Alert and Confirm handlers for a JavaFX WebView hosted in a Swing application.

AlertAndConfirmHandlers.java

engine.setOnAlert(new EventHandler<WebEvent<String>>() {
	@Override 
	public void handle(WebEvent<String> event) {
		JOptionPane.showMessageDialog(
			myPanel,
			event.getData(),
                    	"Alert Message",
                    	OptionPane.ERROR_MESSAGE);
	}
});
                
engine.setConfirmHandler(new Callback<String, Boolean>() {
	@Override public Boolean call(String msg) {         		
		int result = JOptionPane.showConfirmDialog(
                                    myPanel,
                                    msg,
                                    PLANT + "Confirm Message",
                                    JOptionPane.OK_CANCEL_OPTION);

		return result == 0 ? true : false;
    	}
});