function isElement(element) {
  return element instanceof Element || element instanceof HTMLDocument;
}
window.oncontextmenu = (e) => { // Değiştirilen kod  onclick değil de oncontextmenu
  let id = "myid",
    elemWidth = 250,
    elemHeight = 250,
    borderThickness = 2;

  if (isElement(document.getElementById(id)))
    document.getElementById(id).remove();

  let div = document.createElement("div");
  div.id = id;
  div.style.position = "absolute";
  div.style.border = `${borderThickness}px solid #ddd`;
  div.style.height = `${elemHeight}px`;
  div.style.width = `${elemWidth}px`;
  div.style.display = "none";

  e.clientX + elemWidth + borderThickness * 2 > window.innerWidth
    ? (div.style.right = `${window.innerWidth - e.clientX}px`)
    : (div.style.left = `${e.clientX}px`);
  e.clientY + elemHeight + borderThickness * 2 > window.innerHeight
    ? (div.style.bottom = `${window.innerHeight - e.clientY}px`)
    : (div.style.top = `${e.clientY}px`);

  document.body.appendChild(div);

  $(`#${id}`).show({
    effect: "fold",
    horizFirst: true,
    duration: 400
  });
  return false; // Eklenen kod
};