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javascript - 在另一个 div 中创建一个可拖动的 div

问题描述

我有一个由下面的代码设计的可拖动 div。现在我想把这个 div 放在另一个 div 中。我希望我的第一个 div 移动到第二个 div 内，而不是整个网页。我把<div> </div>我的代码放在任何地方，但没有看到我想要的。

代码是：

//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;
    // 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;
  }
}
#mydiv {
  position: absolute;
  z-index: 9;
  
  text-align: center;
  border: 1px solid #d3d3d3;
}

#mydivheader {
  padding: 10px;
  cursor: move;
  z-index: 10; 
}

@media print {
    body{
        width: 21cm;
        height: 29.7cm;
        margin: 0 0mm 0mm 0mm; 
        /* change the margins as you want them to be. */
   } 
}
<div id="mydiv">
  <div id="mydivheader">my text</div>
</div>

任何人都可以帮助我吗？;-)

标签： javascripthtmlcssdraggable

解决方案

为可拖动 div 添加父 div 并将其设置position为并为其设置并将可拖动 div 设置为. 还将目标设置为relativeoverflow:hiddenpositionabsolutedragElementmydivheader

<html>
<style>
#mydiv {
  position: absolute;
  z-index: 9;
  
  text-align: center;
  border: 1px solid #d3d3d3;
}

#mydivheader {
  padding: 10px;
  cursor: move;
  z-index: 10; 
  position: absolute;
}
  
  #dragParent {
    width: 300px;
    margin: auto;
    overflow: hidden;
    height: 200px;
    position: relative;
    border: 1px solid #e5e5e5;
  }

@media print {
    body{
        width: 21cm;
        height: 29.7cm;
        margin: 0 0mm 0mm 0mm; 
        /* change the margins as you want them to be. */
   } 
}
</style>
<body>

<div id="mydiv">
  <div id="dragParent">
  <div id="mydivheader">my text</div>
  </div>
</div>

<script>
//Make the DIV element draggagle:
dragElement(document.getElementById("mydivheader"));

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;
    // 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;
  }
}
</script>

</body>
</html>

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