Examples of netscape.javascript.JSObject

netscape.javascript.JSObject
JSObject allows Java to manipulate objects that are defined in JavaScript. Values passed from Java to JavaScript are converted as follows:
- JSObject is converted to the original JavaScript object
- Any other Java object is converted to a JavaScript wrapper, which can be used to access methods and fields of the java object. Converting this wrapper to a string will call the toString method on the original object, converting to a number will call the doubleValue method if possible and fail otherwise. Converting to a boolean will try to call the booleanValue method in the same way.
- Java arrays are wrapped with a JavaScript object that understands array.length and array[index]
- A Java boolean is converted to a JavaScript boolean
- Java byte, char, short, int, long, float, and double are converted to JavaScript numbers
Values passed from JavaScript to Java are converted as follows:
- objects which are wrappers around java objects are unwrapped
- other objects are wrapped with a JSObject
- strings, numbers and booleans are converted to String, Double, and Boolean objects respectively
This means that all JavaScript values show up as some kind of java.lang.Object in Java. In order to make much use of them, you will have to cast them to the appropriate subclass of Object, e.g. (String) window.getMember("name"); or (JSObject) window.getMember("document");.

      new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          try {
            URL location = new URL(urlField.getText());
            System.out.println("going to URL: " + location);
            JSObject window = JSObject.getWindow(TrivialApplet.this);
            if (window != null) {
              //window.eval("alert('going to location " + location + "');");
              window.eval("println('" + location + "')");
            }
            getAppletContext().showDocument(location, "_new");
          } catch (MalformedURLException mfue) {
          }
        }

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      showStatus("See you later!");
    return true;
    }
    
  public void print(String message) {
    JSObject window = JSObject.getWindow(this);
    Object[] args = { message };
    window.call("println", args);
    }

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  public void saveText(String text, String fileNameProposal)
      throws UnsupportedEncodingException {
    if (webWrapper.getContainer() instanceof Applet) {
      System.out.println(text);
      JSObject jsRoot = webWrapper.getJsRoot();
      JSObject window = (JSObject) jsRoot.getMember("window");
      String dataUri = "data:text/plain;charset=utf-8,"
          + URLEncoder.encode(text, "UTF-8").replace("+", "%20");
      Object[] params = new Object[] { dataUri, "_blank" };
      window.call("open", params);
    } else {
      JFileChooser fc = new JFileChooser();
      fc.setSelectedFile(new File(fileNameProposal));
      if (fc.showSaveDialog(webWrapper.getContainer()) == JFileChooser.APPROVE_OPTION) {
        File file = fc.getSelectedFile();

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  public Location(Visualizer webWrapper) {
    this.webWrapper = webWrapper;
  }


  private JSObject getJSLocation() {
    JSObject jsRoot = webWrapper.getJsRoot();
    if (jsRoot != null) {
      JSObject document = (JSObject) jsRoot.getMember("document");
      return (JSObject) document.getMember("location");
    }
    return null;
  }

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    }
    return null;
  }


  public String getHref() {
    JSObject jsLoc = getJSLocation();
    if (jsLoc == null) {
      return "";
    }
    return jsLoc.getMember("href").toString();
  }

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    }
    return jsLoc.getMember("href").toString();
  }


  public void setHref(String href) {
    JSObject jsLoc = getJSLocation();
    if (jsLoc == null)
      try {
        Desktop.getDesktop().browse(URI.create(href));
      } catch (Exception e) {
        e.printStackTrace();
      }
    else
      jsLoc.setMember("href", href);
  }

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    return "This applet simulates a JavaScript web environment to run an aichallenge visualizer.";
  }


  public void run() {
    try {
      final JSObject jsRoot = JSObject.getWindow(this);
      webWrapper = new Visualizer(this, getWidth(), getHeight(), false);
      webWrapper.setJsRoot(jsRoot);
      HTMLDocument document = webWrapper.getDomWindow().getDocument();
      ScriptableObject options = webWrapper.construct("Options", null);
      Object config = null;

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     *  is defined in all tests.  Parse the testcases array, and create a new
     *  TestCase object for each TestCase object it finds.
     */
    public synchronized boolean parseResult() {
        try {
           JSObject testcases = (JSObject) window.getMember("testcases");
            file.totalCases = ((Number) ((JSObject) testcases).getMember("length")).intValue();
            System.out.println( "testcases.length is " + file.totalCases );
            for ( int i = 0; i < file.totalCases; i++ ) {
                JSObject tc  = (JSObject) ((JSObject) testcases).getSlot(i);


                TestCase nc = new TestCase(
                    tc.getMember("passed") == null ? "null" : tc.getMember("passed").toString(),
                    tc.getMember("name") == null ? "null " : tc.getMember("name").toString(),
                    tc.getMember("description") == null ? "null " : tc.getMember("description").toString(),
                    tc.getMember("expect") == null ? "null " : tc.getMember("expect").toString(),
                    tc.getMember("actual") == null ? "null " : tc.getMember("actual").toString(),
                    tc.getMember("reason") == null ? "null " : tc.getMember("reason").toString()
                );


                file.caseVector.addElement( nc );


                if ( nc.passed.equals("false") ) {

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    public ExampleApplet3() throws HeadlessException {
        super();
    }


    public void paint(Graphics g) {
        JSObject window = JSObject.getWindow(this);
        JSObject document = (JSObject) window.getMember("document");
        JSObject location = (JSObject) document.getMember("location");
        
        g.drawString("Title: " + document.getMember("title"), 10, 20);
        g.drawString("URL: " + location.getMember("href"), 10, 40);
        
        window.eval("getMessageFromApplet(\"Hello from the Java applet!\")");
        
    }

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      repaint();
    }
  }


  public void executeJS(short[] pcmData) {
    JSObject j = JSObject.getWindow(this);
    j.call("passAudio", new Object[] {pcmData});
  }

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