Related
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?
Using MVC
Most of this answer focuses on a direct call to pass a parameter from a calling class to the controller.
If instead, you want to decouple the caller and controller and use a more general architecture involving a model class with settable and listenable properties to achieve inter-controller communication, see the following basic overview:
Applying MVC With JavaFx
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(loader.load())
);
CustomerDialogController controller = loader.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 = 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.
An example of JavaFX application and controller dependency injection with Spring is provided in the answer to:
Adding Spring Dependency Injection in JavaFX (JPA Repo, Service)
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, such as the Guava EventBus, 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
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>
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();
}
}
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.
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());
}
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.
Yes you can.
You need to add in the first controller:
YourController controller = loader.getController();
controller.setclient(client);
Then in the second one declare a client, then at the bottom of your controller:
public void setclien(Client c) {
this.client = c;
}
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.
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
Why answer a 6 year old question ?
One the most fundamental concepts working with any programming language is how to navigate from one (window, form or page) to another. Also while doing this navigation the developer often wants to pass data from one (window, form or page) and display or use the data passed
While most of the answers here provide good to excellent examples how to accomplish this we thought we would kick it up a notch or two or three
We said three because we will navigate between three (window, form or page) and use the concept of static variables to pass data around the (window, form or page)
We will also include some decision making code while we navigate
public class Start extends Application {
#Override
public void start(Stage stage) throws Exception {
// This is MAIN Class which runs first
Parent root = FXMLLoader.load(getClass().getResource("start.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setResizable(false);// This sets the value for all stages
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
}
public static void main(String[] args) {
launch(args);
}
}
Start Controller
public class startController implements Initializable {
#FXML Pane startPane,pageonePane;
#FXML Button btnPageOne;
#FXML TextField txtStartValue;
public Stage stage;
public static int intSETonStartController;
String strSETonStartController;
#FXML
private void toPageOne() throws IOException{
strSETonStartController = txtStartValue.getText().trim();
// yourString != null && yourString.trim().length() > 0
// int L = testText.length();
// if(L == 0){
// System.out.println("LENGTH IS "+L);
// return;
// }
/* if (testText.matches("[1-2]") && !testText.matches("^\\s*$"))
Second Match is regex for White Space NOT TESTED !
*/
String testText = txtStartValue.getText().trim();
// NOTICE IF YOU REMOVE THE * CHARACTER FROM "[1-2]*"
// NO NEED TO CHECK LENGTH it also permited 12 or 11 as valid entry
// =================================================================
if (testText.matches("[1-2]")) {
intSETonStartController = Integer.parseInt(strSETonStartController);
}else{
txtStartValue.setText("Enter 1 OR 2");
return;
}
System.out.println("You Entered = "+intSETonStartController);
stage = (Stage)startPane.getScene().getWindow();// pane you are ON
pageonePane = FXMLLoader.load(getClass().getResource("pageone.fxml"));// pane you are GOING TO
Scene scene = new Scene(pageonePane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Page One");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
private void doGET(){
// Why this testing ?
