Question

由于这是我的第一篇文章，请原谅任何不准确之处。我的问题，我想在初始化方法

上将javascript函数的值传递给Javafx

public void initialize(URL arg0, ResourceBundle arg1) {

    // TODO Auto-generated method stub
    final URL urlGoogleMaps = getClass().getResource("googlemaps.html");
    System.out.println("fjdsoij");
    browser.getEngine().load(urlGoogleMaps.toExternalForm());
    WebEngine webEngine = browser.getEngine(); 
    webEngine.getLoadWorker().stateProperty().addListener(
            new ChangeListener<State>(){

                @Override
                public void changed(ObservableValue<? extends State> ov, State oldState, State newState) {
                    if(newState == State.SUCCEEDED){
                        JSObject window = (JSObject)webEngine.executeScript("window");
                        window.setMember("app", new JavaApplication());

                    }
                }
            });
}

public class JavaApplication{
    public void calljavascript( int lengthInMeters){

        System.out.println(lengthInMeters);
    }
}

}

和javascript部分就是这样

   function initialize() {
  var mapOptions = {
    zoom: 3,
    center: new google.maps.LatLng(0, -180),
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  var map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

  var flightPlanCoordinates = [
    new google.maps.LatLng(37.772323, -122.214897),
    new google.maps.LatLng(21.291982, 157.821856)

  ];
  var flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
     //geodesic: true,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2
  });
var lengthInMeters = google.maps.geometry.spherical.computeLength(flightPath.getPath());

  flightPath.setMap(map);
   alert("polyline is "+lengthInMeters+" long");
   app.calljavascript(lengthInMeters);
}

google.maps.event.addDomListener(window, 'load', initialize);

我想传递的值是方法calljavascript上的lengthInMeters有什么想法吗？ thnx提前

Answer 1

我尝试过代码的简化版本：

    WebEngine webEngine = browser.getEngine();

    webEngine.getLoadWorker().stateProperty().addListener((ov,oldState,newState)->{
        if(newState==State.SUCCEEDED){
            JSObject window = (JSObject) webEngine.executeScript("window");
            window.setMember("app", new JavaApplication());
        }
    });
    webView.getEngine().loadContent("<html>\n"
            + " <script>function initialize() {"
            + " var lengthInMeters = 5; " 
            + " app.calljavascript(lengthInMeters);"
            + "} </script> "
            + "    <body onLoad=\"initialize()\">Hi!\n"
            + "    </body>\n"
            + "</html>");

它没有用。

在您的情况下，在我的方法中，{<1}}在网页加载后被称为，因此setMember()在之前被称为 initialize()方法。因此，load失败。

解决方案是：

app.calljavascript()

请注意，我们在加载网页内容之前设置了成员。

修改

我创建了一个更详细的答案here。

从javascript将值传递给JavaFX

1 个答案: