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
Override Buttons, Links, and Tabs with Visualforce
Using Static Resources
Creating and Using Custom Components
Dynamic Visualforce Bindings
Dynamic Visualforce Components
Integrate Email with Visualforce
Visualforce Charting
Creating Maps with Visualforce
Render Flows with Visualforce
Templating with Visualforce
Developing Salesforce Apps with Visualforce
Adding Visualforce to a Salesforce AppExchange App
Using JavaScript in Visualforce Pages
Communicating Across the DOM with Lightning Message Service
Visualforce Best Practices
Standard Visualforce Component Reference
Appendices
Global Variables, Functions, and Expression Operators
Global Variables
$Action
$Api
$Asset
$Cache.Org
$Cache.Session
$Component
$ComponentLabel
$CurrentPage
$FieldSet
$Label
$Label.Site
$MessageChannel
$Network
$ObjectType
$Organization
$Page
$Permission
$Profile
$Resource
$SControl
$Setup
$Site
$System.OriginDateTime
$User
$User.UITheme and $User.UIThemeDisplayed
$UserRole
Functions
Expression Operators
Security Tips for Apex and Visualforce Development
Apex Classes Used in Visualforce Controllers
Execution Governors and Limits
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$User

A global merge field type to use when referencing information about the current user. User merge fields can reference information about the user such as alias, title, and ID.
Most of the fields available on the User standard object are also available on $User.

Usage

Use dot notation to access the current user’s information. For example:
1{!IF (CONTAINS($User.Alias, Smith) True, False)}

Example

The following example displays the current user’s company name, as well as the status of the current user (which returns a Boolean value). 
1<apex:page>
2  <h1>Congratulations</h1>
3   This is your new Apex Page
4   <p>The current company name for this 
5      user is: {!$User.CompanyName}</p>
6   <p>Is the user active?  
7      {!$User.isActive}</p>
8</apex:page>