// strSENTbackFROMPageoneController is null because it is set on Pageone
// =====================================================================
txtStartValue.setText(strSENTbackFROMPageoneController);
if(intSETonStartController == 1){
txtStartValue.setText(str);
}
System.out.println("== doGET WAS RUN ==");
if(txtStartValue.getText() == null){
txtStartValue.setText("");
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
// This Method runs every time startController is LOADED
doGET();
}
}
Page One Controller
public class PageoneController implements Initializable {
#FXML Pane startPane,pageonePane,pagetwoPane;
#FXML Button btnOne,btnTwo;
#FXML TextField txtPageOneValue;
public static String strSENTbackFROMPageoneController;
public Stage stage;
#FXML
private void onBTNONE() throws IOException{
stage = (Stage)pageonePane.getScene().getWindow();// pane you are ON
pagetwoPane = FXMLLoader.load(getClass().getResource("pagetwo.fxml"));// pane you are GOING TO
Scene scene = new Scene(pagetwoPane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Page Two");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
#FXML
private void onBTNTWO() throws IOException{
if(intSETonStartController == 2){
Alert alert = new Alert(AlertType.CONFIRMATION);
alert.setTitle("Alert");
alert.setHeaderText("YES to change Text Sent Back");
alert.setResizable(false);
alert.setContentText("Select YES to send 'Alert YES Pressed' Text Back\n"
+ "\nSelect CANCEL send no Text Back\r");// NOTE this is a Carriage return\r
ButtonType buttonTypeYes = new ButtonType("YES");
ButtonType buttonTypeCancel = new ButtonType("CANCEL", ButtonData.CANCEL_CLOSE);
alert.getButtonTypes().setAll(buttonTypeYes, buttonTypeCancel);
Optional<ButtonType> result = alert.showAndWait();
if (result.get() == buttonTypeYes){
txtPageOneValue.setText("Alert YES Pressed");
} else {
System.out.println("canceled");
txtPageOneValue.setText("");
onBack();// Optional
}
}
}
#FXML
private void onBack() throws IOException{
strSENTbackFROMPageoneController = txtPageOneValue.getText();
System.out.println("Text Returned = "+strSENTbackFROMPageoneController);
stage = (Stage)pageonePane.getScene().getWindow();
startPane = FXMLLoader.load(getClass().getResource("start.fxml"));
Scene scene = new Scene(startPane);
stage.setScene(scene);
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
private void doTEST(){
String fromSTART = String.valueOf(intSETonStartController);
txtPageOneValue.setText("SENT "+fromSTART);
if(intSETonStartController == 1){
btnOne.setVisible(true);
btnTwo.setVisible(false);
System.out.println("INTEGER Value Entered = "+intSETonStartController);
}else{
btnOne.setVisible(false);
btnTwo.setVisible(true);
System.out.println("INTEGER Value Entered = "+intSETonStartController);
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
doTEST();
}
}
Page Two Controller
public class PagetwoController implements Initializable {
#FXML Pane startPane,pagetwoPane;
public Stage stage;
public static String str;
#FXML
private void toStart() throws IOException{
str = "You ON Page Two";
stage = (Stage)pagetwoPane.getScene().getWindow();// pane you are ON
startPane = FXMLLoader.load(getClass().getResource("start.fxml"));// pane you are GOING TO
Scene scene = new Scene(startPane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
#Override
public void initialize(URL url, ResourceBundle rb) {
}
}
Below are all the FXML files
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="pagetwoPane" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.PagetwoController">
<children>
<Button layoutX="227.0" layoutY="62.0" mnemonicParsing="false" onAction="#toStart" text="To Start Page">
<font>
<Font name="System Bold" size="18.0" />
</font>
</Button>
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="startPane" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.startController">
<children>
<Label focusTraversable="false" layoutX="115.0" layoutY="47.0" text="This is the Start Pane">
<font>
<Font size="18.0" />
</font>
</Label>
<Button fx:id="btnPageOne" focusTraversable="false" layoutX="137.0" layoutY="100.0" mnemonicParsing="false" onAction="#toPageOne" text="To Page One">
<font>
<Font size="18.0" />
</font>
</Button>
<Label focusTraversable="false" layoutX="26.0" layoutY="150.0" text="Enter 1 OR 2">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="txtStartValue" layoutX="137.0" layoutY="148.0" prefHeight="28.0" prefWidth="150.0" />
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="pageonePane" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.PageoneController">
<children>
<Label focusTraversable="false" layoutX="111.0" layoutY="35.0" text="This is Page One Pane">
<font>
<Font size="18.0" />
</font>
</Label>
<Button focusTraversable="false" layoutX="167.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBack" text="BACK">
<font>
<Font size="18.0" />
</font></Button>
<Button fx:id="btnOne" focusTraversable="false" layoutX="19.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBTNONE" text="Button One" visible="false">
<font>
<Font size="18.0" />
</font>
</Button>
<Button fx:id="btnTwo" focusTraversable="false" layoutX="267.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBTNTWO" text="Button Two">
<font>
<Font size="18.0" />
</font>
</Button>
<Label focusTraversable="false" layoutX="19.0" layoutY="152.0" text="Send Anything BACK">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="txtPageOneValue" layoutX="195.0" layoutY="150.0" prefHeight="28.0" prefWidth="150.0" />
</children>
</AnchorPane>
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?
