Viewless Clipboard utility for vaadin flow web-apps

Clipboard.java

import com.vaadin.flow.component.UI;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;

public class Clipboard {

  public Clipboard() {
    String javaScriptFunction = "window.copyToClipboard = (str) => {\n"
        + "  const textarea = document.createElement(\"textarea\");\n"
        + "  textarea.value = str;\n"
        + "  textarea.style.position = \"absolute\";\n"
        + "  textarea.style.opacity = \"0\";\n"
        + "  document.body.appendChild(textarea);\n"
        + "  textarea.select();\n"
        + "  document.execCommand(\"copy\");\n"
        + "  document.body.removeChild(textarea);\n"
        + "};";
    UI.getCurrent().getPage().executeJs(javaScriptFunction);
  }

  public void copyTo(String value) {
    UI.getCurrent().getPage().executeJs("window.copyToClipboard($0)", value);
  }

}