FXML中的JavaScript脚本 [英] JavaScript script in a FXML

问题描述

我正在尝试从FXML运行以下示例

I'm trying to run the following example from FXML reference:

此示例包括在JavaScript脚本中声明String变量，然后稍后在FXML中将其与$运算符一起使用，以在Label中显示String.

This example consists in declaring a String variable in a JavaScript script and using it later in the FXML with the $ operator for displaying the String in a Label.

问题是，当我使用Java 8u40运行此示例时，Label为空而不是显示声明的String.

The problem is that when I run this example with Java 8u40, the Label is empty instead of showing the declared String.

JavaFxComponent.java:

JavaFxComponent.java:

public class JavaFxComponent extends VBox {
    public JavaFxComponent() throws Exception {
        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/JavaFxComponent.fxml"));
        fxmlLoader.setRoot(this);
        fxmlLoader.load();
    }
}

JavaFxComponent.fxml:

JavaFxComponent.fxml:

<?xml version="1.0" encoding="UTF-8"?>
<?language javascript?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<fx:root type="javafx.scene.layout.VBox" xmlns="http://javafx.com/javafx/8"
    xmlns:fx="http://javafx.com/fxml">
    <fx:script>
        var myText = "This is the text of my label.";
    </fx:script>
    <Label text="$myText" />
</fx:root>

JavaFxTest:

JavaFxTest:

public class JavaFxTest extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setScene(new Scene(new JavaFxComponent()));
        primaryStage.show();
    }

    public static final void main(String[] args) {
        launch(args);
    }
}

推荐答案

似乎"var myText"未在"$"执行查找的范围内创建引用.这可能不是您要找的答案，但是对于那些偶然发现同一问题的人，至少在解决此问题或有人对此事有所了解之前，我相信为他们提起替代方案会很有用.

It seems that "var myText" doesn't create a reference in the scope where '$' performs lookup. This is probably not the answer you were looking for, however I believe it will be useful to mention alternatives for those who stumble upon the same issue, at least until this is resolved or someone sheds more light on the matter.

1. 
   

1. 
   

<fx:define>
     <String fx:id="myText" fx:value="This is the text of my label." /> 
</fx:define>
<Label text="$myText" />

<Label fx:id="myLabel" />
<fx:script>
    myLabel.text = "This is the text of my label.";
</fx:script>

注意:要使第一种方法起作用，必须导入<?import java.lang.String?>.

Note: for 1st method to work <?import java.lang.String?> needs to be imported.

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