CODEWITHSUNDEEP
javamodel-view-controllerjavafxgetter-setter
Nepal12
Nepal12

Reputation: 593

Javafx how to access controls of second controller from first controller

I have one question regarding Javafx controller. Lets say, I have multiple fxml files that are bind together in a main app. Then I have separate controllers for every fxml files. Lets see the following structure

com.par.app
  - MainApp.java   -> This is the main Application
  - FirstController.java 
  - SecondController.java

com.par.app.view
  - First.fxml
  - Second.fxml 

com.par.app.model
  - MyModel   -> This has some getter and setter methods.

Now as per above structure, I have a checkbox in First.fxml and a label in Second.fxml.

My Question : How can i set the label text in Second.FXML by checking and unchecking the checkbox in First.FXML , I have tried like this:

// In FirstController.Java
  1) Initialize the SecondController
  2) Get checkbox from FXMl as , priate CheckBox box1;
  3) On initialize(....) method, I have set the event handler, as box1.setOnAction(enableHandle)
  4) Finally the event Handler as,
  EventHandler<ActionEvent> enableHandle = new EventHandler<ActionEvent>() {
    @Override
    public void handle(ActionEvent event) {
        if (box1.isSelected()) {

            secondController.setLabelText("PoP");
        } else {
            secondController.setText("Gone Wrong");
        }
    }
};

Similarly, On my second controller I have declared FXML control as, 
@FXML
private Label lblTes;

// the method
public void setLabelText(String a)
{
 this.lblTes.settest(a);
}

-> The above wont work as it returns Unknown Source.

The next way I tried is by using the MyModel , and using getter and setter methods, But unsuccessful.

I'm sorry my question is really long. I have tried but not succeeded. What can I do to solve this?

Thanks in advance.

// my model looks like
public class MyModel {
   private String btnname;
   public String getBtnname() {
       return btnname;
   }
   public void setBtnname(String btnname) {
       this.btnname = btnname;
   }
}

Upvotes: 0

Views: 703

Answers (1)

Olivier Meurice
Olivier Meurice

Reputation: 562

When you check the check box then in the controller of the FirstView (where you implement an event handler for the check box click) change the label text in your model. Your model should be bound to your views therefore the label text in your SecondView should be updated.

If you did not bind the model to your views you may use an Observer pattern.

1.Change your model and extend java.util.Observable

public class MyModel extends Observable {
  private String btnname;
  public String getBtnname() {
    return btnname;
  }
  public void setBtnname(String btnname) {
    this.btnname = btnname;
    pingObservers()
  }
  private void pingObservers() {
   setChanged();
   notifyObservers();
  }
}

  1. Register your SecondController as an Observer of the model. When you set the model to the controller add a line similar to this: model.addObserver(this);

  2. SecondController must implement java.util.Observer.update(...)
    void update(Observable o, Object o1) { // Set the label text with model value }

  3. In you event handler in the FirstController when you call the setBtnname() method on your model the update() method in the SecondController will be called. There up to you to add the code to change your label text. Since the label is in the view controlled by SecondController you just need to inject a reference of the label in the controller with @FXML annotation.

Upvotes: 1

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