JavaFX FXML 标签不更新其值

Posted 2023-02-26

【中文标题】JavaFX FXML 标签不更新其值

【英文标题】：JavaFX FXML Label doesn't update its value

【发布时间】：2016-05-10 10:32:02

【问题描述】：

我正在尝试从另一个控制器更新标签，但它不会在视觉上更新。

以下控制器控件动态加载外部控制器。

private ClientShowController clientShowController; 

public void initialize() 

    try  
        pane_clientDetail.getChildren().add(FXMLLoader.load(getClass().getResource("../resources/Client_show.fxml")));
        FXMLLoader loader = new FXMLLoader(getClass().getResource("../resources/Client_show.fxml")); 
        loader.load(); 

        clientShowController = (ClientShowController) loader.getController(); 
        System.out.println(clientShowController);

     catch (IOException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    
 

private void showPersonDetails(Person person) 
    if (person != null)  
        //Update 
        clientShowController.setId(Integer.toString(person.getId()));
    
 

第二个控制器：

@FXML private Label lbl_id;    

public void setId(String strId)
    System.out.println(strId);
    lbl_id.setText(strId);
    System.out.println(lbl_id);

注意：

System.out 正确显示标签上的 id； 第二个控制器与第一个控制器中嵌入的 FXML 文件相关联。如代码所示，第二个 FXML 文件/控制器是动态加载的：pane_clientDetail.getChildren().add()。

在第二个控制器的初始化方法中设置id时，id如预期的那样显示在标签中：

公共无效初始化（） this.setId("12");

编辑：

第一个（主要）FXML 定义：

<Pane fx:id="pane_clientDetail"/>

这个窗格被声明为属性

@FXML private Pane pane_clientDetail;

第二个：

<GridPane xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.controllers.ClientShowController">
  <columnConstraints>
    <ColumnConstraints hgrow="SOMETIMES" maxWidth="144.0" minWidth="10.0" prefWidth="102.0" />
    <ColumnConstraints hgrow="SOMETIMES" maxWidth="195.0" minWidth="10.0" prefWidth="195.0" />
  </columnConstraints>
  <rowConstraints>
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
    <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
  </rowConstraints>
   <children>
      <Label text="given name" GridPane.rowIndex="1">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="family name" GridPane.rowIndex="2">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="gender" GridPane.rowIndex="3">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="email" GridPane.rowIndex="4">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="phone" GridPane.rowIndex="5">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="id">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="address" GridPane.rowIndex="6">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label text="zip" GridPane.rowIndex="7">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label fx:id="lbl_id" text="-" GridPane.columnIndex="1">
         <GridPane.margin>
            <Insets />
         </GridPane.margin>
      </Label>
      <Label fx:id="lbl_given_name" text="-" GridPane.columnIndex="1" GridPane.rowIndex="1" />
      <Label fx:id="lbl_family_name" text="-" GridPane.columnIndex="1" GridPane.rowIndex="2" />
      <Label fx:id="lbl_gender" text="-" GridPane.columnIndex="1" GridPane.rowIndex="3" />
      <Label fx:id="lbl_email" text="-" GridPane.columnIndex="1" GridPane.rowIndex="4" />
      <Label fx:id="lbl_phone" text="-" GridPane.columnIndex="1" GridPane.rowIndex="5" />
      <Label fx:id="lbl_address" text="-" GridPane.columnIndex="1" GridPane.rowIndex="6" />
      <Label fx:id="lbl_zip" text="-" GridPane.columnIndex="1" GridPane.rowIndex="7" />
      <Label text="city" GridPane.rowIndex="8">
         <GridPane.margin>
            <Insets left="10.0" />
         </GridPane.margin>
      </Label>
      <Label fx:id="lbl_city" text="-" GridPane.columnIndex="1" GridPane.rowIndex="8" />
   </children>
   <VBox.margin>
      <Insets top="10.0" />
   </VBox.margin>
</GridPane>

【问题讨论】：

你也可以添加fxml的定义吗？嵌入式是什么意思？

【参考方案1】：

您似乎有两个 UI 实例：

1. pane_clientDetail.getChildren().add(FXMLLoader.load(getClass().getResource("../resources/Client_show.fxml")));

2. FXMLLoader loader = new FXMLLoader(getClass().getResource("../resources/Client_show.fxml")); 

您首先加载一个视图并将其附加到pane_clientDetail，这就是正在显示的视图。然后你创建另一个并获得它的控制器。由于显而易见的原因，第二个控制器不会更新第一个视图。

解决方案：

FXMLLoader loader = new FXMLLoader(getClass().getResource("../resources/Client_show.fxml"));
Parent view = loader.load();
pane_clientDetail.getChildren().add(view);
// rest of the code