Using MVC
Most of this answer focuses on a direct call to pass a parameter from a calling class to the controller.
If instead, you want to decouple the caller and controller and use a more general architecture involving a model class with settable and listenable properties to achieve inter-controller communication, see the following basic overview:
Applying MVC With JavaFx
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(loader.load())
);
CustomerDialogController controller = loader.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 = 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.
An example of JavaFX application and controller dependency injection with Spring is provided in the answer to:
Adding Spring Dependency Injection in JavaFX (JPA Repo, Service)
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, such as the Guava EventBus, 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
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>
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();
}
}
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.
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());
}
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.
Yes you can.
You need to add in the first controller:
YourController controller = loader.getController();
controller.setclient(client);
Then in the second one declare a client, then at the bottom of your controller:
public void setclien(Client c) {
this.client = c;
}
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.
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
Why answer a 6 year old question ?
One the most fundamental concepts working with any programming language is how to navigate from one (window, form or page) to another. Also while doing this navigation the developer often wants to pass data from one (window, form or page) and display or use the data passed
While most of the answers here provide good to excellent examples how to accomplish this we thought we would kick it up a notch or two or three
We said three because we will navigate between three (window, form or page) and use the concept of static variables to pass data around the (window, form or page)
We will also include some decision making code while we navigate
public class Start extends Application {
#Override
public void start(Stage stage) throws Exception {
// This is MAIN Class which runs first
Parent root = FXMLLoader.load(getClass().getResource("start.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setResizable(false);// This sets the value for all stages
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
}
public static void main(String[] args) {
launch(args);
}
}
Start Controller
public class startController implements Initializable {
#FXML Pane startPane,pageonePane;
#FXML Button btnPageOne;
#FXML TextField txtStartValue;
public Stage stage;
public static int intSETonStartController;
String strSETonStartController;
#FXML
private void toPageOne() throws IOException{
strSETonStartController = txtStartValue.getText().trim();
// yourString != null && yourString.trim().length() > 0
// int L = testText.length();
// if(L == 0){
// System.out.println("LENGTH IS "+L);
// return;
// }
/* if (testText.matches("[1-2]") && !testText.matches("^\\s*$"))
Second Match is regex for White Space NOT TESTED !
*/
String testText = txtStartValue.getText().trim();
// NOTICE IF YOU REMOVE THE * CHARACTER FROM "[1-2]*"
// NO NEED TO CHECK LENGTH it also permited 12 or 11 as valid entry
// =================================================================
if (testText.matches("[1-2]")) {
intSETonStartController = Integer.parseInt(strSETonStartController);
}else{
txtStartValue.setText("Enter 1 OR 2");
return;
}
System.out.println("You Entered = "+intSETonStartController);
stage = (Stage)startPane.getScene().getWindow();// pane you are ON
pageonePane = FXMLLoader.load(getClass().getResource("pageone.fxml"));// pane you are GOING TO
Scene scene = new Scene(pageonePane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Page One");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
private void doGET(){
// Why this testing ?
