Detecting event textkeya HTML textkeya in JavaFX WebView

If you are trying to print the contents of a JavaFX TextArea into a WebView, you must add listeners to TextArea, not to WebView.

If you are trying to listen to an event in the HTML TextArea tag inside an HTML page in a WebView, you must add listeners to the document model:

// we need this to wait till document load
webEngine.getLoadWorker().stateProperty().addListener(new ChangeListener<State>() {
    public void changed(ObservableValue ov, State oldState, State newState) {
        if (newState == Worker.State.SUCCEEDED) {

            // note next classes are from org.w3c.dom domain
            EventListener listener = new EventListener() {
                public void handleEvent(Event ev) {
                    System.out.println(ev.getType());
                }
            };

            Document doc = webEngine.getDocument();
            Element el = doc.getElementById("textarea");
            ((EventTarget) el).addEventListener("keypress", listener, false);
        }
    }
});
webEngine.loadContent("<textarea id='textarea'></textarea>");