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
$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

$Setup

A global merge field type to use when referencing a custom setting of type “hierarchy.”

Usage

Use $Setup to access hierarchical custom settings and their field values using dot notation. For example, $Setup.App_Prefs__c.Show_Help_Content__c.

Hierarchical custom settings allow values at any of three different levels:
  1. Organization, the default value for everyone
  2. Profile, which overrides the Organization value
  3. User, which overrides both Organization and Profile values
Salesforce automatically determines the correct value for this custom setting field based on the running user’s current context.

Custom settings of type “list” aren’t available on Visualforce pages using this global variable. You can access list custom settings in Apex.

Example

The following example illustrates how to conditionally display an extended help message for an input field, depending on the user’s preference:
<apex:page>
    <apex:inputField value="{!usr.Workstation_Height__c}"/>
    <apex:outputPanel id="helpWorkstationHeight" 
        rendered="{!$Setup.App_Prefs__c.Show_Help_Content__c}">
        Enter the height for your workstation in inches, measured from the 
        floor to top of the work surface.
    </apex:outputPanel>
    ...
</apex:page>
If the organization level for the custom setting is set to true, users see the extended help message by default. If an individual prefers to not see the help messages, they can set their custom setting to false, to override the organization (or profile) value.