Call JavaScript method in FXML from java controller

Question

I have fxml like
   <fx:root type="javafx.scene.Group" xmlns:fx="http://javafx.com/fxml">
    <fx:script>
        function applyState(oldState, newState)
    </fx:script>   
    ....and controller to it.
The idea is to move some view logic to fxml file.
So, when I need to change some view state, I want to call applyState from java code.
The question is how to do it.
What I have found:
We can get
fxmlLoader.getNamespace().get("applyState")and receive sun.org.mozilla.javascript.internal.InterpretedFunction.
NetBeans see this class. But while building the project i have an error
error: package sun.org.mozilla.javascript.internal does not exist
But this class really exists in rt.jar in JRE.
After that I have stopped digging into this.
I suspect that using internal API is not a good idea to call this InterpretedFunction.
Can somebody suggest how can I make such an invocation?
Edited by: 940811 on Nov 19, 2012 11:21 PM

Answer 1

Until JavaFX doesn't expose the ScriptEngine instance of FXMLLoader, there's no way to communicate (Java <-> Javascript) with the <fx:script>.
But, if you want to rely on a hack, you can do this:
    private ScriptEngine extractScriptEngine(FXMLLoader loader) {
        try {
            Field fse = loader.getClass().getDeclaredField("scriptEngine");
            fse.setAccessible(true);
            return (ScriptEngine) fse.get(loader);
        } catch (IllegalAccessException | NoSuchFieldException | SecurityException ex) {
            Logger.getLogger(BrowserFXController.class.getName()).log(Level.SEVERE, null, ex);
        return null;
    }