Java 将fxml加载到容器中时的getParent（）

这是我的主页控制器，可在

borderPane

center中加载

home.fxml

：

MainController.java

public class MainController implements Initializable {

@FXML   private BorderPane borderPane;

@Override
public void initialize(URL location, ResourceBundle resources) {
    try {
        Connection connection = SqlConnection.dbConnector();

        //JDBC connection initial check
        if (connection != null) {
            newLoginStage();
            connection.close();
        }
        goToHome();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

//ToolBar Methods
@FXML   public void goToHome() throws Exception {
    toolBarButtonClick(homeTB, "home.fxml");
}
@FXML   private void logout() throws Exception {
    Stage stage = (Stage) borderPane.getScene().getWindow();
    stage.hide();
    newLoginStage();
    stage.show();
}
@FXML   public void exit() throws Exception {
}

private void toolBarButtonClick(Button button, String fxml) throws Exception {
    button.setDisable(true);
}
private void newMainContent(String fxml) throws Exception {
    FXMLLoader fxmlLoader = new FXMLLoader();
    fxmlLoader.setLocation(getClass().getResource(fxml));
    borderPane.setCenter(fxmlLoader.load());
}

public class HomeController implements Initializable {

    @FXML
    private BorderPane borderPane;


    @Override
    public void initialize(URL location, ResourceBundle resources) {
    mainContent = new MainContent(borderPane);
    BorderPane parentBorderPane = (BorderPane)borderPane.getParent();
    parentBorderPane.setLeft(null);
}

HomeController.java

public class MainController implements Initializable {

@FXML   private BorderPane borderPane;

@Override
public void initialize(URL location, ResourceBundle resources) {
    try {
        Connection connection = SqlConnection.dbConnector();

        //JDBC connection initial check
        if (connection != null) {
            newLoginStage();
            connection.close();
        }
        goToHome();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

//ToolBar Methods
@FXML   public void goToHome() throws Exception {
    toolBarButtonClick(homeTB, "home.fxml");
}
@FXML   private void logout() throws Exception {
    Stage stage = (Stage) borderPane.getScene().getWindow();
    stage.hide();
    newLoginStage();
    stage.show();
}
@FXML   public void exit() throws Exception {
}

private void toolBarButtonClick(Button button, String fxml) throws Exception {
    button.setDisable(true);
}
private void newMainContent(String fxml) throws Exception {
    FXMLLoader fxmlLoader = new FXMLLoader();
    fxmlLoader.setLocation(getClass().getResource(fxml));
    borderPane.setCenter(fxmlLoader.load());
}

public class HomeController implements Initializable {

    @FXML
    private BorderPane borderPane;


    @Override
    public void initialize(URL location, ResourceBundle resources) {
    mainContent = new MainContent(borderPane);
    BorderPane parentBorderPane = (BorderPane)borderPane.getParent();
    parentBorderPane.setLeft(null);
}

---

我本来打算在主页上隐藏

borderPane

的左侧部分，但是我无法在

HomeController.java

中使用

borderPane.getParent（）

获取父级，您不能只设置

borderPane.setLeft（null）吗home.fxml

后，在MainController中的

newMainContent（String fxml）

方法中的code>？在``fxmloader.load（）`过程中调用控制器中的

initialize（）

方法，即在退出

load（）

之前调用该方法。因此，FXML的根节点不可能在此时添加到父节点，因此

getParent（）

将返回null。正如@MBec所建议的，更新包含其UI的任何节点的内容实际上不是“子”控制器的责任；这应该由主控制器完成。