Argthtjtr

Question

How can I pass parameters to a secondary window in javafx? Is there a way to communicate with the corresponding controller?

For example:
The user chooses a customer from a TableView and a new window is opened, showing the customer's info.

Stage newStage = new Stage();

try 

{

    AnchorPane page = (AnchorPane) FXMLLoader.load(HectorGestion.class.getResource(fxmlResource));

    Scene scene = new Scene(page);

    newStage.setScene(scene);

    newStage.setTitle(windowTitle);

    newStage.setResizable(isResizable);

    if(showRightAway) 

    {

        newStage.show();

    }

}

newStage would be the new window. The problem is, I can't find a way to tell the controller where to look for the customer's info (by passing the id as parameter).

Any ideas?

Check to see if this works too: stackoverflow.com/questions/14370183/… — Jan 21 '13 at 4:32
@Alvaro: did you get your solution? can you pass parameter? from one controller to another controller file? — Mar 7 '14 at 4:47
Yes. jewelsea gave a book-level explanation. That's why I accepted his answer — Mar 7 '14 at 12:40

score 226 · Accepted Answer · 2018-01-11 23:18:21Z

Recommended Approach

This answer enumerates different mechanisms for passing parameters to FXML controllers.

For small applications I highly recommend passing parameters directly from the caller to the controller - it's simple, straightforward and requires no extra frameworks.

For larger, more complicated applications, it would be worthwhile investigating if you want to use Dependency Injection or Event Bus mechanisms within your application.

Passing Parameters Directly From the Caller to the Controller

Pass custom data to an FXML controller by retrieving the controller from the FXML loader instance and calling a method on the controller to initialize it with the required data values.

Something like the following code:

public Stage showCustomerDialog(Customer customer) {

  FXMLLoader loader = new FXMLLoader(

    getClass().getResource(

      "customerDialog.fxml"

    )

  );



  Stage stage = new Stage(StageStyle.DECORATED);

  stage.setScene(

    new Scene(

      (Pane) loader.load()

    )

  );



  CustomerDialogController controller = 

    loader.<CustomerDialogController>getController();

  controller.initData(customer);



  stage.show();



  return stage;

}



...



class CustomerDialogController {

  @FXML private Label customerName;

  void initialize() {}

  void initData(Customer customer) {

    customerName.setText(customer.getName());

  }

}

A new FXMLLoader is constructed as shown in the sample code i.e. new FXMLLoader(location). The location is a URL and you can generate such a URL from an FXML resource by:

new FXMLLoader(getClass().getResource("sample.fxml"));

Be careful NOT to use a static load function on the FXMLLoader, or you will not be able to get your controller from your loader instance.

FXMLLoader instances themselves never know anything about domain objects. You do not directly pass application specific domain objects into the FXMLLoader constructor, instead you:

Construct an FXMLLoader based upon fxml markup at a specified location

Get a controller from the FXMLLoader instance.

Invoke methods on the retrieved controller to provide the controller with references to the domain objects.

This blog (by another writer) provides an alternate, but similar, example.

Setting a Controller on the FXMLLoader

CustomerDialogController dialogController = 

    new CustomerDialogController(param1, param2);



FXMLLoader loader = new FXMLLoader(

    getClass().getResource(

        "customerDialog.fxml"

    )

);

loader.setController(dialogController);



Pane mainPane = (Pane) loader.load();

You can construct a new controller in code, passing any parameters you want from your caller into the controller constructor. Once you have constructed a controller, you can set it on an FXMLLoader instance before you invoke the load() instance method.

To set a controller on a loader (in JavaFX 2.x) you CANNOT also define a fx:controller attribute in your fxml file.

Due to the limitation on the fx:controller definition in FXML, I personally prefer getting the controller from the FXMLLoader rather than setting the controller into the FXMLLoader.

Having the Controller Retrieve Parameters from an External Static Method

This method is exemplified by Sergey's answer to Javafx 2.0 How-to Application.getParameters() in a Controller.java file.

Use Dependency Injection

FXMLLoader supports dependency injection systems like Guice, Spring or Java EE CDI by allowing you to set a custom controller factory on the FXMLLoader. This provides a callback that you can use to create the controller instance with dependent values injected by the respective dependency injection system. There is a sample of integrating FXML with the Spring dependency injection system (unfortunately the link is dead and the content is gone, if anybody knows of a similar example, please edit this question to reference it), though it's a bit clunkier than it would be using the new custom controller factory features made available in JavaFX 2.2.

A really nice, clean dependency injection approach is exemplified by the afterburner.fx framework with a sample air-hacks application that uses it. afterburner.fx relies on JEE6 javax.inject to perform the dependency injection.

Use an Event Bus

Greg Brown, the original FXML specification creator and implementor, often suggests considering use of an event bus for communication between FXML instantiated controllers and other application logic.

The EventBus is a simple but powerful publish/subscribe API with annotations that allows POJOs to communicate with each other anywhere in a JVM without having to refer to each other.