// strSENTbackFROMPageoneController is null because it is set on Pageone
// =====================================================================
txtStartValue.setText(strSENTbackFROMPageoneController);
if(intSETonStartController == 1){
txtStartValue.setText(str);
}
System.out.println("== doGET WAS RUN ==");
if(txtStartValue.getText() == null){
txtStartValue.setText("");
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
// This Method runs every time startController is LOADED
doGET();
}
}
Page One Controller
public class PageoneController implements Initializable {
#FXML Pane startPane,pageonePane,pagetwoPane;
#FXML Button btnOne,btnTwo;
#FXML TextField txtPageOneValue;
public static String strSENTbackFROMPageoneController;
public Stage stage;
#FXML
private void onBTNONE() throws IOException{
stage = (Stage)pageonePane.getScene().getWindow();// pane you are ON
pagetwoPane = FXMLLoader.load(getClass().getResource("pagetwo.fxml"));// pane you are GOING TO
Scene scene = new Scene(pagetwoPane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Page Two");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
#FXML
private void onBTNTWO() throws IOException{
if(intSETonStartController == 2){
Alert alert = new Alert(AlertType.CONFIRMATION);
alert.setTitle("Alert");
alert.setHeaderText("YES to change Text Sent Back");
alert.setResizable(false);
alert.setContentText("Select YES to send 'Alert YES Pressed' Text Back\n"
+ "\nSelect CANCEL send no Text Back\r");// NOTE this is a Carriage return\r
ButtonType buttonTypeYes = new ButtonType("YES");
ButtonType buttonTypeCancel = new ButtonType("CANCEL", ButtonData.CANCEL_CLOSE);
alert.getButtonTypes().setAll(buttonTypeYes, buttonTypeCancel);
Optional<ButtonType> result = alert.showAndWait();
if (result.get() == buttonTypeYes){
txtPageOneValue.setText("Alert YES Pressed");
} else {
System.out.println("canceled");
txtPageOneValue.setText("");
onBack();// Optional
}
}
}
#FXML
private void onBack() throws IOException{
strSENTbackFROMPageoneController = txtPageOneValue.getText();
System.out.println("Text Returned = "+strSENTbackFROMPageoneController);
stage = (Stage)pageonePane.getScene().getWindow();
startPane = FXMLLoader.load(getClass().getResource("start.fxml"));
Scene scene = new Scene(startPane);
stage.setScene(scene);
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
private void doTEST(){
String fromSTART = String.valueOf(intSETonStartController);
txtPageOneValue.setText("SENT "+fromSTART);
if(intSETonStartController == 1){
btnOne.setVisible(true);
btnTwo.setVisible(false);
System.out.println("INTEGER Value Entered = "+intSETonStartController);
}else{
btnOne.setVisible(false);
btnTwo.setVisible(true);
System.out.println("INTEGER Value Entered = "+intSETonStartController);
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
doTEST();
}
}
Page Two Controller
public class PagetwoController implements Initializable {
#FXML Pane startPane,pagetwoPane;
public Stage stage;
public static String str;
#FXML
private void toStart() throws IOException{
str = "You ON Page Two";
stage = (Stage)pagetwoPane.getScene().getWindow();// pane you are ON
startPane = FXMLLoader.load(getClass().getResource("start.fxml"));// pane you are GOING TO
Scene scene = new Scene(startPane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
#Override
public void initialize(URL url, ResourceBundle rb) {
}
}
Below are all the FXML files
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="pagetwoPane" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.PagetwoController">
<children>
<Button layoutX="227.0" layoutY="62.0" mnemonicParsing="false" onAction="#toStart" text="To Start Page">
<font>
<Font name="System Bold" size="18.0" />
</font>
</Button>
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="startPane" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.startController">
<children>
<Label focusTraversable="false" layoutX="115.0" layoutY="47.0" text="This is the Start Pane">
<font>
<Font size="18.0" />
</font>
</Label>
<Button fx:id="btnPageOne" focusTraversable="false" layoutX="137.0" layoutY="100.0" mnemonicParsing="false" onAction="#toPageOne" text="To Page One">
<font>
<Font size="18.0" />
</font>
</Button>
<Label focusTraversable="false" layoutX="26.0" layoutY="150.0" text="Enter 1 OR 2">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="txtStartValue" layoutX="137.0" layoutY="148.0" prefHeight="28.0" prefWidth="150.0" />
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="pageonePane" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.PageoneController">
<children>
<Label focusTraversable="false" layoutX="111.0" layoutY="35.0" text="This is Page One Pane">
<font>
<Font size="18.0" />
</font>
</Label>
<Button focusTraversable="false" layoutX="167.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBack" text="BACK">
<font>
<Font size="18.0" />
