JavaFx unable to execute javascript function

Question

I am using JavaFX to embed browser. I am trying to run a javascript function addnum() from java class WebScale, but i am getting error.If i execute document.write() from webengine.executeScript() it is possible. But i cant call my function. My code is as follow:

public class WebScale extends JApplet {
static ZoomingPane zoomingPane;
private static JFXPanel fxContainer;

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            final JFrame frame = new JFrame("Area Configurator");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            JApplet applet = new WebScale();
            applet.init();

            frame.setContentPane(applet.getContentPane());

            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);

            applet.start();

            frame.addComponentListener(new java.awt.event.ComponentAdapter() {
                @Override
                public void componentResized(java.awt.event.ComponentEvent evt) {
                    if (zoomingPane != null) {
                        zoomingPane.setZoomFactors((double)(frame.getWidth()/ 1280.0), (double)(frame.getHeight() / 800.0));
                    }
                }
            });
        }
    });
}

@Override
public void init() {
    fxContainer = new JFXPanel();
    fxContainer.setPreferredSize(new Dimension(800, 700));
    add(fxContainer, BorderLayout.CENTER);
    // create JavaFX scene
    Platform.runLater(new Runnable() {

        @Override
        public void run() {
            createScene();
        }
    });
}

private void createScene() {
    WebView webView = new WebView();
    zoomingPane = new ZoomingPane(webView);
    BorderPane bp = new BorderPane();
    bp.setCenter(zoomingPane);
    fxContainer.setScene(new Scene(bp));
    String strpath ;
    strpath="file:///C:/Users/Priyanka/Desktop/FDASH/StationV3/Main.html";


  final WebEngine engine = webView.getEngine();

   engine.load(strpath);

   engine.executeScript("addNum()");



}

private class ZoomingPane extends Pane {
    Node content;
    private final DoubleProperty zoomFactor = new SimpleDoubleProperty(1);
    private double zoomFactory = 1.0;

    private ZoomingPane(Node content) {
        this.content = content;
        getChildren().add(content);
        final Scale scale = new Scale(1, 1);
        content.getTransforms().add(scale);

        zoomFactor.addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                scale.setX(newValue.doubleValue());
                scale.setY(zoomFactory);
                requestLayout();
            }
        });
    }

    @Override
    protected void layoutChildren() {
        Pos pos = Pos.TOP_LEFT;
        double width = getWidth();
        double height = getHeight();
        double top = getInsets().getTop();
        double right = getInsets().getRight();
        double left = getInsets().getLeft();
        double bottom = getInsets().getBottom();
        double contentWidth = (width - left - right)/zoomFactor.get();
        double contentHeight = (height - top - bottom)/zoomFactory;
        layoutInArea(content, left, top,
                contentWidth, contentHeight,
                0, null,
                pos.getHpos(),
                pos.getVpos());
    }

    public final Double getZoomFactor() {
        return zoomFactor.get();
    }
    public final void setZoomFactor(Double zoomFactor) {
        this.zoomFactor.set(zoomFactor);
    }
    public final void setZoomFactors(Double zoomFactorx, Double Zoomfactory) {
        this.zoomFactory = Zoomfactory;
        this.zoomFactor.set(zoomFactorx);
    }

    public final DoubleProperty zoomFactorProperty() {
        return zoomFactor;
    }
}

}

I am getting the following error.

Exception in thread "JavaFX Application Thread" netscape.javascript.JSException: ReferenceError: Can't find variable: addNum
at com.sun.webkit.dom.JSObject.fwkMakeException(JSObject.java:128)
at com.sun.webkit.WebPage.twkExecuteScript(Native Method)
at com.sun.webkit.WebPage.executeScript(WebPage.java:1439)
at javafx.scene.web.WebEngine.executeScript(WebEngine.java:982)
at c.WebScale.createScene(WebScale.java:97)
at c.WebScale.access$0(WebScale.java:83)
at c.WebScale$2.run(WebScale.java:78)
at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)

Where is addNum() defined? Can you share the code for it?

Amber
– Amber

2015-10-20 14:25:36 +00:00
Commented Oct 20, 2015 at 14:25 — Amber
– Amber, Commented Oct 20, 2015 at 14:25

Amber · Accepted Answer · 2015-10-20 14:39:56Z

3

Assuming addNum() is defined in Main.html, the javascript hasn't been loaded at the time that you're calling it. You should add a listener so you can call your javascript once the page is fully loaded:

    final WebEngine engine = webView.getEngine();
    engine.getLoadWorker().stateProperty().addListener(
            new ChangeListener<State>() {
                public void changed(ObservableValue ov, State oldState, State newState) {
                    if (newState == State.SUCCEEDED) {
                        engine.executeScript("addNum()");
                    }
                }
            });

    engine.load(strpath);

answered Oct 20, 2015 at 14:39

Amber

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