" type="String" default="Hello"/> 
	<aura:attribute name="PersonNameParam" type="String" default="John"/> 
</aura:method>
</aura:component>

ParentComponentController

Firstly, in Parent Component controller, we are getting the value of parameters and showing alert.

({
    getMessage : function(component, event) {
        //get method paramaters
        var params = event.getParam('arguments');
        if (params) {
            var param1 = params.GreetingParam;
            var param2 = params.PersonNameParam;
            alert(param1 + " " + param2);
        }
    }
})

ChildComponent

Now in child component we are declaring aura:attribute of type Aura.Component, so we can store parent component reference. Also added button for calling child component controller method.

<aura:attribute name="parent" type="Aura.Component"/>
<lightning:button variant="brand" label="Invoke Parent Method" onclick="{!c.callParentMethod}" />

ChildComponentController

Similarly, in ChildComponentController, we have to get the parent component and calling it’s aura method.

({
	callParentMethod : function(component, event, helper) {
        //Call Parent aura method
        var parentComponent = component.get("v.parent");                         
		parentComponent.greetingMethod()
    }
})

Updated ParentComponent

After that, in the Parent component, we need to add child component and pass the reference in it.

<aura:component>
<aura:method name="greetingMethod" action="{!c.getMessage}" access="public">
	<aura:attribute name="GreetingParam" type="String" default="Hello"/> 
	<aura:attribute name="PersonNameParam" type="String" default="John"/> 
</aura:method>
<c:ChildComponent parent="{!this}"></c:ChildComponent>
</aura:component>

Here is output when users click on Invoke Parent Method button. Output is ‘Hello John’ because no value of parameter is passed. So it is showing default value.

Aura Component Example

In the above example, we are using parameters of the parent component. We can also pass parameters from child component to parent component like this:

({
	callParentMethod : function(component, event, helper) {
        //Call Parent aura method
        var parentComponent = component.get("v.parent");                         
		parentComponent.greetingMethod('Happy coding','session')
    }
})

Now when the user click on the Invoke Parent Method button on the child component. The output will be ‘Happy coding session’ instead of ‘Hello John’ because we are passing the value of attributes.

aura:method always executes synchronously so method execution finishes before it returns.

We hope you may find this blog resourceful and helpful. If you still have concerns and need more help, please contact us at salesforce@greytrix.com.

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