</font></Button>
<Button fx:id="btnOne" focusTraversable="false" layoutX="19.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBTNONE" text="Button One" visible="false">
<font>
<Font size="18.0" />
</font>
</Button>
<Button fx:id="btnTwo" focusTraversable="false" layoutX="267.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBTNTWO" text="Button Two">
<font>
<Font size="18.0" />
</font>
</Button>
<Label focusTraversable="false" layoutX="19.0" layoutY="152.0" text="Send Anything BACK">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="txtPageOneValue" layoutX="195.0" layoutY="150.0" prefHeight="28.0" prefWidth="150.0" />
</children>
</AnchorPane>
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?
Using MVC
Most of this answer focuses on a direct call to pass a parameter from a calling class to the controller.
If instead, you want to decouple the caller and controller and use a more general architecture involving a model class with settable and listenable properties to achieve inter-controller communication, see the following basic overview:
Applying MVC With JavaFx
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(loader.load())
);
CustomerDialogController controller = loader.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 = 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.
An example of JavaFX application and controller dependency injection with Spring is provided in the answer to:
Adding Spring Dependency Injection in JavaFX (JPA Repo, Service)
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, such as the Guava EventBus, 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
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>
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();
}
}
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.
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());
}
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.
Yes you can.
You need to add in the first controller:
YourController controller = loader.getController();
controller.setclient(client);
Then in the second one declare a client, then at the bottom of your controller:
public void setclien(Client c) {
this.client = c;
}
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.
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
Why answer a 6 year old question ?
One the most fundamental concepts working with any programming language is how to navigate from one (window, form or page) to another. Also while doing this navigation the developer often wants to pass data from one (window, form or page) and display or use the data passed
While most of the answers here provide good to excellent examples how to accomplish this we thought we would kick it up a notch or two or three
We said three because we will navigate between three (window, form or page) and use the concept of static variables to pass data around the (window, form or page)
We will also include some decision making code while we navigate
public class Start extends Application {
#Override
public void start(Stage stage) throws Exception {
// This is MAIN Class which runs first
Parent root = FXMLLoader.load(getClass().getResource("start.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setResizable(false);// This sets the value for all stages
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
}
public static void main(String[] args) {
launch(args);
}
}
Start Controller
public class startController implements Initializable {
#FXML Pane startPane,pageonePane;
#FXML Button btnPageOne;
#FXML TextField txtStartValue;
public Stage stage;
public static int intSETonStartController;
String strSETonStartController;
#FXML
private void toPageOne() throws IOException{
strSETonStartController = txtStartValue.getText().trim();
// yourString != null && yourString.trim().length() > 0
// int L = testText.length();
// if(L == 0){
// System.out.println("LENGTH IS "+L);
// return;
// }
/* if (testText.matches("[1-2]") && !testText.matches("^\\s*$"))
Second Match is regex for White Space NOT TESTED !
*/
String testText = txtStartValue.getText().trim();
// NOTICE IF YOU REMOVE THE * CHARACTER FROM "[1-2]*"
// NO NEED TO CHECK LENGTH it also permited 12 or 11 as valid entry
// =================================================================
if (testText.matches("[1-2]")) {
intSETonStartController = Integer.parseInt(strSETonStartController);
}else{
txtStartValue.setText("Enter 1 OR 2");
return;
}
System.out.println("You Entered = "+intSETonStartController);
stage = (Stage)startPane.getScene().getWindow();// pane you are ON
pageonePane = FXMLLoader.load(getClass().getResource("pageone.fxml"));// pane you are GOING TO
Scene scene = new Scene(pageonePane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Page One");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
private void doGET(){
// Why this testing ?
