micheljung/WebViewBug.java

## WebViewBug.java
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.concurrent.Worker.State;
import javafx.scene.Scene;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import javafx.util.Duration;
import netscape.javascript.JSObject;

import java.util.concurrent.atomic.AtomicInteger;

public class WebViewBug extends Application {

  private WebEngine engine;
  private AtomicInteger testNumber;

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

  @Override
  public void start(Stage primaryStage) throws Exception {
    testNumber = new AtomicInteger();
    WebView webView = new WebView();
    engine = webView.getEngine();
    engine.loadContent("<!DOCTYPE html>\n" +
        "<html>\n" +
        "<head>\n" +
        "  <style type=\"text/css\">\n" +
        "    .row:nth-child(odd) {\n" +
        "      background: #ccc;\n" +
        "    }\n" +
        "  </style>\n" +
        "</head>\n" +
        "<body id=\"content\">\n" +
        "</body>\n" +
        "</html>");
    primaryStage.setScene(new Scene(webView, 100, 100));
    primaryStage.show();

    Timeline timeline = new Timeline(
        new KeyFrame(Duration.millis(200), (actionEvent)
            -> append(("<div class=\"row\">Test " + String.valueOf(testNumber.incrementAndGet()) + "</div>")))
    );
    timeline.setCycleCount(-1);

    engine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> {
      if (newValue == State.SUCCEEDED) {
        timeline.playFromStart();
      }
    });
  }

  private void append(String html) {
    ((JSObject) engine.executeScript("document.getElementById('content')"))
        .call("insertAdjacentHTML", "beforeend", html);
    engine.executeScript("window.scrollTo(0, document.documentElement.scrollHeight);");
  }
}
	import javafx.animation.KeyFrame;
	import javafx.animation.Timeline;
	import javafx.application.Application;
	import javafx.concurrent.Worker.State;
	import javafx.scene.Scene;
	import javafx.scene.web.WebEngine;
	import javafx.scene.web.WebView;
	import javafx.stage.Stage;
	import javafx.util.Duration;
	import netscape.javascript.JSObject;

	import java.util.concurrent.atomic.AtomicInteger;

	public class WebViewBug extends Application {

	private WebEngine engine;
	private AtomicInteger testNumber;

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

	@Override
	public void start(Stage primaryStage) throws Exception {
	testNumber = new AtomicInteger();
	WebView webView = new WebView();
	engine = webView.getEngine();
	engine.loadContent("<!DOCTYPE html>\n" +
	"<html>\n" +
	"<head>\n" +
	" <style type=\"text/css\">\n" +
	" .row:nth-child(odd) {\n" +
	" background: #ccc;\n" +
	" }\n" +
	" </style>\n" +
	"</head>\n" +
	"<body id=\"content\">\n" +
	"</body>\n" +
	"</html>");
	primaryStage.setScene(new Scene(webView, 100, 100));
	primaryStage.show();

	Timeline timeline = new Timeline(
	new KeyFrame(Duration.millis(200), (actionEvent)
	-> append(("<div class=\"row\">Test " + String.valueOf(testNumber.incrementAndGet()) + "</div>")))
	);
	timeline.setCycleCount(-1);

	engine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> {
	if (newValue == State.SUCCEEDED) {
	timeline.playFromStart();
	}
	});
	}

	private void append(String html) {
	((JSObject) engine.executeScript("document.getElementById('content')"))
	.call("insertAdjacentHTML", "beforeend", html);
	engine.executeScript("window.scrollTo(0, document.documentElement.scrollHeight);");
	}
	}