Calling DOM objects using Java's ScriptEngine or WebEngine classes

Question

Is it possible to modify html elements using the ScriptEngine or WebEngine classes from Java? I've tried the following:

/* theSite is a WebEngine object. Assume the id 'Email' is correct */
Element email=(Element) theSite.executeScript("document.getElementById('Email');");
email.setAttribute( "value", "navon.josh" );

I saw something like this in an example, but it didn't seem to work. I also tried this:

final ScriptEngineManager manager = new ScriptEngineManager();
final ScriptEngine engine = manager.getEngineByName( "js" );
try {
    engine.eval( "document.getElementById( 'Email' ).value = 'navon.josh'" );
} catch( ScriptException e) {
    e.printStackTrace();
}

This also didn't work. Is it because the statement isn't linked to the WebEngine?

score 2 · Accepted Answer · answered Jun 29 '12 at 18:20

To access DOM model of html loaded into JavaFX 2 WebView you can use WebEngine API. E.g. here is an example of adding listener to HTML TextArea:

WebEngine webEngine = webView.getEngine();
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>");

When I try to test the code, I get an error that says, "The type ChangeListener is not generic; it cannot be parameterized with arguments ". Could that be a problem with my version of Java? — Disco Globeulon, Jun 29 '12 at 18:53
This is an import problem in your program not a version problem with Java. Import `javafx.concurrent.Worker.State` rather than `Thread.State`. — jewelsea, Jun 29 '12 at 20:32

score -2 · Answer 2 · answered Jun 29 '12 at 15:47

-2

No. The DOM is part of a browser and you don't have a browser.

answered Jun 29 '12 at 15:47

Michael Lorton

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So then there's no way to call HTML elements from the WebView? – Disco Globeulon Jun 29 '12 at 15:51
If we're talking Android WebView, no, I couldn't find one. You can do the opposite, though, and supply a Java object to Javascript in the page. – Michael Lorton Jun 29 '12 at 16:05
Oh sorry, I should have been more specific. This has nothing to do with Android. – Disco Globeulon Jun 29 '12 at 16:18
JavaFX 2 WebView is absolutely capable of providing DOM access. – Sergey Grinev Jun 29 '12 at 18:21

Calling DOM objects using Java's ScriptEngine or WebEngine classes

2 Answers2

Linked