import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
 
// -Dprism.verbose=true -Xmn128m -Dsun.net.http.allowRestrictedHeaders=true -Djavafx.allowjs=true -XX:+UseZGC -Xms512m -Xmx512m

/**
 * A sample that demonstrates a WebView object accessing a web page.
 */
public class WebViewTest extends Application {
 
 
    public Parent createContent() {
 
        WebView webView = new WebView();
 
        final WebEngine webEngine = webView.getEngine();
        final String DEFAULT_URL = "http://www.youtube.com";
        webEngine.load(DEFAULT_URL);
 
        final TextField locationField = new TextField(DEFAULT_URL);
        final ChangeListener<String> changeListener =
            (ObservableValue<? extends String> observable,
             String oldValue, String newValue) -> {
                locationField.setText(newValue);
            };
        webEngine.locationProperty().addListener(changeListener);
        EventHandler<ActionEvent> goAction = (ActionEvent event) -> {
            webEngine.load(locationField.getText().startsWith("http://")
                    ? locationField.getText()
                    : "http://" + locationField.getText());
        };
        locationField.setOnAction(goAction);
 
        Button goButton = new Button("Go");
        goButton.setMinSize(Button.USE_PREF_SIZE, Button.USE_PREF_SIZE);
        goButton.setDefaultButton(true);
        goButton.setOnAction(goAction);
 
        // Layout logic
        HBox hBox = new HBox(5);
        hBox.getChildren().setAll(locationField, goButton);
        HBox.setHgrow(locationField, Priority.ALWAYS);
 
        final VBox vBox = new VBox(5);
        vBox.getChildren().setAll(hBox, webView);
        vBox.setPrefSize(800, 400);
        VBox.setVgrow(webView, Priority.ALWAYS);
        return vBox;
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setScene(new Scene(createContent()));
        primaryStage.show();
    }
 
    /**
     * Java main for when running without JavaFX launcher
     */
    public static void main(String[] args) {
        launch(args);
    }
}