Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Component Names
Create Aura Components in the Developer Console
Component Markup
Component Namespace
Component Bundles
Component IDs
HTML in Components
CSS in Components
Component Attributes
Supported aura:attribute Types
Basic Types
Function Type
Object Types
Standard and Custom Object Types
Collection Types
Custom Apex Class Types
Framework-Specific Types
Using Expressions
Component Composition
Component Body
Component Facets
Controlling Access
Using Object-Oriented Development
Best Practices for Conditional Markup
Aura Component Versioning
Components with Minimum API Version Requirements
Validations for Aura Component Code
Using Labels
Localization
Providing Component Documentation
Working with Base Lightning Components
Working with UI Components
Supporting Accessibility
Using Components
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Using Apex
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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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