Question

我在FXMLController中有一个TextField和一个按钮，在SecondFXMLController中有一个标签

现在我想在SecondFXMLController中获取TextField的值

注意：将在同一阶段加载两个fxml文件

FXMLController：

public class FXMLDocumentController implements Initializable {

    @FXML
    private Label label;
    @FXML
    private Button button;
    @FXML
    private TextField firstField;
    @FXML
    private AnchorPane first;

    private int a;

    @FXML
    private void handleButtonAction(ActionEvent event) throws IOException {
        AnchorPane pane = FXMLLoader.load(getClass().getResource("SecondFXML.fxml"));
        first.getChildren().setAll(pane);   
    }

    public String setTo() {
        System.out.println("In setTo function");
        System.out.println(firstField.getText());
        return firstField.getText();
    }

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // TODO
    } 
}

SecondFXMLController：

public class SecondFXMLController implements Initializable 
{

    @FXML
    private Label secondField;
    private String f;
    private AnchorPane pane;
    private FXMLDocumentController con;
    /**
     * Initializes the controller class.
     */
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // TODO

        FXMLLoader fxml = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));

        try {
            pane  = fxml.load();
            con = fxml.getController();
            f = con.setTo(); 
        } catch (IOException ex) {
           Logger.getLogger(SecondFXMLController.class.getName()).log(Level.SEVERE, null, ex);
        }
        System.out.println(f);
        secondField.setText(f);
    }    
}

现在问题是我无法在setTo（）函数中获取textField的值，因此返回null。 注意：两个FXML文件都应该在同一阶段加载

任何人都可以提供解决方案

Answer 1

我建议返回StringProperty，而不是从方法返回String。稍后您可以将此String属性绑定到Label的textProperty。

public class FXMLDocumentController implements Initializable {

    ...
    @FXML
    private TextField firstField;
    ...

    public StringProperty firstFieldTextProperty() {
        return firstField.textProperty();
    }
    ...
}

在SecondFXMLController中，只需将secondLabel的textProperty绑定到该方法。

public class SecondFXMLController implements Initializable {

    @FXML
    private Label secondField;
    ...

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        ...
        FXMLLoader fxml = new FXMLLoader(getClass().getResource("FXMLDocument.fxml"));
        pane  = fxml.load();
        con = fxml.getController();
        secondField.textProperty.bind(con.firstFieldTextProperty());
        ...
    }    
}

如何在另一个控制器中检索控制器的值在JavaFX中

1 个答案: