JavaFX:将文本字段和标签添加到场景

Question

我正在尝试获得两个选项卡，每个选项卡都有自己的小表单，其中包含标签和文本字段/文本区域。我认为我制作了一个“主”VBox，它应该显示所有内容，但除了显示选项卡之外什么都没有，我也没有收到任何错误。如何将它们添加到场景中？

    // Label and Button variables
private Label fname,lname, appt, AppointmentInfo;
protected String input;

@Override
public void start(Stage primaryStage) throws Exception {
    primaryStage.setTitle("Person Appointments");
    primaryStage.setWidth(500);
    primaryStage.setHeight(500);

    //Create and set Tab Names
    Tab InfoTab = new Tab();
    Tab ApptTab = new Tab();
    InfoTab.setText("PersonInfo");
    ApptTab.setText("Appointments");

    // VBoxes
    VBox personInfoBox = new VBox();
    VBox FirstBox = new VBox();
    VBox appointmentBox = new VBox();

    // Setup labels and fields
    fname = new Label();
    lname = new Label();
    appt = new Label();
    AppointmentInfo = new Label();
    fname.setText("First Name");
    lname.setText("Last Name");
    appt.setText("Appt Count");
    AppointmentInfo.setText("Appt Info");

    // Text Fields
    TextField firstNameText = new TextField();
    TextField lastNameText = new TextField();
    TextField appointmentText = new TextField();
    TextArea apptInfo = new TextArea();
    firstNameText.setText("First Name Here");
    lastNameText.setText("Last Name Here");
    appointmentText.setText("Appointment Here");
    personInfoBox.getChildren().add(fname);
    personInfoBox.getChildren().addAll(firstNameText);
    personInfoBox.getChildren().add(lname);
    personInfoBox.getChildren().addAll(lastNameText);
    appointmentBox.getChildren().add(AppointmentInfo);
    appointmentBox.getChildren().addAll(apptInfo);


    // Grid for Tabs
    GridPane grid = new GridPane();
    GridPane grid2 = new GridPane();
    grid.add(fname, 0, 0);
    grid.add(firstNameText, 0, 1);
    grid.add(lname, 1, 0);
    grid.add(lastNameText, 1, 1);
    grid.add(appt, 2, 0);
    grid.add(appointmentText, 2, 1);
    grid2.add(AppointmentInfo, 0, 0);
    grid2.add(apptInfo, 0, 1);
    InfoTab.setContent(grid);
    ApptTab.setContent(grid2);

    // TabPane
    TabPane tabPane = new TabPane();
    tabPane.getTabs().add(InfoTab);
    tabPane.getTabs().add(ApptTab);
    InfoTab.setClosable(false);
    ApptTab.setClosable(false);


    InfoTab.setContent(personInfoBox);
    ApptTab.setContent(appointmentBox);
    VBox one = new VBox(tabPane, personInfoBox);
    Scene scene = new Scene(one, 500, 500);
    primaryStage.setScene(scene);
    primaryStage.show();`

Answer 1

您不能将一个节点多次分配给SceneGraph:

A node may occur at most once anywhere in the scene graph. Specifically, a node must appear no more than once in all of the following: as the root node of a Scene, the children ObservableList of a Parent, or as the clip of a Node.

http://docs.oracle.com/javase/8/javafx/api/javafx/scene/Node.html

您分配了例如lname 到 personInfoBox 和 grid。所以最后 lname 将只分配给网格。然后将 grid 设置为 Tab 的内容，然后将 personInfoBox 设置为内容，现在为空