js实现单元格上下拖动效果

2016-09-15 网页编程网 网页编程网

<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>s实现单元格上下拖动效果</title>
<script>
window.onload = function(){
//绑定事件
var addEvent = document.addEventListener ? function(el,type,callback){
  el.addEventListener( type, callback, !1 );
} : function(el,type,callback){
  el.attachEvent( "on" + type, callback );
}
//移除事件
var removeEvent = document.removeEventListener ? function(el,type,callback){
  el.removeEventListener( type, callback );
} : function(el,type,callback){
  el.detachEvent( "on" + type, callback);
}
//精确获取样式
var getStyle = document.defaultView ? function(el,style){
  return document.defaultView.getComputedStyle(el, null).getPropertyValue(style)
} : function(el,style){
  style = style.replace(/\-(\w)/g, function($, $1){
    return $1.toUpperCase();
  });
  return el.currentStyle[style];
}
var dragManager = {
  clientY:0,
  draging:function(e){//mousemove时拖动行
    var dragObj = dragManager.dragObj;
    if(dragObj){
      e = e || event;
      if(window.getSelection){//w3c
window.getSelection().removeAllRanges();
      }else  if(document.selection){
document.selection.empty();//IE
      }
      var y = e.clientY;
      var down = y > dragManager.clientY;//是否向下移动
      var tr = document.elementFromPoint(e.clientX,e.clientY);
      if(tr && tr.nodeName == "TD"){
tr = tr.parentNode
dragManager.clientY = y;
if( dragObj !== tr){
  tr.parentNode.insertBefore(dragObj, (down ? tr.nextSibling : tr));
}
      };
    }
  },
  dragStart:function(e){
    e = e || event;
    var target = e.target || e.srcElement;
    if(target.nodeName === "TD"){
      target = target.parentNode;
      dragManager.dragObj = target;
      if(!target.getAttribute("data-background")){
var background = getStyle(target,"background-color");
target.setAttribute("data-background",background)
      }
      //显示为可移动的状态
      target.style.backgroundColor = "#ccc";
      target.style.cursor = "move";
      dragManager.clientY = e.clientY;
      addEvent(document,"mousemove",dragManager.draging);
      addEvent(document,"mouseup",dragManager.dragEnd);
    }
  },
  dragEnd:function(e){
    var dragObj = dragManager.dragObj
    if (dragObj) {
      e = e || event;
      var target = e.target || e.srcElement;
      if(target.nodeName === "TD"){
target = target.parentNode;
dragObj.style.backgroundColor = dragObj.getAttribute("data-background");
dragObj.style.cursor = "default";
dragManager.dragObj = null;
removeEvent(document,"mousemove",dragManager.draging);
removeEvent(document,"mouseup",dragManager.dragEnd);
      }
    }
  },
  main:function(el){
    addEvent(el,"mousedown",dragManager.dragStart);
  }
}
var el = document.getElementById("net");
dragManager.main(el);
}
</script>
<style>
.net{
width:60%;
border: 1px solid red;
border-collapse: collapse;
}
.net td{
border: 1px solid red;
height: 20px;
}
</style>
</head>
<body>
    <table  id="net" class="net">
      <tbody>
        <tr>
          <td>1</td>
          <td>One</td>
          <td>以质量为核心，以实用为目的，打造国内一流网页特效站！</td>
        </tr>
        <tr id="2" >
          <td class="2">2</td>
          <td>Two</td>
          <td>以质量为核心，以实用为目的，打造国内一流网页特效站！</td>
        </tr>
        <tr id="3" >
          <td class="3">3</td>
          <td>Three</td>
          <td>以质量为核心，以实用为目的，打造国内一流网页特效站！</td>
        </tr>
        <tr id="4" >
          <td class="4">4</td>
          <td>Four</td>
          <td>以质量为核心，以实用为目的，打造国内一流网页特效站！</td>
        </tr>
        <tr id="5" >
          <td class="5">5</td>
          <td>Five</td>
          <td>以质量为核心，以实用为目的，打造国内一流网页特效站！</td>
        </tr>
        <tr id="6" >
          <td class="6">6</td>
          <td>Six</td>
          <td>以质量为核心，以实用为目的，打造国内一流网页特效站！</td>
        </tr>
      </tbody>
    </table>
  </body>
</html>

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