无法从Windows上的WebView JavaScript调用JavaFX（VirtualBox） [英] Cannot call JavaFX from WebView JavaScript on Windows (VirtualBox)
本文介绍了无法从Windows上的WebView JavaScript调用JavaFX（VirtualBox）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
以下代码适用于Linux，但回调在Windows（VirtualBox VM）上不起作用。你能告诉我为什么吗？
The following code works on Linux, but the callback does not work on Windows (VirtualBox VM). Can you please tell me why?
Java：
public class WebViewTest extends Application {
private Label label = new Label ("...");
public static void main (String[] args) {
launch (args);
}
@Override
public void start (Stage stage) throws Exception {
WebView webView = new WebView ();
WebEngine webEngine = webView.getEngine ();
webEngine.setJavaScriptEnabled (true);
JSObject window = (JSObject) webView.getEngine ().executeScript ("window");
window.setMember ("java", new Callback ());
webEngine.load (getClass ().getResource ("WebViewTest.html").toString ());
BorderPane pane = new BorderPane ();
pane.setCenter (webView);
pane.setBottom (label);
Scene scene = new Scene (pane);
stage.setScene (scene);
stage.show ();
}
public class Callback {
public void click () {
label.setText ("Clicked :-)");
}
}
}
HTML：
<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<meta charset="UTF-8">
</head>
<body>
<button onclick="window.java.click ();">Test</button>
</body>
</html>
推荐答案
诀窍是将Callback创建为类字段：
The trick was to create the Callback as a class field:
private Callback callback = new Callback ();
然后：
webEngine.load (getClass ().getResource ("WebViewTest.html").toString ());
JSObject window = (JSObject) webView.getEngine ().executeScript ("window");
// BUG // window.setMember ("java", new Callback ());
window.setMember ("java", callback);
也许在Windows上有一些垃圾收集？我不知道......
Maybe there is some abusive garbage collecting on Windows? I don't know...
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