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
Using $Component to Reference Components from JavaScript
Using JavaScript Libraries with Visualforce
JavaScript Remoting for Apex Controllers
What Is JavaScript Remoting?
When to Use JavaScript Remoting
Adding JavaScript Remoting to a Visualforce Page
Declaring a Remote Method in Apex
Handling the Remote Response
Debugging JavaScript Remoting
JavaScript Remoting Limits and Considerations
JavaScript Remoting Example
Common Visualforce JavaScript Remoting API Validation Errors
Visualforce Remote Objects
Communicating Across the DOM with Lightning Message Service
Visualforce Best Practices
Standard Visualforce Component Reference
Appendices
PDF

JavaScript Remoting for Apex Controllers

Use JavaScript remoting in Visualforce to call methods in Apex controllers from JavaScript. Create pages with complex, dynamic behavior that isn’t possible with the standard Visualforce AJAX components.
Features implemented using JavaScript remoting require three elements:
  • The remote method invocation you add to the Visualforce page, written in JavaScript.
  • The remote method definition in your Apex controller class. This method definition is written in Apex, but there are some important differences from normal action methods.
  • The response handler callback function you add to or include in your Visualforce page, written in JavaScript.
JavaScript remoting allows you to make remote requests to Visualforce.