打开新 window 时未加载 FXML 标签值

Question

When I want to open a new window on a click event I need to load some a value in a label, but the value is not refreshed. I have tried load the new window an instantiate the label and set a value to be displayed, but nothing happens. Bellow is the fxml and the code:

public class PetshopController implements Initializable {
@FXML
    public ListView<String> ListaProgramari;
@FXML
    public void completeTheAppointment(MouseEvent e) {
        try {
            String animalName = ListaProgramari.getSelectionModel().getSelectedItem();
            DiagnosticController dc = new DiagnosticController();
            dc.openDiagnosticWindow(animalName);
        } catch (Exception e1) {
            e1.printStackTrace();
        }
    }
}

public class DiagnosticController implements Initializable{

    @FXML
    private Label animalName = new Label();
    @FXML
    public TextField newDiagnostic;
    @FXML
    public Pane AnimalDetails;
    @Override
    public void initialize(URL location, ResourceBundle resources) {

    }

    public void openDiagnosticWindow(String animalLabel) {
        try {
            animalName = new Label();
            animalName.setText(animalLabel);
            BorderPane root = (BorderPane) FXMLLoader.load(getClass().getResource("/controller/Diagnostic.fxml"));
            Scene scene = new Scene(root, 600, 400);
            scene.getStylesheets().add(getClass().getResource("/controller/application.css").toExternalForm());
            Stage stage = new Stage();
            stage.setScene(scene);
            stage.show();           

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

Bellow is the FXML. This contains all the items from the new window which is opened the problem is at the label: "animalName":

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.MenuBar?>
<?import javafx.scene.control.SplitPane?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>

<BorderPane prefHeight="303.0" prefWidth="452.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.DiagnosticController">
   <top>
      <MenuBar prefHeight="0.0" prefWidth="480.0" BorderPane.alignment="CENTER" />
   </top>
   <center>
      <SplitPane dividerPositions="0.6445182724252492" orientation="VERTICAL" prefHeight="200.0" prefWidth="160.0" BorderPane.alignment="CENTER">
        <items>
          <AnchorPane fx:id="AnimalDetails" minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
               <children>
                  <TextField fx:id="newDiagnostic" layoutX="190.0" layoutY="131.0" />
                  <Label layoutX="48.0" layoutY="135.0" prefHeight="17.0" prefWidth="120.0" text="Adauga Diagnostic" />
                  <Label layoutX="42.0" layoutY="75.0" prefHeight="17.0" prefWidth="120.0" text="Numele Animalului:" />
                  <Label fx:id="animalName" layoutX="189.0" layoutY="75.0" prefHeight="17.0" prefWidth="145.0" text="empty" />
               </children>
            </AnchorPane>
          <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="49.0" prefWidth="450.0">
               <children>
                  <Button fx:id="completeConsultation" layoutX="172.0" layoutY="46.0" mnemonicParsing="false" onMouseClicked="#completeConsultation" prefHeight="36.0" prefWidth="79.0" text="Complete" />
               </children>
            </AnchorPane>
        </items>
      </SplitPane>
   </center>
</BorderPane>

Answer 1

通过执行 @FXML private Label animalName = new Label();，您构建了一个新标签，而不是 fxml 已经创建的标签。事实上你做了两次：这个标签在 openDiagnosticWindow 中被 animalName = new Label();
再次初始化只需使用 @FXML public Label animalName;

另一个问题在这些行中：

 DiagnosticController dc = new DiagnosticController();
 dc.openDiagnosticWindow(animalName);

dc 是对 DiagnosticController 实例的引用，但不是 fxml 使用的实例。

要获取 fxml 使用的控制器的引用，您需要从加载程序中获取它：

FXMLLoader loader = new FXMLLoader();
BorderPane root =  loader.load(getClass().getResource("/controller/Diagnostic.fxml")                                                                                .openStream());
DiagnosticController dc = (DiagnosticController)loader.getController();

这意味着加载 Diagnostic.fxml 应该由 PetshopController 而不是 DiagnosticController。

如需更多帮助，请postmcve。重要信息丢失（比如 fxml 文件的名称是什么 posted ？什么调用了 PetshopController ？等等）这迫使我们猜测。

打开新 window 时未加载 FXML 标签值

FXML Label value is not loaded when new window is opened

java

controller

fxml