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親 div 内のドラッグ可能な div の左上隅の座標を取得しようとしています。親divでマウスの座標を取得できます。これはonmousemoveタグによって行われます。onmove たとえば、divの座標を取得するために使用する、同様のタグがあることを確認しました。私が使用したコードは以下のとおりです

<!DOCTYPE html>
<html>
        <style>
        #parent {
            width: 148mm;
            height: 160mm;
            background-color: yellow;
            position: relative;
            <!--border: 3px solid #e5e5e5;-->
            
        }
        #mydiv {
          position: absolute;
          z-index: 9;
          
          text-align: center;
          border: 1px solid #d3d3d3;
        }

        #mydivheader {
          padding: 10px;
          cursor: move;
          z-index: 10; 
        }
        </style>

        <body>
            <div id="parent" style="float:left" onmouseout="clearCoor()">
                <div id="mydiv">
                  <div id="mydivheader" onmove="showCoords(event)"><img src="bc.png" alt="image"></div>
                </div>
            </div>
            <p id="demo"></p>
        <script>
        //Make the DIV element draggagle:
        dragElement(document.getElementById("mydiv"));

        function dragElement(elmnt) {
          var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
          if (document.getElementById(elmnt.id + "header")) {
            /* if present, the header is where you move the DIV from:*/
            document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
          } else {
            /* otherwise, move the DIV from anywhere inside the DIV:*/
            elmnt.onmousedown = dragMouseDown;
          }

          function dragMouseDown(e) {
            e = e || window.event;
            e.preventDefault();
            // get the mouse cursor position at startup:
            pos3 = e.clientX;
            pos4 = e.clientY;
            document.onmouseup = closeDragElement;
            // call a function whenever the cursor moves:
            document.onmousemove = elementDrag;
          }

          function elementDrag(e) {
            e = e || window.event;
            e.preventDefault();
            // calculate the new cursor position:
            pos1 = pos3 - e.clientX;
            pos2 = pos4 - e.clientY;
            pos3 = e.clientX;
            pos4 = e.clientY;
            
            let parentElement = elmnt.parentElement;
            if(elmnt.offsetTop < 0){elmnt.style.top = "0px"; return;}
            if(elmnt.offsetTop > (parentElement.offsetHeight - elmnt.offsetHeight))     {
                elmnt.style.top = (parentElement.offsetHeight - elmnt.offsetHeight) + "px"; 
                return;
              }
            if(elmnt.offsetLeft < 0){elmnt.style.left = "0px";return}
            if(elmnt.offsetLeft > (parentElement.offsetWidth - elmnt.offsetWidth)){
                elmnt.style.left = (parentElement.offsetWidth - elmnt.offsetWidth) + "px";
                return;
            }
            
            // set the element's new position:
            elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
            elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
          }

          function closeDragElement() {
            /* stop moving when mouse button is released:*/
            document.onmouseup = null;
            document.onmousemove = null;
          }
        }

function showCoords(event) {
  var x = event.clientX;
  var y = event.clientY;
  var coor = "X coords: " + x + ", Y coords: " + y;
  document.getElementById("demo").innerHTML = coor;
}

function clearCoor() {
  document.getElementById("demo").innerHTML = "";
}

        </script>


        </body>
        
</html>

タグを使用onmoveしましたが、機能しませんでした。

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