Follow-up Q&A

on first method, why do you return Stage? The method can be void as well because you already giving the command show(); just before return stage;. How do you plan usage by returning the Stage

It is a functional solution to a problem. A stage is returned from the showCustomerDialog function so that a reference to it can be stored by an external class which may wish to do something, such as hide the stage based on a button click in the main window, at a later time. An alternate, object-oriented solution could encapsulate the functionality and stage reference inside a CustomerDialog object or have a CustomerDialog extend Stage. A full example for an object-oriented interface to a custom dialog encapsulating FXML, controller and model data is beyond the scope of this answer, but may make a worthwhile blog post for anybody inclined to create one.

Additional information supplied by StackOverflow user named @dzim

Example for Spring Boot Dependency Injection

The question of how to do it "The Spring Boot Way", there was a discussion about JavaFX 2, which I anserwered in the attached permalink.
The approach is still valid and tested in March 2016, on Spring Boot v1.3.3.RELEASE:
https://stackoverflow.com/a/36310391/1281217

Sometimes, you might want to pass results back to the caller, in which case you can check out the answer to the related question:

JavaFX FXML Parameter passing from Controller A to B and back

the event bus website alluded to states, "Update 3/2013: The EventBus has gone stale..." — Dec 6 '13 at 3:41
The DataFX Controller Frameworks provides some injection support for FXML controllers: guigarage.com/2013/12/datafx-controller-framework-preview — Mar 5 '14 at 14:11
+1 for the "Be careful NOT to use a static load function" Thank you so much jewelsea, you are great! — May 22 '15 at 2:31
Added additional Q&A section to answer to address the further questions of @Anarkie — Dec 29 '15 at 19:24
for godshake is there anything simple for doing this tiny work in JavaFx? its a very common feature to pass data in constructor and javafx requires this hell of things all together just to send one name or one value? — Apr 24 '17 at 7:43

Alexander Kirov 3,28511322 · Answer 2 · 2013-01-07 00:02:20Z

javafx.scene.Node class has a pair of methods
setUserData(Object)
and
Object getUserData()

Which you could use to add your info to the Node.

So, you can call page.setUserData(info);

And controller can check, if info is set. Also, you could use ObjectProperty for back-forward data transfering, if needed.

Observe a documentation here:
http://docs.oracle.com/javafx/2/api/javafx/fxml/doc-files/introduction_to_fxml.html
Before the phrase "In the first version, the handleButtonAction() is tagged with @FXML to allow markup defined in the controller's document to invoke it. In the second example, the button field is annotated to allow the loader to set its value. The initialize() method is similarly annotated."

So, you need to associate a controller with a node, and set a user data to the node.

Stage.getScene() -> Scene.getRoot() -> recursive search with Parent.getChildrenUnmodifiable(). This is very dirty way. If somebody could suggest smth better - that will be great. — Jan 7 '13 at 1:57
It seems Stage.getScene().getRoot() is the correct way! Thanks — Jan 7 '13 at 2:10

user1503636 7314 · Answer 3 · 2016-01-12 04:05:07Z

Here is an example for passing parameters to a fxml document through namespace.

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Label?>

<?import javafx.scene.layout.BorderPane?>

<?import javafx.scene.layout.VBox?>

<VBox xmlns="http://javafx.com/javafx/null" xmlns:fx="http://javafx.com/fxml/1">

    <BorderPane>

        <center>

            <Label text="$labelText"/>

        </center>

    </BorderPane>

</VBox>

Define value External Text for namespace variable labelText:

import javafx.application.Application;

import javafx.fxml.FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.stage.Stage;



import java.io.IOException;



public class NamespaceParameterExampleApplication extends Application {



    public static void main(String args) {

        launch(args);

    }



    @Override

    public void start(Stage primaryStage) throws IOException {

        final FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("namespace-parameter-example.fxml"));



        fxmlLoader.getNamespace()

                  .put("labelText", "External Text");



        final Parent root = fxmlLoader.load();



        primaryStage.setTitle("Namespace Parameter Example");

        primaryStage.setScene(new Scene(root, 400, 400));

        primaryStage.show();

    }

}

It should be noted that some keys are used internally: e.g. FXMLLoader.CONTROLLER_KEYWORD, FXMLLoader.LOCATION_KEY, FXMLLoader.RESOURCES_KEY and any string used as value for the fx:id attribute. — Feb 1 '16 at 22:55
Thank for this, my other scene is just a container that shows the text previously shown on my main scene. Now I can have one fxml that I can reuse in multiple places by initialiszing content via Namepace variables. I didnt' have to create any new methods or alter my constructor or initalisers - just addd variable in my FXML and add one line into my fxmloader code in the main controller. — Oct 28 at 21:35

score 6 · Answer 4 · 2018-06-26 20:20:45Z

I realize this is a very old post and has some great answers already,
but I wanted to make a simple MCVE to demonstrate one such approach and allow new coders a way to quickly see the concept in action.

In this example, we will use 5 files:

Main.java - Simply used to start the application and call the first controller.

Controller1.java - The controller for the first FXML layout.

Controller2.java - The controller for the second FXML layout.

Layout1.fxml - The FXML layout for the first scene.

Layout2.fxml - The FXML layout for the second scene.

All files are listed in their entirety at the bottom of this post.

The Goal: To demonstrate passing values from Controller1 to Controller2 and vice versa.

The Program Flow:

The first scene contains a TextField, a Button, and a Label. When the Button is clicked, the second window is loaded and displayed, including the text entered in the TextField.