// strSENTbackFROMPageoneController is null because it is set on Pageone
// =====================================================================
txtStartValue.setText(strSENTbackFROMPageoneController);
if(intSETonStartController == 1){
txtStartValue.setText(str);
}
System.out.println("== doGET WAS RUN ==");
if(txtStartValue.getText() == null){
txtStartValue.setText("");
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
// This Method runs every time startController is LOADED
doGET();
}
}
Page One Controller
public class PageoneController implements Initializable {
#FXML Pane startPane,pageonePane,pagetwoPane;
#FXML Button btnOne,btnTwo;
#FXML TextField txtPageOneValue;
public static String strSENTbackFROMPageoneController;
public Stage stage;
#FXML
private void onBTNONE() throws IOException{
stage = (Stage)pageonePane.getScene().getWindow();// pane you are ON
pagetwoPane = FXMLLoader.load(getClass().getResource("pagetwo.fxml"));// pane you are GOING TO
Scene scene = new Scene(pagetwoPane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Page Two");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
#FXML
private void onBTNTWO() throws IOException{
if(intSETonStartController == 2){
Alert alert = new Alert(AlertType.CONFIRMATION);
alert.setTitle("Alert");
alert.setHeaderText("YES to change Text Sent Back");
alert.setResizable(false);
alert.setContentText("Select YES to send 'Alert YES Pressed' Text Back\n"
+ "\nSelect CANCEL send no Text Back\r");// NOTE this is a Carriage return\r
ButtonType buttonTypeYes = new ButtonType("YES");
ButtonType buttonTypeCancel = new ButtonType("CANCEL", ButtonData.CANCEL_CLOSE);
alert.getButtonTypes().setAll(buttonTypeYes, buttonTypeCancel);
Optional<ButtonType> result = alert.showAndWait();
if (result.get() == buttonTypeYes){
txtPageOneValue.setText("Alert YES Pressed");
} else {
System.out.println("canceled");
txtPageOneValue.setText("");
onBack();// Optional
}
}
}
#FXML
private void onBack() throws IOException{
strSENTbackFROMPageoneController = txtPageOneValue.getText();
System.out.println("Text Returned = "+strSENTbackFROMPageoneController);
stage = (Stage)pageonePane.getScene().getWindow();
startPane = FXMLLoader.load(getClass().getResource("start.fxml"));
Scene scene = new Scene(startPane);
stage.setScene(scene);
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
private void doTEST(){
String fromSTART = String.valueOf(intSETonStartController);
txtPageOneValue.setText("SENT "+fromSTART);
if(intSETonStartController == 1){
btnOne.setVisible(true);
btnTwo.setVisible(false);
System.out.println("INTEGER Value Entered = "+intSETonStartController);
}else{
btnOne.setVisible(false);
btnTwo.setVisible(true);
System.out.println("INTEGER Value Entered = "+intSETonStartController);
}
}
#Override
public void initialize(URL url, ResourceBundle rb) {
doTEST();
}
}
Page Two Controller
public class PagetwoController implements Initializable {
#FXML Pane startPane,pagetwoPane;
public Stage stage;
public static String str;
#FXML
private void toStart() throws IOException{
str = "You ON Page Two";
stage = (Stage)pagetwoPane.getScene().getWindow();// pane you are ON
startPane = FXMLLoader.load(getClass().getResource("start.fxml"));// pane you are GOING TO
Scene scene = new Scene(startPane);// pane you are GOING TO
stage.setScene(scene);
stage.setTitle("Start Page");
stage.show();
stage.sizeToScene();
stage.centerOnScreen();
}
#Override
public void initialize(URL url, ResourceBundle rb) {
}
}
Below are all the FXML files
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="pagetwoPane" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.PagetwoController">
<children>
