Lightning Components Developer's Guide

Introducing the Lightning Component Framework
Quick Start
Creating Components
Working with UI Components
Using Expressions
Supporting Accessibility
Communicating with Events
Creating Apps
App Overview
Designing App UI
Creating App Templates
Content Security Policy Overview
Styling Apps
Using JavaScript
JavaScript Cookbook
Using Apex
Creating Server-Side Logic with Controllers
Creating Components
Working with Salesforce Records
Testing Your Apex Code
Making API Calls from Apex
Using Object-Oriented Development
Using the AppCache
Controlling Access
Distributing Applications and Components
Debugging
Reference
PDF

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Using Apex

Use Apex to write server-side code, such as controllers and test classes.

Server-side controllers handle requests from client-side controllers. For example, a client-side controller might handle an event and call a server-side controller action to persist a record. A server-side controller can also load your record data.