Within the second scene, there is also a TextField, a Button, and a Label. The Label will display the text entered in the TextField on the first scene.

Upon entering text in the second scene's TextField and clicking its Button, the first scene's Label is updated to show the entered text.

This is a very simple demonstration and could surely stand for some improvement, but should make the concept very clear.

The code itself is also commented with some details of what is happening and how.

THE CODE

Main.java:

import javafx.application.Application;

import javafx.stage.Stage;



public class Main extends Application {



    public static void main(String args) {

        launch(args);

    }



    @Override

    public void start(Stage primaryStage) {



        // Create the first controller, which loads Layout1.fxml within its own constructor

        Controller1 controller1 = new Controller1();



        // Show the new stage

        controller1.showStage();



    }

}

Controller1.java:

import javafx.fxml.FXML;

import javafx.fxml.FXMLLoader;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.Label;

import javafx.scene.control.TextField;

import javafx.stage.Stage;



import java.io.IOException;



public class Controller1 {



    // Holds this controller's Stage

    private final Stage thisStage;



    // Define the nodes from the Layout1.fxml file. This allows them to be referenced within the controller

    @FXML

    private TextField txtToSecondController;

    @FXML

    private Button btnOpenLayout2;

    @FXML

    private Label lblFromController2;



    public Controller1() {



        // Create the new stage

        thisStage = new Stage();



        // Load the FXML file

        try {

            FXMLLoader loader = new FXMLLoader(getClass().getResource("Layout1.fxml"));



            // Set this class as the controller

            loader.setController(this);



            // Load the scene

            thisStage.setScene(new Scene(loader.load()));



            // Setup the window/stage

            thisStage.setTitle("Passing Controllers Example - Layout1");



        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    /**

     * Show the stage that was loaded in the constructor

     */

    public void showStage() {

        thisStage.showAndWait();

    }



    /**

     * The initialize() method allows you set setup your scene, adding actions, configuring nodes, etc.

     */

    @FXML

    private void initialize() {



        // Add an action for the "Open Layout2" button

        btnOpenLayout2.setOnAction(event -> openLayout2());

    }



    /**

     * Performs the action of loading and showing Layout2

     */

    private void openLayout2() {



        // Create the second controller, which loads its own FXML file. We pass a reference to this controller

        // using the keyword [this]; that allows the second controller to access the methods contained in here.

        Controller2 controller2 = new Controller2(this);



        // Show the new stage/window

        controller2.showStage();



    }



    /**

     * Returns the text entered into txtToSecondController. This allows other controllers/classes to view that data.

     */

    public String getEnteredText() {

        return txtToSecondController.getText();

    }



    /**

     * Allows other controllers to set the text of this layout's Label

     */

    public void setTextFromController2(String text) {

        lblFromController2.setText(text);

    }

}

Controller2.java:

import javafx.fxml.FXML;

import javafx.fxml.FXMLLoader;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.Label;

import javafx.scene.control.TextField;

import javafx.stage.Stage;



import java.io.IOException;



public class Controller2 {



    // Holds this controller's Stage

    private Stage thisStage;



    // Will hold a reference to the first controller, allowing us to access the methods found there.

    private final Controller1 controller1;



    // Add references to the controls in Layout2.fxml

    @FXML

    private Label lblFromController1;

    @FXML

    private TextField txtToFirstController;

    @FXML

    private Button btnSetLayout1Text;



    public Controller2(Controller1 controller1) {

        // We received the first controller, now let's make it usable throughout this controller.

        this.controller1 = controller1;



        // Create the new stage

        thisStage = new Stage();



        // Load the FXML file

        try {

            FXMLLoader loader = new FXMLLoader(getClass().getResource("Layout2.fxml"));



            // Set this class as the controller

            loader.setController(this);



            // Load the scene

            thisStage.setScene(new Scene(loader.load()));



            // Setup the window/stage

            thisStage.setTitle("Passing Controllers Example - Layout2");



        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    /**

     * Show the stage that was loaded in the constructor

     */

    public void showStage() {

        thisStage.showAndWait();

    }



    @FXML

    private void initialize() {



        // Set the label to whatever the text entered on Layout1 is

        lblFromController1.setText(controller1.getEnteredText());



        // Set the action for the button

        btnSetLayout1Text.setOnAction(event -> setTextOnLayout1());

    }



    /**

     * Calls the "setTextFromController2()" method on the first controller to update its Label

     */

    private void setTextOnLayout1() {

        controller1.setTextFromController2(txtToFirstController.getText());

