无法通过JavaScript进行JavaFX WebView向上调用

2022-11-30 11:25:56

我有一个JavaFX WebView,想从显示在Webview中的“ test.html”中调用类“ JavaBridge”的方法“ hello”.
为什么不起作用？我确保仅在完全渲染页面后才将“ bridge”对象添加到window.object中,因此这可能不是问题.我也看不到HTML的任何问题.

这是HTML代码(“ test.html”)：

<html>
<head>
</head>
<body>
    <a href="#click" onclick="bridge.hello()">call java</a>
</body>
</html>

这是Java代码：

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.concurrent.Worker.State;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import netscape.javascript.JSObject;

public class HelloWorld extends Application {

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

  @Override
  public void start(Stage primaryStage) {

    java.net.URI uri = java.nio.file.Paths.get("test.html").toAbsolutePath().toUri();
    WebView root = new javafx.scene.web.WebView();
    root.getEngine().load(uri.toString());

    root.getEngine().
    getLoadWorker().
    stateProperty().
    addListener(new ChangeListener < State > () {
      @Override public void changed(ObservableValue ov, State oldState, State newState) {

        if (newState == Worker.State.SUCCEEDED) {
          System.out.println("READY");
          JSObject jsobj = (JSObject) root.getEngine().executeScript("window");
          jsobj.setMember("bridge", new JavaBridge());
        }

      }
    });
    primaryStage.setScene(new javafx.scene.Scene(root, 800, 600));
    primaryStage.show();
  }
}

class JavaBridge {
  public void hello() {
    System.out.println("hello");
  }
}

解决方法:

您的内部类应该在主要类内部.它应该是公开的.像这样：

import java.net.URL;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.concurrent.Worker.State;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import netscape.javascript.JSObject;

public class HelloWorld extends Application {

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

    @Override
    public void start(Stage primaryStage) {

        final URL url = getClass().getResource("test.html");

        WebView root = new javafx.scene.web.WebView();
        root.getEngine().load(url.toExternalForm());

        root.getEngine().getLoadWorker().stateProperty().addListener(new ChangeListener<State>() {
            @Override
            public void changed(ObservableValue ov, State oldState, State newState) {

                if (newState == Worker.State.SUCCEEDED) {
                    System.out.println("READY");
                    JSObject jsobj = (JSObject) root.getEngine().executeScript("window");
                    jsobj.setMember("bridge", new JavaBridge());
                }

            }
        });
        primaryStage.setScene(new javafx.scene.Scene(root, 800, 600));
        primaryStage.show();
    }

    public class JavaBridge {
        public void hello() {
            System.out.println("hello");
        }
    }
}

码农公寓

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