JavaScript Remoting
JavaScript remoting allows a controller method to be invoked directly from JavaScript with no Visualforce components necessary. Instead, you annotate the controller method with @RemoteAction and write a small amount of JavaScript to call it.
Although similar in function to JavaScript remoting, the actionFunction Visualforce component differs in some significant ways. The actionFunction component is designed for use in a Visualforce page with other native Visualforce components. Like most Visualforce components, it uses a form to create a stateful interaction between the controller and the page. This is not the case with remoting, which makes it a bit more responsive as a result. Remoting is also asynchronous, while the actionFunction ...
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