    }



}

Layout1.fxml:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>

<?import javafx.scene.control.*?>

<?import javafx.scene.layout.AnchorPane?>

<?import javafx.scene.layout.HBox?>

<?import javafx.scene.layout.VBox?>

<AnchorPane xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1">

    <VBox alignment="CENTER" spacing="10.0">

        <padding>

            <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>

        </padding>

        <Label style="-fx-font-weight: bold;" text="This is Layout1!"/>

        <HBox alignment="CENTER_LEFT" spacing="10.0">

            <Label text="Enter Text:"/>

            <TextField fx:id="txtToSecondController"/>

            <Button fx:id="btnOpenLayout2" mnemonicParsing="false" text="Open Layout2"/>

        </HBox>

        <VBox alignment="CENTER">

            <Label text="Text From Controller2:"/>

            <Label fx:id="lblFromController2" text="Nothing Yet!"/>

        </VBox>

    </VBox>

</AnchorPane>

Layout2.fxml:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>

<?import javafx.scene.control.*?>

<?import javafx.scene.layout.AnchorPane?>

<?import javafx.scene.layout.HBox?>

<?import javafx.scene.layout.VBox?>

<AnchorPane xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1">

    <VBox alignment="CENTER" spacing="10.0">

        <padding>

            <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>

        </padding>

        <Label style="-fx-font-weight: bold;" text="Welcome to Layout 2!"/>

        <VBox alignment="CENTER">

            <Label text="Text From Controller1:"/>

            <Label fx:id="lblFromController1" text="Nothing Yet!"/>

        </VBox>

        <HBox alignment="CENTER_LEFT" spacing="10.0">

            <Label text="Enter Text:"/>

            <TextField fx:id="txtToFirstController"/>

            <Button fx:id="btnSetLayout1Text" mnemonicParsing="false" text="Set Text on Layout1"/>

        </HBox>

    </VBox>

</AnchorPane>

Is it possible to set the controller in the FXML file? Beause removing the line: loader.setController(this) and adding the controller in the FXML file crashes the application — Oct 20 at 10:15
Not if the FXML is loaded from within the controller itself. If you load the FXML from the Main class, for example, you can define the controller in the FXML file and get a reference to it using loader.getController() — Oct 20 at 12:52

diego matos - keke 1,175108 · Answer 5 · 2016-04-28 22:25:12Z

This WORKS ..

Remember first time you print the passing value you will get null,
You can use it after your windows loaded , same for everything you want to code for any other component.

First Controller

try {

                                Stage st = new Stage();

                                 FXMLLoader loader = new FXMLLoader(getClass().getResource("/com/inty360/free/form/MainOnline.fxml"));



                                Parent sceneMain = loader.load();



                                MainOnlineController controller = loader.<MainOnlineController>getController();

                                controller.initVariable(99L);



                                Scene scene = new Scene(sceneMain);

                                st.setScene(scene);

                                st.setMaximized(true);

                                st.setTitle("My App");

                                st.show();

                            } catch (IOException ex) {

                                Logger.getLogger(LoginController.class.getName()).log(Level.SEVERE, null, ex);

                            }

Another Controller

public void initVariable(Long id_usuario){

        this.id_usuario = id_usuario;

        label_usuario_nombre.setText(id_usuario.toString());



    }

This work when you pass parameter from first controller to second but how to pass parameter from second to first controller,i mean after first.fxml was loaded. — Sep 18 '17 at 23:15
@XlintXms see the related question JavaFX FXML Parameter passing from Controller A to B and back, which addresses your additional question. — Jan 11 at 23:13

CTN 17717 · Answer 6 · 2016-10-22 14:14:44Z

You have to create one Context Class.

public class Context {

    private final static Context instance = new Context();

    public static Context getInstance() {

        return instance;

    }



    private Connection con;

    public void setConnection(Connection con)

    {

        this.con=con;

    }

    public Connection getConnection() {

        return con;

    }



    private TabRoughController tabRough;

    public void setTabRough(TabRoughController tabRough) {

        this.tabRough=tabRough;

    }



    public TabRoughController getTabRough() {

        return tabRough;

    }

}

You have to just set instance of controller in initialization using

Context.getInstance().setTabRough(this);

and you can use it from your whole application just using

TabRoughController cont=Context.getInstance().getTabRough();

Now you can pass parameter to any controller from whole application.

jenglert 869820 · Answer 7 · 2015-11-20 00:48:45Z

Here is an example for using a controller injected by Guice.

/**

 * Loads a FXML file and injects its controller from the given Guice {@code Provider}

 */

public abstract class GuiceFxmlLoader {



   public GuiceFxmlLoader(Stage stage, Provider<?> provider) {

      mStage = Objects.requireNonNull(stage);

      mProvider = Objects.requireNonNull(provider);

   }



   /**

    * @return the FXML file name

    */

   public abstract String getFileName();



   /**

    * Load FXML, set its controller with given {@code Provider}, and add it to {@code Stage}.

    */

   public void loadView() {

      try {

         FXMLLoader loader = new FXMLLoader(getClass().getClassLoader().getResource(getFileName()));

         loader.setControllerFactory(p -> mProvider.get());

         Node view = loader.load();

         setViewInStage(view);

      }

      catch (IOException ex) {

         LOGGER.error("Failed to load FXML: " + getFileName(), ex);

      }

   }



   private void setViewInStage(Node view) {

      BorderPane pane = (BorderPane)mStage.getScene().getRoot();

      pane.setCenter(view);

   }



   private static final Logger LOGGER = Logger.getLogger(GuiceFxmlLoader.class);



   private final Stage mStage;

   private final Provider<?> mProvider;

}

Here is a concrete implementation of the loader:

public class ConcreteViewLoader extends GuiceFxmlLoader {



   @Inject

   public ConcreteViewLoader(Stage stage, Provider<MyController> provider) {

      super(stage, provider);

   }



   @Override

   public String getFileName() {

      return "my_view.fxml";

   }

}

Note this example loads the view into the center of a BoarderPane that is the root of the Scene in the Stage. This is irrelevant to the example (implementation detail of my specific use case) but decided to leave it in as some may find it useful.

