Getting a variable from a FXML to an imported FXML - javafx

Question

I'm currently doing a Java (+ using MySQL) application for my studies : an Database for an Hopital
I code my interface using JavaFX.
I have a Main FXML(for the general view) where I have tabs and in each tab I import another FXML using (fx:include). So that each module of my application has his own Controller and own designed View.
How can pass a variable from the main Controller to the others controllers?
Thanks!
Edit : Let me show you my code
So first there it's the class in which I load my fxml (I have on window of Connexion first and if the informations required for the connexion are ok I load the fxml Main with the main interface) And I set the connexion (THE VARIABLE I NEED TO SEND) that I got from my fxml Connexion to the FXML Main
public class MainApp extends Application {
private Stage primaryStage;
private Connection conn;
MainController controllermain = new MainController();
//ConnexionController controllerconnex;
#Override
public void start(Stage primaryStage) throws Exception {
this.primaryStage = primaryStage;
this.primaryStage.setTitle("BASE DE L'HOPITAL DU ZOB");
showConnexion();
}
public void showConnexion() {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(MainApp.class.getResource("Connexion.fxml"));
Parent page = (AnchorPane) loader.load();
Scene scene = new Scene(page);
primaryStage.setScene(scene);
primaryStage.show();
ConnexionController controller = loader.getController();
controller.setMainApp(this);
} catch (IOException e) {
e.printStackTrace();
}
}
public void showMainApp(Connection conn) {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(MainApp.class.getResource("Main.fxml"));
AnchorPane page = (AnchorPane) loader.load();
Scene scene = new Scene(page);
primaryStage.setScene(scene);
primaryStage.show();
this.conn = conn;
controllermain = loader.getController();
controllermain.setMainApp(this);
controllermain.setConnexion(conn); // I want to send the variable conn to the others
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
Then this is my Main Controller and you can see that I get the variable connexion only with the set method and then I can send it the the other controller
public class MainController implements Initializable {
private MainApp mainApp;
private Button retour;
protected Connection conn;
FXML AchorPane ;
public MainController() {
}
#Override
public void initialize(URL url, ResourceBundle rb) {
}
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
}
public void setConnexion(Connection conn){
this.conn=conn;
}
public void handleRetour(){
mainApp.showConnexion();
}
}
}

Answer 1

You just need a reference to the controller corresponding to the included fxml in the controller corresponding to the "main" fxml. You can do this using the Nested Controllers mechanism.
Briefly, if you have a "main" fxml with a <fx:include> tag, add an fx:id to the <fx:include>:
Main.fxml:
<!-- imports etc -->
<!-- root element, e.g. BorderPane -->
<BorderPane fx:controller="com.example.MainController" xmlns="..." ... >
<!-- ... -->
<fx:include source="tab.fxml" fx:id="tab" />
<!-- ... -->
</BorderPane>
Then in the MainController you can inject the controller from the included fxml using #FXML. The rule is that you append the word "Controller" to the fx:id used in the fx:include. For example, if the controller class for tab.fxml is TabController, given the fx:id is tab, you would do:
public class MainController {
#FXML
private TabController tabController ;
private Connection conn ;
// other injected fields, etc...
public void setConnexion(Connection conn) {
this.conn = conn ;
// pass Connection to TabController:
tabController.setConnexion(conn);
}
}
Now just define a setConnexion(...) method in TabController (if you haven't already) to receive the Connection object (and update anything it needs to update as a result).