来自 Javascript 的 WebView 回调 [英] WebView callback from Javascript
问题描述
我尝试基于 WebEngine 的 javadoc 中的最后一个示例(从 JavaScript 回调到 Java).但是当我点击WebView中的链接时，没有调用Java方法，页面消失.
I tried to create a simple example of callback from Javascript to Java, based on the last example in WebEngine's javadoc (Calling back to Java from JavaScript). But when I click the link in the WebView, the Java method is not called and the page disappears.
public class TestOnClick extends Application {
@Override
public void start(Stage stage) throws Exception {
try {
final WebView webView = new WebView();
final WebEngine webEngine = webView.getEngine();
Scene scene = new Scene(webView);
stage.setScene(scene);
stage.setWidth(1200);
stage.setHeight(600);
stage.show();
String webPage = "<html>
"
+ " <body>
"
+ " <a href="" onclick="app.onClick()">Click here</a>
"
+ " </body>
"
+ "</html>";
System.out.println(webPage);
webView.getEngine().loadContent(webPage);
JSObject window = (JSObject) webEngine.executeScript("window");
window.setMember("app", new JavaApp());
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
public static class JavaApp {
public void onClick() {
System.out.println("Clicked");
}
}
}
注意:使用 webView.getEngine().getLoadWorker().exceptionProperty().addListener(...) 监视负载工作器时，我没有看到 WebView 中抛出任何异常.
Note: I don't see any exceptions being thrown in the WebView when monitoring the load worker with webView.getEngine().getLoadWorker().exceptionProperty().addListener(...).
推荐答案
您正在尝试在创建 webview DOM 模型之前访问它.
You are trying to access webview DOM model before it was created.
将您的 JavaApp 相关代码包装到页面加载侦听器中以实现您的目标:
Wrap your JavaApp related code to the page load listener to achieve your goal:
webEngine.getLoadWorker().stateProperty().addListener(new ChangeListener<Worker.State>() {
@Override
public void changed(ObservableValue<? extends State> ov, State t, State t1) {
if (t1 == Worker.State.SUCCEEDED) {
JSObject window = (JSObject) webEngine.executeScript("window");
window.setMember("app", new JavaApp());
}
}
});
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