Nospaniol Noah 92 · Answer 8 · 2018-03-15 12:29:43Z

up vote
0
down vote

You can decide to use a public observable list to store public data, or just create a public setter method to store data and retrieve from the corresponding controller

answered Mar 15 at 12:29

Nospaniol Noah

92

add a comment |

score 226 · Accepted Answer · 2018-01-11 23:18:21Z

Recommended Approach

This answer enumerates different mechanisms for passing parameters to FXML controllers.

For small applications I highly recommend passing parameters directly from the caller to the controller - it's simple, straightforward and requires no extra frameworks.

For larger, more complicated applications, it would be worthwhile investigating if you want to use Dependency Injection or Event Bus mechanisms within your application.

Passing Parameters Directly From the Caller to the Controller

Pass custom data to an FXML controller by retrieving the controller from the FXML loader instance and calling a method on the controller to initialize it with the required data values.

Something like the following code:

public Stage showCustomerDialog(Customer customer) {

  FXMLLoader loader = new FXMLLoader(

    getClass().getResource(

      "customerDialog.fxml"

    )

  );



  Stage stage = new Stage(StageStyle.DECORATED);

  stage.setScene(

    new Scene(

      (Pane) loader.load()

    )

  );



  CustomerDialogController controller = 

    loader.<CustomerDialogController>getController();

  controller.initData(customer);



  stage.show();



  return stage;

}



...



class CustomerDialogController {

  @FXML private Label customerName;

  void initialize() {}

  void initData(Customer customer) {

    customerName.setText(customer.getName());

  }

}

A new FXMLLoader is constructed as shown in the sample code i.e. new FXMLLoader(location). The location is a URL and you can generate such a URL from an FXML resource by:

new FXMLLoader(getClass().getResource("sample.fxml"));

Be careful NOT to use a static load function on the FXMLLoader, or you will not be able to get your controller from your loader instance.

FXMLLoader instances themselves never know anything about domain objects. You do not directly pass application specific domain objects into the FXMLLoader constructor, instead you:

Construct an FXMLLoader based upon fxml markup at a specified location

Get a controller from the FXMLLoader instance.

Invoke methods on the retrieved controller to provide the controller with references to the domain objects.

This blog (by another writer) provides an alternate, but similar, example.

Setting a Controller on the FXMLLoader

CustomerDialogController dialogController = 

    new CustomerDialogController(param1, param2);



FXMLLoader loader = new FXMLLoader(

    getClass().getResource(

        "customerDialog.fxml"

    )

);

loader.setController(dialogController);



Pane mainPane = (Pane) loader.load();

You can construct a new controller in code, passing any parameters you want from your caller into the controller constructor. Once you have constructed a controller, you can set it on an FXMLLoader instance before you invoke the load() instance method.

To set a controller on a loader (in JavaFX 2.x) you CANNOT also define a fx:controller attribute in your fxml file.

Due to the limitation on the fx:controller definition in FXML, I personally prefer getting the controller from the FXMLLoader rather than setting the controller into the FXMLLoader.

Having the Controller Retrieve Parameters from an External Static Method

This method is exemplified by Sergey's answer to Javafx 2.0 How-to Application.getParameters() in a Controller.java file.

Use Dependency Injection

FXMLLoader supports dependency injection systems like Guice, Spring or Java EE CDI by allowing you to set a custom controller factory on the FXMLLoader. This provides a callback that you can use to create the controller instance with dependent values injected by the respective dependency injection system. There is a sample of integrating FXML with the Spring dependency injection system (unfortunately the link is dead and the content is gone, if anybody knows of a similar example, please edit this question to reference it), though it's a bit clunkier than it would be using the new custom controller factory features made available in JavaFX 2.2.

A really nice, clean dependency injection approach is exemplified by the afterburner.fx framework with a sample air-hacks application that uses it. afterburner.fx relies on JEE6 javax.inject to perform the dependency injection.

Use an Event Bus

Greg Brown, the original FXML specification creator and implementor, often suggests considering use of an event bus for communication between FXML instantiated controllers and other application logic.

The EventBus is a simple but powerful publish/subscribe API with annotations that allows POJOs to communicate with each other anywhere in a JVM without having to refer to each other.

Follow-up Q&A

on first method, why do you return Stage? The method can be void as well because you already giving the command show(); just before return stage;. How do you plan usage by returning the Stage

It is a functional solution to a problem. A stage is returned from the showCustomerDialog function so that a reference to it can be stored by an external class which may wish to do something, such as hide the stage based on a button click in the main window, at a later time. An alternate, object-oriented solution could encapsulate the functionality and stage reference inside a CustomerDialog object or have a CustomerDialog extend Stage. A full example for an object-oriented interface to a custom dialog encapsulating FXML, controller and model data is beyond the scope of this answer, but may make a worthwhile blog post for anybody inclined to create one.

