Declaring a Remote Method with Interface Parameters

You can declare @RemoteAction methods with interface parameters and return types, instead of being restricted to concrete classes. This, for example, allows a package provider to package a remote method and associated interface, which subscriber organizations can call from Visualforce pages, passing in their own class that implements the packaged interface.

Here’s a brief example:

Objects sent from a JavaScript remoting call to a @RemoteAction that declares interface parameters must include an apexType value, which must be a fully-qualified path to the concrete class, that is, namespace[.BaseClass][.ContainingClass].ConcreteClass. For example, to make a JavaScript remoting call to the above controller:

If the class definition is within your organization, you can simplify the remoting call, and also use the default c namespace:

Visualforce Developer Guide

Declaring a Remote Method with Interface Parameters