CODEWITHSUNDEEP
javajavafx
John E.
John E.

Reputation: 55

Javafx - how to acces FXML "objects"

I have some JavaFX components declared in my fxml file.

The Frame

and how do I get the values of the fields (Username, Password) when the button is pressed? (To perform the login).

  Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
  stage.setTitle("Login");
  stage.setScene(new Scene(root,400,300));
  stage.show();

or is this the complete wrong way to do it?

My Questions:

  1. Is it a good idea to declare all fields in the fxml file?
  2. How do I get the objects to acces the Values?
  3. If its the complete wrong way, how can it be done? (I want to use scenebuilder)

EDIT : https://hastebin.com/qexipogoma.xml <- My FXML fie and my controller

Upvotes: 2

Views: 7892

Answers (3)

fabian
fabian

Reputation: 82461

Is it a good idea to declare all fields in the fxml file?

This depends on what you need. In this case you do not need to add/remove any parts of the scene dynamically. You'll probably replace the window/scene on a successful login. There should not be any issue with creating this scene via fxml.

How do I get the objects to acces the values?

Use a controller with the fxml and access the values via this controller.

<AnchorPane fx:controller="mypackage.LoginController" ...>
   <children>
      ...
      <TextField fx:id="username" ... />
      ...
      <PasswordField fx:id="password" ... />
      ...
      <Button onAction="#login" ... />
   </children>
</AnchorPane>

package mypackage;

...

public class LoginController {

    private boolean login = false;

    @FXML
    private TextField username;

    @FXML
    private PasswordField password;

    @FXML
    private void login() {
        // regular close the login window
        login = true;
        password.getScene().getWindow().hide();
    }

    public String getUsername() {
        return username.getText();
    }

    public String getPassword() {
        return password.getText();
    }

    public boolean isLogin() {
        return login;
    }

    public void resetLogin() {
        // allow reuse of scene for invalid login data
        login = false;
    }

}

FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
Stage stage = new Stage(new Scene(loader.load()));
LoginController controller = loader.getController();

boolean loginSuccess = false;

stage.showAndWait();

if (controller.isLogin()) {
    if (checkLogin(controller.getUsername(), controller.getPassword())) {
        // handle login success
    } else {
        // handle invalid login
    }
}

Upvotes: 4

Laurent Schwitter
Laurent Schwitter

Reputation: 464

Scene scene = stage.getScene();
Button btn = (Button) scene.lookup("#myBtnID");
TextField txt = (TextField ) scene.lookup("#myTxtID");

you're looking for:

txt.getText();

and 

btn.setOnAction( lambda here );

Documentation:

Button

TextField

EDIT: declare ids this way

<TextField fx:id="myTxtID" ...  />

Upvotes: 6

Jonathan Rosenne
Jonathan Rosenne

Reputation: 2217

Try using SceneBuilder. It will produce an FXML file and a compatible controller. This will give you a good start.

Upvotes: 1

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