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 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
Visualforce Remote Objects
Best Practices
Standard Component Reference
Appendices
Glossary
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JavaScript Remoting Limits and Considerations

Although JavaScript remoting isn’t subject to some resource limits, it does come with limits of its own.

JavaScript remoting isn’t a way to avoid Salesforce service limits. JavaScript remoting calls aren’t subject to API limits, but Visualforce pages that use JavaScript remoting are subject to all standard Visualforce limits.

By default, the response of the remote call must return within 30 seconds, after which the call will time out. If your request needs longer to complete, configure a longer timeout, up to 120 seconds.

The request, including headers, has a maximum size of 4 MB.

The response of the remote call has a maximum size of 15 MB. If your JavaScript remoting code is exceeding this limit, you have several options:
  • Reduce the size of the response for each request. Only return data that’s required.
  • Break up large data retrieval into requests that return smaller chunks.
  • Make batched requests more frequently, reducing the size of each individual batch.
  • Use non-batched requests. Set { buffer: false } in your remoting request configuration block.

Salesforce logs error messages from some JavaScript remoting calls. You can prevent personal information from being logged by not including customer data in error messages. Instead, catch exceptions and log the full message. Then return a user-friendly message to your Visualforce page.