<Button layoutX="227.0" layoutY="62.0" mnemonicParsing="false" onAction="#toStart" text="To Start Page">
<font>
<Font name="System Bold" size="18.0" />
</font>
</Button>
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="startPane" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.startController">
<children>
<Label focusTraversable="false" layoutX="115.0" layoutY="47.0" text="This is the Start Pane">
<font>
<Font size="18.0" />
</font>
</Label>
<Button fx:id="btnPageOne" focusTraversable="false" layoutX="137.0" layoutY="100.0" mnemonicParsing="false" onAction="#toPageOne" text="To Page One">
<font>
<Font size="18.0" />
</font>
</Button>
<Label focusTraversable="false" layoutX="26.0" layoutY="150.0" text="Enter 1 OR 2">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="txtStartValue" layoutX="137.0" layoutY="148.0" prefHeight="28.0" prefWidth="150.0" />
</children>
</AnchorPane>
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<AnchorPane id="AnchorPane" fx:id="pageonePane" prefHeight="200.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="atwopage.PageoneController">
<children>
<Label focusTraversable="false" layoutX="111.0" layoutY="35.0" text="This is Page One Pane">
<font>
<Font size="18.0" />
</font>
</Label>
<Button focusTraversable="false" layoutX="167.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBack" text="BACK">
<font>
<Font size="18.0" />
</font></Button>
<Button fx:id="btnOne" focusTraversable="false" layoutX="19.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBTNONE" text="Button One" visible="false">
<font>
<Font size="18.0" />
</font>
</Button>
<Button fx:id="btnTwo" focusTraversable="false" layoutX="267.0" layoutY="97.0" mnemonicParsing="false" onAction="#onBTNTWO" text="Button Two">
<font>
<Font size="18.0" />
</font>
</Button>
<Label focusTraversable="false" layoutX="19.0" layoutY="152.0" text="Send Anything BACK">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="txtPageOneValue" layoutX="195.0" layoutY="150.0" prefHeight="28.0" prefWidth="150.0" />
</children>
</AnchorPane>
I am looking to update text in a textfield based on some value. In order to make this sample simpler I have made my program smaller. The problem seems to be when I put top.setText("This is my new Text");
I looked at this:
how to change the text of TextField in java fx 2
but the answer does not seem to make sense. I don't know why you'd initialize a textfield that has already been implemented. Regardless it did not work.
I have also looked at:
NullPointerException (JavaFX Label.setText())
This seems to be the closest to what I think is the issue, but when I did the following I get an error. Just for clarity this is in the JavaFXApplication5 class.
try {
FXMLLoader loader = new FXMLLoader(
getClass().getResource("FXML.fxml")
);
FXMLLoader.setController(this); // non-static method setController(Object)
// can not be referenced from static context ERROR****
Parent root = (Parent) loader.load();
/*Parent root = FXMLLoader.load(getClass().getResource("FXML.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle("java code");
stage.show();
*/
}
From reading on the internet I wondered if there was a race condition: http://gotoanswer.stanford.edu/nullpointerexception_in_javafx_initialize_method-8807679/
So I tried:
Platform.runLater(new Runnable() {
#Override public void run() {
top.setText("This is my new Text");
}
});
But that did not work. I know that it can be set in Scene Builder but I need a way to dynamically change it based on values from another class. I can figure out how to do that part if I can just figure out how to set it to begin with. Hopefully this explains enough to get some help.
