JavaFX在父控制器内部加载FXML

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我试过很多解决办法，但都没有达到我的目标。应用程序加载UsersMainPageController，它只包含一个AnchorPane（类似于父控件），因此这是相关代码：

[UsersMainPageController]

public class UsersMainPageController implements Initializable {

    private PostOffice application;

    @FXML
    private AnchorPane ParentControl;

    public void setApp(PostOffice application){
        this.application = application;
    } 

    public void loadPage(String pageName) {
        try {                    
            URL url = getClass().getResource(pageName);
            FXMLLoader fxmlLoader = new FXMLLoader();
            fxmlLoader.setLocation(url);
            fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
            AnchorPane page = (AnchorPane) fxmlLoader.load(url.openStream()); 

            ParentControl.getChildren().clear();///name of pane where you want to put the fxml.
            ParentControl.getChildren().add(page);

        } 
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void loadManageUsers () {
        loadPage("UsersManage.fxml");
    }

    public void loadListUsers () {
        loadPage("UsersList.fxml");
    }

    /**
     * Initializes the controller class.
     */

    @Override
    public void initialize(URL url, ResourceBundle rb) {
        loadListUsers();
    }

}

public class UsersListController implements Initializable {
    private UsersMainPageController mainController;

    @FXML
    private void handleButtonEditAction(ActionEvent event) throws IOException {
        mainController.loadManageUsers();
    }
}

public class UsersManageController implements Initializable {
    private UsersMainPageController mainController;

    @FXML
    private void handleButtonBackAction(ActionEvent event) throws IOException {
    mainController.loadListUsers();
    }
}

Caused by: java.lang.NullPointerException
    at postoffice.multiuser.UsersListController.handleButtonAggiornaAction(UsersListController.java:210)
    ... 50 more

Answer 1

您可以将子fxml添加到父控制器中。

1.首先，只需使用一个锚窗格，并将它的界限设置在您想要放置FXML代码的地方。

现在试试这个...

 button.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent t) {
                openNewWindow("Example.fxml");
        }
    });

public void openNewWindow(String FXMLFile)
 {
     //ChildNode child;
    try {                    
        URL url = getClass().getResource(FXMLFile);
        FXMLLoader fxmlLoader = new FXMLLoader();
        fxmlLoader.setLocation(url);
        fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
        AnchorPane page = (AnchorPane) fxmlLoader.load(url.openStream()); 

        anchor.getChildren().clear();///name of pane where you want to put the fxml.
        anchor.getChildren().add(page);
    } 
    catch (IOException e) {
        e.printStackTrace();
    }
 }