Additional information supplied by StackOverflow user named @dzim

Example for Spring Boot Dependency Injection

The question of how to do it "The Spring Boot Way", there was a discussion about JavaFX 2, which I anserwered in the attached permalink.
The approach is still valid and tested in March 2016, on Spring Boot v1.3.3.RELEASE:
https://stackoverflow.com/a/36310391/1281217

Sometimes, you might want to pass results back to the caller, in which case you can check out the answer to the related question:

JavaFX FXML Parameter passing from Controller A to B and back

the event bus website alluded to states, "Update 3/2013: The EventBus has gone stale..." — Dec 6 '13 at 3:41
The DataFX Controller Frameworks provides some injection support for FXML controllers: guigarage.com/2013/12/datafx-controller-framework-preview — Mar 5 '14 at 14:11
+1 for the "Be careful NOT to use a static load function" Thank you so much jewelsea, you are great! — May 22 '15 at 2:31
Added additional Q&A section to answer to address the further questions of @Anarkie — Dec 29 '15 at 19:24
for godshake is there anything simple for doing this tiny work in JavaFx? its a very common feature to pass data in constructor and javafx requires this hell of things all together just to send one name or one value? — Apr 24 '17 at 7:43

Alexander Kirov 3,28511322 · Answer 10 · 2013-01-07 00:02:20Z

javafx.scene.Node class has a pair of methods
setUserData(Object)
and
Object getUserData()

Which you could use to add your info to the Node.

So, you can call page.setUserData(info);

And controller can check, if info is set. Also, you could use ObjectProperty for back-forward data transfering, if needed.

Observe a documentation here:
http://docs.oracle.com/javafx/2/api/javafx/fxml/doc-files/introduction_to_fxml.html
Before the phrase "In the first version, the handleButtonAction() is tagged with @FXML to allow markup defined in the controller's document to invoke it. In the second example, the button field is annotated to allow the loader to set its value. The initialize() method is similarly annotated."

So, you need to associate a controller with a node, and set a user data to the node.

Stage.getScene() -> Scene.getRoot() -> recursive search with Parent.getChildrenUnmodifiable(). This is very dirty way. If somebody could suggest smth better - that will be great. — Jan 7 '13 at 1:57
It seems Stage.getScene().getRoot() is the correct way! Thanks — Jan 7 '13 at 2:10

user1503636 7314 · Answer 11 · 2016-01-12 04:05:07Z

Here is an example for passing parameters to a fxml document through namespace.

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Label?>

<?import javafx.scene.layout.BorderPane?>

<?import javafx.scene.layout.VBox?>

<VBox xmlns="http://javafx.com/javafx/null" xmlns:fx="http://javafx.com/fxml/1">

    <BorderPane>

        <center>

            <Label text="$labelText"/>

        </center>

    </BorderPane>

</VBox>

Define value External Text for namespace variable labelText:

import javafx.application.Application;

import javafx.fxml.FXMLLoader;

import javafx.scene.Parent;

import javafx.scene.Scene;

import javafx.stage.Stage;



import java.io.IOException;



public class NamespaceParameterExampleApplication extends Application {



    public static void main(String args) {

        launch(args);

    }



    @Override

    public void start(Stage primaryStage) throws IOException {

        final FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("namespace-parameter-example.fxml"));



        fxmlLoader.getNamespace()

                  .put("labelText", "External Text");



        final Parent root = fxmlLoader.load();



        primaryStage.setTitle("Namespace Parameter Example");

        primaryStage.setScene(new Scene(root, 400, 400));

        primaryStage.show();

    }

}

It should be noted that some keys are used internally: e.g. FXMLLoader.CONTROLLER_KEYWORD, FXMLLoader.LOCATION_KEY, FXMLLoader.RESOURCES_KEY and any string used as value for the fx:id attribute. — Feb 1 '16 at 22:55
Thank for this, my other scene is just a container that shows the text previously shown on my main scene. Now I can have one fxml that I can reuse in multiple places by initialiszing content via Namepace variables. I didnt' have to create any new methods or alter my constructor or initalisers - just addd variable in my FXML and add one line into my fxmloader code in the main controller. — Oct 28 at 21:35

score 6 · Answer 12 · 2018-06-26 20:20:45Z

I realize this is a very old post and has some great answers already,
but I wanted to make a simple MCVE to demonstrate one such approach and allow new coders a way to quickly see the concept in action.

In this example, we will use 5 files:

Main.java - Simply used to start the application and call the first controller.

Controller1.java - The controller for the first FXML layout.

Controller2.java - The controller for the second FXML layout.

Layout1.fxml - The FXML layout for the first scene.

Layout2.fxml - The FXML layout for the second scene.

All files are listed in their entirety at the bottom of this post.

The Goal: To demonstrate passing values from Controller1 to Controller2 and vice versa.

The Program Flow:

The first scene contains a TextField, a Button, and a Label. When the Button is clicked, the second window is loaded and displayed, including the text entered in the TextField.

Within the second scene, there is also a TextField, a Button, and a Label. The Label will display the text entered in the TextField on the first scene.

Upon entering text in the second scene's TextField and clicking its Button, the first scene's Label is updated to show the entered text.

This is a very simple demonstration and could surely stand for some improvement, but should make the concept very clear.

The code itself is also commented with some details of what is happening and how.

