Problem calling applet method from script in svg file

[patc]

Hi there

I am trying to call an applet method from script within an svg file.  From
looking around the web, and especially this forum, the basic idea to achieve
this is to:

- Extend JSVGCanvas to allow access to the BridgeContext.
- Obtain the javascript interpreter from the BridgeContext.
- Create a mapping between the applet and new custom type.
- Call the custom type (applet mapping) from within svg script.

Here's my applet code:

public class SVGScriptApplet extends Applet {
        private static class MyCanvas extends JSVGCanvas {              
                public void setBridgeContext(SVGOMDocument doc){
                        bridgeContext = createBridgeContext(doc);
                }
                public BridgeContext getBridgeContext() {
                                      return bridgeContext;
                          }
             }        
    
    public void init() {
        String parser = XMLResourceDescriptor.getXMLParserClassName();
        SAXSVGDocumentFactory f = new SAXSVGDocumentFactory(parser);
            try{                
                MyCanvas canvas = new MyCanvas();
                URL url = new URL(getCodeBase(), "3D.svg");
                SVGOMDocument svgDoc =
(SVGOMDocument)f.createDocument(url.toString());
                canvas.setBridgeContext(svgDoc);                
                // 'Unknown document' exception encountered if the following 2
lines are not included
                GVTBuilder builder   = new GVTBuilder();
                builder.build(canvas.getBridgeContext(), svgDoc);               
                Interpreter i =
canvas.getBridgeContext().getInterpreter("text/ecmascript");            
                i.bindObject("appletHost", this);
                canvas.setDocument(svgDoc);
            }catch (Exception e){
                System.out.println(e);
            }
    }
    public void doSomething() {
        System.out.println("Do something!");
    }
}

This applet loads the 3D.svg that comes in samples directory of Batik 1.7
release (in order to keep things simple and easily reproducable).

I have updated the 3D.svg file to reference the applet and call
'doSomething()' method:

<svg xmlns="http://www.w3.org/2000/svg"; 
     xmlns:xlink="http://www.w3.org/1999/xlink";
     id="body" width="640" height="480" viewBox="0 0 640 480">

    <script type="text/ecmascript"><![CDATA[

     .....
     // Global initialization
     function startAnimation(evt) {
          appletHost.doSomething();
          .....
     }
     ....

Unfortunately the interpreter does not seem to take note of the mapping of
type of name 'appletHost' with the applet, and I get the following
exception;

org.mozilla.javascript.WrappedException: Wrapped
org.mozilla.javascript.EcmaError: ReferenceError: "appletHost" is not
defined. (Inline <script> http://localhost:8080/FO5/applet/3D.svg:-1#107)
(Event attribute http://localhost:8080/FO5/applet/3D.svg:-1 onload#1)
at
org.apache.batik.script.rhino.BatikSecurityController.callWithDomain(Unknown
Source)
        at org.mozilla.javascript.Interpreter.interpret(Unknown Source)
        at org.mozilla.javascript.InterpretedFunction.call(Unknown Source)
        at org.mozilla.javascript.Interpreter.interpretLoop(Unknown Source)
        at script(Event attribute http://localhost:8080/FO5/applet/3D.svg:-1
onload:1)
        at org.mozilla.javascript.Interpreter.interpret(Unknown Source)
        at org.mozilla.javascript.InterpretedFunction.call(Unknown Source)
        at org.apache.batik.script.rhino.BatikSecurityController$1.run(Unknown
Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at
org.apache.batik.script.rhino.BatikSecurityController.callWithDomain(Unknown
Source)
        at org.mozilla.javascript.Interpreter.interpret(Unknown Source)
        at org.mozilla.javascript.InterpretedFunction.call(Unknown Source)
        at org.mozilla.javascript.ContextFactory.doTopCall(Unknown Source)
        at org.mozilla.javascript.ScriptRuntime.doTopCall(Unknown Source)
        at org.mozilla.javascript.InterpretedFunction.exec(Unknown Source)
        at org.mozilla.javascript.Context.evaluateReader(Unknown Source)
        at org.apache.batik.script.rhino.RhinoInterpreter$2.run(Unknown Source)
        at org.mozilla.javascript.Context.call(Unknown Source)

Not really sure what I am doing wrong.  Is there something I am missing?

Any help greatly appreciated

Pat
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