Visualforce Developer Guide

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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
Valid Values for the $Action Global Variable
$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
PDF

$Action

A global merge field type to use when referencing standard Salesforce actions, such as displaying the Accounts tab home page, creating accounts, editing accounts, and deleting accounts.

Usage

Use dot notation to specify an object and an action, for example, $Action.Account.New

Example

The following markup adds a link to create a new account: 
<apex:outputLink value="{!URLFOR($Action.Account.New)}">
    Create New Account
</apex:outputLink>
The following markup adds a link to download an attachment: 
<apex:page standardController="Attachment">
    <apex:outputLink 
      value="{!URLFOR($Action.Attachment.Download,
                      attachment.id)}">
      Download Now!
    </apex:outputLink>
</apex:page>