THE CODE

Main.java:

import javafx.application.Application;

import javafx.stage.Stage;



public class Main extends Application {



    public static void main(String args) {

        launch(args);

    }



    @Override

    public void start(Stage primaryStage) {



        // Create the first controller, which loads Layout1.fxml within its own constructor

        Controller1 controller1 = new Controller1();



        // Show the new stage

        controller1.showStage();



    }

}

Controller1.java:

import javafx.fxml.FXML;

import javafx.fxml.FXMLLoader;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.Label;

import javafx.scene.control.TextField;

import javafx.stage.Stage;



import java.io.IOException;



public class Controller1 {



    // Holds this controller's Stage

    private final Stage thisStage;



    // Define the nodes from the Layout1.fxml file. This allows them to be referenced within the controller

    @FXML

    private TextField txtToSecondController;

    @FXML

    private Button btnOpenLayout2;

    @FXML

    private Label lblFromController2;



    public Controller1() {



        // Create the new stage

        thisStage = new Stage();



        // Load the FXML file

        try {

            FXMLLoader loader = new FXMLLoader(getClass().getResource("Layout1.fxml"));



            // Set this class as the controller

            loader.setController(this);



            // Load the scene

            thisStage.setScene(new Scene(loader.load()));



            // Setup the window/stage

            thisStage.setTitle("Passing Controllers Example - Layout1");



        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    /**

     * Show the stage that was loaded in the constructor

     */

    public void showStage() {

        thisStage.showAndWait();

    }



    /**

     * The initialize() method allows you set setup your scene, adding actions, configuring nodes, etc.

     */

    @FXML

    private void initialize() {



        // Add an action for the "Open Layout2" button

        btnOpenLayout2.setOnAction(event -> openLayout2());

    }



    /**

     * Performs the action of loading and showing Layout2

     */

    private void openLayout2() {



        // Create the second controller, which loads its own FXML file. We pass a reference to this controller

        // using the keyword [this]; that allows the second controller to access the methods contained in here.

        Controller2 controller2 = new Controller2(this);



        // Show the new stage/window

        controller2.showStage();



    }



    /**

     * Returns the text entered into txtToSecondController. This allows other controllers/classes to view that data.

     */

    public String getEnteredText() {

        return txtToSecondController.getText();

    }



    /**

     * Allows other controllers to set the text of this layout's Label

     */

    public void setTextFromController2(String text) {

        lblFromController2.setText(text);

    }

}

Controller2.java:

import javafx.fxml.FXML;

import javafx.fxml.FXMLLoader;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.Label;

import javafx.scene.control.TextField;

import javafx.stage.Stage;



import java.io.IOException;



public class Controller2 {



    // Holds this controller's Stage

    private Stage thisStage;



    // Will hold a reference to the first controller, allowing us to access the methods found there.

    private final Controller1 controller1;



    // Add references to the controls in Layout2.fxml

    @FXML

    private Label lblFromController1;

    @FXML

    private TextField txtToFirstController;

    @FXML

    private Button btnSetLayout1Text;



    public Controller2(Controller1 controller1) {

        // We received the first controller, now let's make it usable throughout this controller.

        this.controller1 = controller1;



        // Create the new stage

        thisStage = new Stage();



        // Load the FXML file

        try {

            FXMLLoader loader = new FXMLLoader(getClass().getResource("Layout2.fxml"));



            // Set this class as the controller

            loader.setController(this);



            // Load the scene

            thisStage.setScene(new Scene(loader.load()));



            // Setup the window/stage

            thisStage.setTitle("Passing Controllers Example - Layout2");



        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    /**

     * Show the stage that was loaded in the constructor

     */

    public void showStage() {

        thisStage.showAndWait();

    }



    @FXML

    private void initialize() {



        // Set the label to whatever the text entered on Layout1 is

        lblFromController1.setText(controller1.getEnteredText());



        // Set the action for the button

        btnSetLayout1Text.setOnAction(event -> setTextOnLayout1());

    }



    /**

     * Calls the "setTextFromController2()" method on the first controller to update its Label

     */

    private void setTextOnLayout1() {

        controller1.setTextFromController2(txtToFirstController.getText());

    }



}

Layout1.fxml:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>

<?import javafx.scene.control.*?>

<?import javafx.scene.layout.AnchorPane?>

<?import javafx.scene.layout.HBox?>

<?import javafx.scene.layout.VBox?>

<AnchorPane xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1">

    <VBox alignment="CENTER" spacing="10.0">

        <padding>

            <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>

        </padding>

        <Label style="-fx-font-weight: bold;" text="This is Layout1!"/>

        <HBox alignment="CENTER_LEFT" spacing="10.0">

            <Label text="Enter Text:"/>

            <TextField fx:id="txtToSecondController"/>

            <Button fx:id="btnOpenLayout2" mnemonicParsing="false" text="Open Layout2"/>

        </HBox>

        <VBox alignment="CENTER">

            <Label text="Text From Controller2:"/>

            <Label fx:id="lblFromController2" text="Nothing Yet!"/>

        </VBox>

    </VBox>

</AnchorPane>

Layout2.fxml:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>

<?import javafx.scene.control.*?>

<?import javafx.scene.layout.AnchorPane?>

<?import javafx.scene.layout.HBox?>

<?import javafx.scene.layout.VBox?>

<AnchorPane xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1">

    <VBox alignment="CENTER" spacing="10.0">

        <padding>

            <Insets bottom="10.0" left="10.0" right="10.0" top="10.0"/>

        </padding>

        <Label style="-fx-font-weight: bold;" text="Welcome to Layout 2!"/>

        <VBox alignment="CENTER">

            <Label text="Text From Controller1:"/>

            <Label fx:id="lblFromController1" text="Nothing Yet!"/>

        </VBox>

        <HBox alignment="CENTER_LEFT" spacing="10.0">

            <Label text="Enter Text:"/>

            <TextField fx:id="txtToFirstController"/>

            <Button fx:id="btnSetLayout1Text" mnemonicParsing="false" text="Set Text on Layout1"/>

