aura:method

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.

The <aura:method> tag has these system attributes.

Attribute	Type	Description
`name`	`String`	The method name. Use the method name to call the method in JavaScript code. For example: `1cmp.sampleMethod(param1);`
`action`	`Expression`	The client-side controller action to execute. For example: `1action="{!c.sampleAction}"` `sampleAction` is an action in the client-side controller. If you don’t specify an `action` value, the controller action defaults to the value of the method `name`.
`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.

Declaring Parameters

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

1<aura:method name="sampleMethod" action="{!c.doAction}" 
2  description="Sample method with parameters"> 
3    <aura:attribute name="param1" type="String" default="parameter 1"/> 
4    <aura:attribute name="param2" type="Object" /> 
5</aura:method>

You don’t need an access system attribute in the <aura:attribute> tag for a parameter.

Note

Creating a Handler Action

This handler action shows how to access the arguments passed to the method.

1({
2    doAction : function(cmp, event) {
3        var params = event.getParam('arguments');
4        if (params) {
5            var param1 = params.param1;
6            // add your code here
7        }
8    }
9})

Retrieve the arguments using event.getParam('arguments'). It returns an object if there are arguments or an empty array if there are no arguments.

Returning a Value

aura:method executes synchronously.

A synchronous method finishes executing before it returns. Use the return statement to return a value from synchronous JavaScript code. See Return Result for Synchronous Code.
An asynchronous method may continue to execute after it returns. Use a callback to return a value from asynchronous JavaScript code. See Return Result for Asynchronous Code.

Lightning Aura Components Developer Guide

aura:method

Declaring Parameters

Creating a Handler Action

Returning a Value

See Also