I want to drag and drop only On-screen.

function elementDrag(e: any) { console.log('drag elemet', e);

    if (
      (elmnt.offsetTop <= 0 || elmnt.offsetLeft <= 0) &&
      (e.movementY <= 0 || e.movementX <= 0)
    ) {
      return false;
    } else {
      e = e || window.event;
      e.preventDefault();
      pos1 = pos3 - e.clientX;
      pos2 = pos4 - e.clientY;
      pos3 = e.clientX;
      pos4 = e.clientY;
      elmnt.style.top = elmnt.offsetTop - pos2 + 'px';
      elmnt.style.left = elmnt.offsetLeft - pos1 + 'px';
    }
  }