        </HBox>

    </VBox>

</AnchorPane>

Is it possible to set the controller in the FXML file? Beause removing the line: loader.setController(this) and adding the controller in the FXML file crashes the application — Oct 20 at 10:15
Not if the FXML is loaded from within the controller itself. If you load the FXML from the Main class, for example, you can define the controller in the FXML file and get a reference to it using loader.getController() — Oct 20 at 12:52

diego matos - keke 1,175108 · Answer 13 · 2016-04-28 22:25:12Z

This WORKS ..

Remember first time you print the passing value you will get null,
You can use it after your windows loaded , same for everything you want to code for any other component.

First Controller

try {

                                Stage st = new Stage();

                                 FXMLLoader loader = new FXMLLoader(getClass().getResource("/com/inty360/free/form/MainOnline.fxml"));



                                Parent sceneMain = loader.load();



                                MainOnlineController controller = loader.<MainOnlineController>getController();

                                controller.initVariable(99L);



                                Scene scene = new Scene(sceneMain);

                                st.setScene(scene);

                                st.setMaximized(true);

                                st.setTitle("My App");

                                st.show();

                            } catch (IOException ex) {

                                Logger.getLogger(LoginController.class.getName()).log(Level.SEVERE, null, ex);

                            }

Another Controller

public void initVariable(Long id_usuario){

        this.id_usuario = id_usuario;

        label_usuario_nombre.setText(id_usuario.toString());



    }

This work when you pass parameter from first controller to second but how to pass parameter from second to first controller,i mean after first.fxml was loaded. — Sep 18 '17 at 23:15
@XlintXms see the related question JavaFX FXML Parameter passing from Controller A to B and back, which addresses your additional question. — Jan 11 at 23:13

CTN 17717 · Answer 14 · 2016-10-22 14:14:44Z

You have to create one Context Class.

public class Context {

    private final static Context instance = new Context();

    public static Context getInstance() {

        return instance;

    }



    private Connection con;

    public void setConnection(Connection con)

    {

        this.con=con;

    }

    public Connection getConnection() {

        return con;

    }



    private TabRoughController tabRough;

    public void setTabRough(TabRoughController tabRough) {

        this.tabRough=tabRough;

    }



    public TabRoughController getTabRough() {

        return tabRough;

    }

}

You have to just set instance of controller in initialization using

Context.getInstance().setTabRough(this);

and you can use it from your whole application just using

TabRoughController cont=Context.getInstance().getTabRough();

Now you can pass parameter to any controller from whole application.

jenglert 869820 · Answer 15 · 2015-11-20 00:48:45Z

Here is an example for using a controller injected by Guice.

/**

 * Loads a FXML file and injects its controller from the given Guice {@code Provider}

 */

public abstract class GuiceFxmlLoader {



   public GuiceFxmlLoader(Stage stage, Provider<?> provider) {

      mStage = Objects.requireNonNull(stage);

      mProvider = Objects.requireNonNull(provider);

   }



   /**

    * @return the FXML file name

    */

   public abstract String getFileName();



   /**

    * Load FXML, set its controller with given {@code Provider}, and add it to {@code Stage}.

    */

   public void loadView() {

      try {

         FXMLLoader loader = new FXMLLoader(getClass().getClassLoader().getResource(getFileName()));

         loader.setControllerFactory(p -> mProvider.get());

         Node view = loader.load();

         setViewInStage(view);

      }

      catch (IOException ex) {

         LOGGER.error("Failed to load FXML: " + getFileName(), ex);

      }

   }



   private void setViewInStage(Node view) {

      BorderPane pane = (BorderPane)mStage.getScene().getRoot();

      pane.setCenter(view);

   }



   private static final Logger LOGGER = Logger.getLogger(GuiceFxmlLoader.class);



   private final Stage mStage;

   private final Provider<?> mProvider;

}

Here is a concrete implementation of the loader:

public class ConcreteViewLoader extends GuiceFxmlLoader {



   @Inject

   public ConcreteViewLoader(Stage stage, Provider<MyController> provider) {

      super(stage, provider);

   }



   @Override

   public String getFileName() {

      return "my_view.fxml";

   }

}

Note this example loads the view into the center of a BoarderPane that is the root of the Scene in the Stage. This is irrelevant to the example (implementation detail of my specific use case) but decided to leave it in as some may find it useful.

Nospaniol Noah 92 · Answer 16 · 2018-03-15 12:29:43Z

up vote
0
down vote

You can decide to use a public observable list to store public data, or just create a public setter method to store data and retrieve from the corresponding controller

answered Mar 15 at 12:29

Nospaniol Noah

92

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