Remote Methods and Inheritance

You can call remote actions on your Apex controller that are inherited methods. When a @RemoteAction method is looked up or called, Visualforce inspects the page controller’s inheritance hierarchy and finds @RemoteAction methods in the controller’s ancestor classes.

Here’s an example demonstrating this capability. The following Apex classes form a three-tier inheritance hierarchy:

1global with sharing class ChildRemoteController 
2    extends ParentRemoteController { }
3global virtual with sharing class ParentRemoteController 
4    extends GrandparentRemoteController { }
5
6global virtual with sharing class GrandparentRemoteController {
7    @RemoteAction
8    global static String sayHello(String helloTo) {
9        return 'Hello ' + helloTo + ' from the Grandparent.';
10    }
11}

This Visualforce page simply calls the sayHello remote action.

1swfobject.registerObject("clippy.codeblock-1", "9");
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17<apex:page controller="ChildRemoteController" >
18    <script type="text/javascript">
19        function sayHello(helloTo) {
20            ChildRemoteController.sayHello(helloTo, function(result, event){
21                if(event.status) {
22                    document.getElementById("result").innerHTML = result;
23                }
24            });
25        }
26    </script>
27
28    <button onclick="sayHello('Jude');">Say Hello</button><br/>
29    <div id="result">[Results]</div>
30    
31</apex:page>

The remote method doesn’t exist in the ChildRemoteController class. Instead, it’s inherited from GrandparentRemoteController.

Visualforce Developer’s Guide

Remote Methods and Inheritance