Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Debugging
Fixing Performance Warnings
Reference
Component Library (Beta)
Supported aura:attribute Types
Basic Types
Function Type
Object Types
Standard and Custom Object Types
Collection Types
Custom Apex Class Types
Framework-Specific Types
System Tag Reference
Component Reference
Messaging Component Reference
Interface Reference
Event Reference
System Event Reference
Supported HTML Tags
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Function Type

An attribute can have a type corresponding to a JavaScript function. If a child component has an attribute of this type, you can pass a callback from a parent component that contains the child component.
1<aura:attribute name="callback" type="Function" />

For an example of using this type with aura:method, see Return Result for Asynchronous Code.

Don’t send attributes with type="Function" to the server. These attributes are intended to only be used on the client side.

The most robust way to communicate between components is to use an event. If you get an error in a component with an attribute of type Function, fire an event in the child component instead and handle it in the parent component.

Note