FXMLController Class:
public class FXMLController implements Initializable {
#FXML private TextField top;
public FXMLController() {
System.out.println("Hi");
top.setText("This is my new Text"); // This breaks the program *********
}
#Override
public void initialize(URL url, ResourceBundle rb) {
}
}
FXML.fxml class:
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8" fx:controller="javafxapplication5.FXMLController">
<children>
<TextField fx:id="top" layoutX="171.0" layoutY="68.0" />
</children>
</AnchorPane>
JavaFXApplication5 class: // main class
public class JavaFXApplication5 extends Application {
#Override
public void start(Stage stage) throws Exception {
try {
Parent root = FXMLLoader.load(getClass().getResource("FXML.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle("java code");
stage.show();
}
catch (Exception ex) {
Logger.getLogger(JavaFXApplication5.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String[] args) {
launch(args);
}
}
You can't use a constructor on your controller class (FXMLController), since it will be initilized by the FXMLLoader.
And you are right, the first link has a wrong answer, since the textfield will be initialized (because of the #FXML annotation) in this process.
So for starters, you can add some text to the textfield inside initialize, as it will be loaded from the beginning by the loader, and top will be already instantiated.
public class FXMLController implements Initializable {
#FXML private TextField top;
#Override
public void initialize(URL url, ResourceBundle rb) {
top.setText("This is my first Text");
}
}
Try this first, with your posted version of JavaFXApplication5, and check that works.
There are many ways to set the content on the field, but if you need to modify the text field from another class, just add a public method for that:
public class FXMLController implements Initializable {
#FXML private TextField top;
#Override
public void initialize(URL url, ResourceBundle rb) {
top.setText("This is my new Text");
}
public void setTopText(String text) {
// set text from another class
top.setText(text);
}
}
As an example, you could get an instance of your controller in your main class, and use it to pass the content to the text field, after the stage is shown. This will override the previous content.
#Override
public void start(Stage stage) throws IOException {
FXMLLoader loader = new FXMLLoader(getClass().getResource("FXML.fxml"));
Parent root = loader.load();
FXMLController controller = (FXMLController)loader.getController();
Scene scene = new Scene(root);
stage.setTitle("Java code");
stage.setScene(scene);
stage.show();
controller.setTopText("New Text");
}
I am a novice to javafx. I created a simple javafx fxml application. I defined a treeView in my fxml file. It is as follows,
FXMLDocument.fxml
<AnchorPane id="AnchorPane" prefHeight="200.0" prefWidth="320.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/2.2" fx:controller="scenebuilderfirst.FXMLDocumentController">
<children>
<TreeView id="" fx:id="tree" layoutX="60.0" layoutY="14.0" prefHeight="172.0" prefWidth="200.0" />
</children>
</AnchorPane>
and created the controller class as follows,
FXMLDocumentController.java
public class FXMLDocumentController implements Initializable {
#FXML
private TreeView<?> tree;
#Override
public void initialize(URL url, ResourceBundle rb) {
}
}
my main java file is as follows,
MyApp.java
public class SceneBuilderFirst extends Application {
#Override
public void start(Stage stage) throws Exception {
AnchorPane root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Now I need to add tree items to the TreeView while running the program. So I thought of writing the following peace of code inside the initialize() method of my contorller class,
// creating root item for the tree
TreeItem<String> rootItem = new TreeItem<>("root");
rootItem.setExpanded(true);
//creating childern for the tree
TreeItem<String>item1= new TreeItem<>("content1");
rootItem.getChildren().add(item1);
TreeItem<String>item2= new TreeItem<>("content2");
rootItem.getChildren().add(item2);
//attaching root item to tree
tree = new TreeView<>(rootItem);
But it didn't work.
I need to set the TreeItems while running the program. Not through the fxml file.
So I think I should do the coding in my main java file
I need a way to access my TreeView after loading it via FXMLLoader in my main java file so i can make a TreeView on my own choice and attach it to this TreeView while running the program. Please guide me.
To fix this, replace
tree = new TreeView<>(rootItem);
with
tree.setRoot(rootItem);
For an explanation of why, see this discussion.
You also have to fix your declaration of the TreeView:
#FXML
private TreeView<String> tree;