连接Javafx fx：Id [英] Concatenate Javafx fx:Id

问题描述

我是 JavaFX 的新手，目前正在尝试为学校项目执行日历应用程序。我想知道是否有办法连接 fx：id 这样的

I'm kinda new to JavaFX and currently trying to do a Calendar application for a school project. I was wondering if there was a way to concatenate a fx:id such a

@FXML
private Label Box01;
 (In function)
 String ExampleNum = "01";
 (Box+ExampleNum).setText("Test");

推荐答案

除了@jewelsea提到的方法，这里有还有2种方法：

In addition to the methods mentioned by @jewelsea here are 2 more ways to do this:

1. 创建&注入一个 Map ，其中包含来自fxml的值：

1. Create & inject a Map containing the boxes as values from the fxml:

<VBox xmlns:fx="http://javafx.com/fxml/1" fx:controller="fxml.Controller">
    <children>
        <Label text="foo" fx:id="a"/>
        <Label text="bar" fx:id="b"/>
        <Spinner fx:id="number">
            <valueFactory>
                <SpinnerValueFactory.IntegerSpinnerValueFactory min="1" max="2"/>
            </valueFactory>
        </Spinner>
        <Button text="modify" onAction="#modify"/>
        <fx:define>
            <HashMap fx:id="boxes">
                <box1>
                    <fx:reference source="a"/>
                </box1>
                <box2>
                    <fx:reference source="b"/>
                </box2>
            </HashMap>
        </fx:define>
    </children>
</VBox>

控制器

public class Controller {

    private Map<String, Label> boxes;
    @FXML
    private Spinner<Integer> number;
    @FXML
    private Label box1;
    @FXML
    private Label box2;

    @FXML
    private void modify(ActionEvent event) {
        boxes.get("box"+number.getValue()).setText("42");
    }

}

通过<$ FXMLLoader 的c $ c> namespace ，这是 Map< String，Object> 将 fx：id 映射到关联的对象 s到控制器：

Pass the namespace of the FXMLLoader, which is a Map<String, Object> mapping fx:ids to the associated Objects, to the controller:

<VBox xmlns:fx="http://javafx.com/fxml/1" fx:controller="fxml.Controller">
    <children>
        <Label text="foo" fx:id="box1"/>
        <Label text="bar" fx:id="box2"/>
        <Spinner fx:id="number">
            <valueFactory>
                <SpinnerValueFactory.IntegerSpinnerValueFactory min="1" max="2"/>
            </valueFactory>
        </Spinner>
        <Button text="modify" onAction="#modify"/>
    </children>
</VBox>

控制器

public class Controller implements NamespaceReceiver {

    private Map<String, Object> namespace;
    @FXML
    private Spinner<Integer> number;
    @FXML
    private Label box1;
    @FXML
    private Label box2;

    @FXML
    private void modify(ActionEvent event) {
        ((Label)namespace.get("box" + number.getValue())).setText("42");
    }

    @Override
    public void setNamespace(Map<String, Object> namespace) {
        this.namespace = namespace;
    }
}

public interface NamespaceReceiver {
    public void setNamespace(Map<String, Object> namespace);
}

加载fxml的代码：

public static <T> T load(URL url) throws IOException {
    FXMLLoader loader = new FXMLLoader(url);
    T result = loader.load();
    Object controller = loader.getController();
    if (controller instanceof NamespaceReceiver) {
        ((NamespaceReceiver) controller).setNamespace(loader.getNamespace());
    }
    return result;
}

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