JavaFX 2.0 + FXML. Updating scene values from a different Task

Question

I want to get the controller from a scene that i've loaded with FXMLoader. The use case is:

1. My JSON manager receives a JSON object

2. The task I've launched shows a new Scene using

   Parent p = FXMLLoader.load(getClass().getResource("foo.fxml"));
   Scene scene = new Scene(p);
   stage.setScene(scene);
   

   After that, i have the empty scene.

3. Now I do this to fill the components

   AnchorPane pane = (AnchorPane)((AnchorPane) scene.getRoot()).getChildren().get(0);
   for(Node node : pane.getChildren()){
       String id = node.getId();
       if(id.equals(NAME)){
            ((TextField)node).setText(value);
       }
   }
   

My question, is there an easier way to do this? I have a controller specified in FXML

<AnchorPane id="AnchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="526.0" minWidth="356.0" prefHeight="526.0" prefWidth="356.0" 
xmlns:fx="http://javafx.com/fxml" fx:controller="bar.foo">

I want to get the instance with the bind values (TextField called name in this case)

Thanks in advance

Solution

1) You can get the controller from the FXMLLoader but don't know is it possible from Scene :

FXMLLoader fxmlLoader = new FXMLLoader();
Pane p = fxmlLoader.load(getClass().getResource("foo.fxml").openStream());
bar.foo fooController = (bar.foo) fxmlLoader.getController();

To use the fooController later in a different part of your code, you can use Node#setUserData(). For example after the code above:

p.setUserData(fooController);
...
// after a while of app logic and code
bar.foo controller_of_p = (bar.foo) p.getUserData();

This gives a workaround and a shortcut to achieve your goal.

2) If your node has an id then you can directly Node#lookup() it rather than constructing a for-loop :

TextField txt = (TextField) pane.lookup("#nodeId");

Comments

[Javier]

Thanks for your answer, it was a point using node.lookup. The way you show to get the controller doesn't works for me because I need the current controller instance. This way creates a new controller and a new pane.

[Sergey Grinev]

why? Use this code instead of FXMLLoader.load(getClass().getResource("foo.fxml")); and you will get the same pane as in your code.

[Uluk Biy]

@Javier. Updated the answer. Please have a look.

[Javier]

That's exactly what I'm looking for Uluk Bly, thanks!. @Sergey: If you use loader.getResource(...) different times, each time the controller instance will be different.

[Sergey Grinev]

@Javier, i've looked into history and nobody suggested doing that. But nvm as you got your problem solved. :)