Lightning Components Developer’s Guide

Getting Started
Creating Components
Communicating with Events
Creating Apps
App Basics
Styling Apps
Using JavaScript
Accessing the DOM
Using External JavaScript Libraries
Working with Attribute Values in JavaScript
Working with a Component Body in JavaScript
Sharing JavaScript Code in a Component Bundle
Client-Side Rendering to the DOM
Modifying Components Outside the Framework Lifecycle
Validating Fields
Throwing and Handling Errors
Making API Calls
JavaScript Cookbook
Using Apex
Using Object-Oriented Development
Using the AppCache
Controlling Access
Distributing Applications and Components
Debugging
Reference
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Using JavaScript

Use JavaScript for client-side code. The Aura object is the top-level object in the JavaScript framework code. For all the methods available in the Aura class, see the JavaScript API at https://<mySalesforceInstance>.lightning.force.com/auradocs/reference.app, where <mySalesforceInstance> is the name of the instance hosting your org; for example, na1.

$A is the shorthand in JavaScript code for the Aura object.

A component bundle can contain JavaScript code in a client-side controller, helper, or renderer. Client-side controllers are the most commonly used of these JavaScript resources.

Expressions in JavaScript Code

In JavaScript, use string syntax to evaluate an expression. For example, this expression retrieves the label attribute in a component.

Only use the {! } expression syntax in markup in .app or .cmp resources.

Note