js单元格拖拽 js实现单元格拖拽效果

时间:2021-04-21 我只是一个小前端02 人气:0
<head>
 <meta charset="UTF-8">
 <title></title>
 <style type="text/css">
 * {
  margin: 0;
  padding: 0;
 }
 
 #box {
  position: relative;
 }
 
 #box div {
  position: absolute;
  width: 100px;
  height: 100px;
  border-radius: 15px;
  text-align: center;
  line-height: 100px;
  font-size: 50px;
  cursor: pointer;
 }
 </style>
</head>

<body>
 <div id="box"></div>
 <script type="text/javascript">
 //生成结构
 var oDiv = document.getElementById("box");
 var ml = mt = 10;
 //行列结构
 for(var i = 0; i < 3; i++) { //行
  for(var j = 0; j < 3; j++) { //列
  var aDiv = document.createElement("div");
  oDiv.appendChild(aDiv);
  aDiv.style.left = j * (aDiv.offsetWidth + ml) + "px";
  aDiv.style.top = i * (aDiv.offsetHeight + mt) + "px";

  //背景颜色随机
  aDiv.style.backgroundColor = "rgb(" + Math.floor(Math.random() * 256) + "," + Math.floor(Math.random() * 256) + "," + Math.floor(Math.random() * 256) + ")"; //256=(256-0+1)+0;
  }
 }
 //添加文字
 var str = "ABCDEFGHI";
 var aItems = oDiv.children;
 for(var i = 0; i < str.length; i++) {
  aItems[i].innerText = str[i];
 }
 //拖拽
 for(var i = 0; i < aItems.length; i++) {
  aItems[i].onmousedown = function(e) {
  var evt = e || event;
  var x = evt.offsetX;
  var y = evt.offsetX;
  var dragNode = this;

  var cloneNode = dragNode.cloneNode();
  oDiv.replaceChild(cloneNode, dragNode);
  cloneNode.style.border = "1px dashed #ccc";
  oDiv.appendChild(dragNode);
  dragNode.style.zIndex = 1;

  document.onmousemove = function(e) {
   var evt = e || event;
   var _left = evt.clientX - x;
   var _top = evt.clientY - y;

   dragNode.style.left = _left + "px";
   dragNode.style.top = _top + "px";

   return false; //选中,文字也会拖动 去除默认行为
  }
  document.onmouseup = function() {
   var disArr =[];
   var newArr =[];
   for(var i = 0; i < aItems.length-1; i++) {
   var disx = dragNode.offsetLeft - aItems[i].offsetLeft;
   var disy = dragNode.offsetTop - aItems[i].offsetTop;
   var dis= Math.sqrt(Math.pow(disx, 2) + Math.pow(disy, 2));
    disArr.push(dis);
   newArr.push(dis);
   }

   disArr.sort(function(a, b) {
   return a - b;
   });
   var minval = disArr[0];
   
   var minIndex = newArr.indexOf(minval);

   dragNode.style.left = aItems[minIndex].style.left;
   dragNode.style.top = aItems[minIndex].style.top;
   aItems[minIndex].style.left = cloneNode.style.left;
   aItems[minIndex].style.top = cloneNode.style.top;
   
   oDiv.removeChild(cloneNode);
   
   document.onmousemove = null;
   document.onmouseup = null;

  }
  return false;
  }
 }
 </script>
</body>
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