Visualforce Developer Guide

Introducing Visualforce
Tools for Visualforce Development
Getting a Quick Start with Visualforce
Customizing the Appearance and Output of Visualforce Pages
Standard Controllers
Standard List Controllers
Custom Controllers and Controller Extensions
Advanced Examples
Overriding Buttons, Links, and Tabs with Visualforce
Using Static Resources
Creating and Using Custom Components
Dynamic Visualforce Bindings
Dynamic Visualforce Components
Integrating Email with Visualforce
Visualforce Charting
Creating Maps with Visualforce
Render Flows with Visualforce
Templating with Visualforce
Developing for Mobile Devices
Adding Visualforce to a Force.com AppExchange App
Using JavaScript in Visualforce Pages
Best Practices
Standard Component Reference
Appendices
Global Variables, Functions, and Expression Operators
Global Variables
$Action
$Api
$Cache.Session
$Component
$ComponentLabel
$CurrentPage
$FieldSet
$Label
$Label.Site
$Network
$ObjectType
$Organization
$Page
$Permission
$Profile
$Resource
$SControl
$Setup
$Site
$System.OriginDateTime
$User
$User.UITheme and $User.UIThemeDisplayed
$UserRole
Functions
Expression Operators
Security Tips for Apex and Visualforce Development
Apex Classes Used in Visualforce Controllers
Execution Governors and Limits
Glossary
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$Label

A global merge field type to use when referencing a custom label.

Usage

Use this expression in a Visualforce page to access a custom label. The returned value depends on the language setting of the contextual user.​ The value returned is one of the following, in order of precedence:
  1. The local translation’s text
  2. The packaged translation’s text
  3. The master label’s text

Example

1<apex:page>
2   <apex:pageMessage severity="info" 
3   strength="1" 
4   summary="{!$Label.firstrun_helptext}" 
5   />
6</apex:page>