Lightning Aura Components Developer Guide

Introducing Aura Components
Quick Start
Creating Components
Component Names
Create Aura Components in the Developer Console
Create Aura Components Using Salesforce CLI
Component Markup
Component Namespace
Component Bundles
Component IDs
HTML in Components
CSS in Components
Component Attributes
Using Expressions
Component Composition
Component Body
Component Facets
Controlling Access
Using Object-Oriented Development
Best Practices for Conditional Markup
Aura Component Versioning for Managed Packages
Base Components with Minimum API Version Requirements
Validations for Aura Component Code
Using Labels
Using Custom Labels
Input Component Labels
Dynamically Populating Label Parameters
Getting Labels in JavaScript
Getting Labels in Apex
Setting Label Values via a Parent Attribute
Localization
Working with Lightning Base Components
Supporting Accessibility
Writing Documentation for the Component Library
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components
Debugging
Performance
Reference
PDF

Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Input Component Labels

A label describes the purpose of an input component. To set a label on an input component, use the label attribute.

This example shows how to use labels using the label attribute on an input component.

1<lightning:input type="number" name="myNumber" label="Pick a Number:" value="54" />

The label is placed on the left of the input field and can be hidden by setting variant="label-hidden", which applies the slds-assistive-text class to the label to support accessibility.

Using $Label

Use the $Label global value provider to access labels stored in an external source. For example:

1<lightning:input type="number" name="myNumber" label="{!$Label.Number.PickOne}" />
To output a label and dynamically update it, use the format() expression function. For example, if you have np.labelName set to Hello {0}, the following expression returns Hello World if v.name is set to World. 
1{!format($Label.np.labelName, v.name)}