javascript 拖動(dòng)表格行實(shí)現(xiàn)代碼

更新時(shí)間：2011年05月05日 21:38:21 投稿：mdxy-dxy

用js實(shí)現(xiàn)的拖動(dòng)表格的tr行的實(shí)現(xiàn)代碼，需要的朋友可以參考下。

行拖動(dòng)的實(shí)現(xiàn)思路非常簡單，選中一行，往上拖就與上面的行交換位置，往下拖就與下面的行交換位置。問題是如何得到交換行。我見過一個(gè)非常詳細(xì)的教程，它會(huì)把表格里的每一行的高度與Y坐標(biāo)計(jì)算出來，換言之，都時(shí)是比較e.pageX是否在[rowTop,rowBottom]區(qū)間之內(nèi)。但這也帶來第二個(gè)問題，有多少行就有多個(gè)這樣的區(qū)間。于是解法就變成取事件源對(duì)象，然后再往上取其父對(duì)象，如果其父對(duì)象是TR元素，就取其[rowTop,rowBottom]區(qū)間....思路非常直接，同時(shí)也客觀做出一個(gè)限制——不能使用代理拖動(dòng)。先不談是拖動(dòng)代理還是拖動(dòng)實(shí)物，光是在移動(dòng)鼠標(biāo)的過程要做的計(jì)算量就非常大，幸好還在IE的承受范圍之內(nèi)。有更好的方法嗎？

人之所以先入為主，因?yàn)樗臀罩@么幾把鎖匙。如果他手上的鎖匙非常多時(shí)，他在開門時(shí)就會(huì)稍微停下來，認(rèn)真挑選了。因此熟悉掌握越多的原生API就越好，我們就才獲取更優(yōu)的選項(xiàng)。換一個(gè)思路，在拖動(dòng)時(shí)（mousedown）保存當(dāng)前行及其樣式與坐標(biāo)，拖動(dòng)中取得鼠標(biāo)所在位置上的元素，這個(gè)元素是使用一個(gè)巧妙的API取得document.elementFromPoint(x,y)。通常情況，我們?nèi)〉玫氖荰D，當(dāng)然如果你在里面塞進(jìn)一個(gè)DIV，那就是DIV羅。然后我們?cè)偃〉闷銽R元素，然后比較mousedown時(shí)保存的TR元素是不是同一個(gè)元素，不是同一個(gè)元素，我們才做進(jìn)一步的操作。這時(shí)我們就要判其是向上移向下移，簡單的減法而已。接著是交換兩行，使用insertBefore。最后當(dāng)mouseup時(shí)，還原行的樣式就是！由于沒有復(fù)雜的坐標(biāo)計(jì)算，整個(gè)程式出奇的高效！

完整演示代碼

<!doctype html>
<html>
 <head>
  <title>表格行拖動(dòng)</title>
  <script>
     window.onload = function(){
    //綁定事件
    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);
    }
    //精確獲取樣式
    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時(shí)拖動(dòng)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;//是否向下移動(dòng)
       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)
       }
       //顯示為可移動(dòng)的狀態(tài)
       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("table");
    dragManager.main(el);
   }
   
  </script>
  <style>
   .table{
    width:60%;
    border: 1px solid red;
    border-collapse: collapse;
   }
   .table td{
    border: 1px solid red;
    height: 20px;
   }
  </style>
 </head>
 <body>
  <h1>表格行拖動(dòng)</h1>
  <table id="table" class="table">
   <tbody>
    <tr>
     <td>1</td>
     <td>One</td>
     <td>dom.require</td>
    </tr>
    <tr id="2" >
     <td class="2">2</td>
     <td>Two</td>
     <td>ControlJS </td>
    </tr>
    <tr id="3" >
     <td class="3">3</td>
     <td>Three</td>
     <td>HeadJS</td>
    </tr>
    <tr id="4" >
     <td class="4">4</td>
     <td>Four</td>
     <td>LAB.js</td>
    </tr>
    <tr id="5" >
     <td class="5">5</td>
     <td>Five</td>
     <td>$script.js</td>
    </tr>
    <tr id="6" >
     <td class="6">6</td>
     <td>Six</td>
     <td>NBL.js</td>
    </tr>
   </tbody>
  </table>
 </body>
</html>

核心代碼

 window.onload = function(){
 //綁定事件
 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);
 }
 //精確獲取樣式
 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時(shí)拖動(dòng)行
   var dragObj = dragManager.dragObj;
   if(dragObj){
    e = e || event;//清除選區(qū)
    if(window.getSelection){//w3c
     window.getSelection().removeAllRanges();
    }else if(document.selection){
     document.selection.empty();//IE
    }
    var y = e.clientY;
    var down = y > dragManager.clientY;//是否向下移動(dòng)
    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)
    }
    //顯示為可移動(dòng)的狀態(tài)
    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("table");
 dragManager.main(el);
}

實(shí)現(xiàn)代碼二

<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head > 
<title>無標(biāo)題頁</title> 
</head> 
<body> 
<table id="tb1" border="1" cellpadding="3"> 
<tr> 
<th>移動(dòng)</th> 
<th>數(shù)據(jù)</th> 
<th>數(shù)據(jù)</th> 
<th>數(shù)據(jù)</th> 
</tr> 
<tr> 
<td>*</td> 
<td>11111111111</td> 
<td>sdgergserhserhserh</td> 
<td>awegaw</td> 
</tr> 
<tr> 
<td>*</td> 
<td>222222222</td> 
<td>serherwwwwww</td> 
<td>fafafff</td> 
</tr> 
<tr> 
<td>*</td> 
<td>333333333</td> 
<td>qqqqqqqwewer</td> 
<td>yukyuk</td> 
</tr> 
</table> 
<script type="text/javascript"> 
var curTr = null; 
var tb1 = document.getElementById('tb1'); 
var trs = tb1.getElementsByTagName('tr'); 
tb1.onselectstart = function(){ 
if(curTr){ 
document.selection.empty(); return true; 
} 
}; 
for(var i=1; i<trs.length; i++) { 
var tds = trs[i].getElementsByTagName('td'); 
tds[0].style.cursor = 'move'; 
tds[0].onmousedown = function(){ 
curTr = this.parentNode; 
curTr.style.backgroundColor = '#eff'; 
}; 
tds[0].onmouseover = function() { 
if(curTr && curTr != this.parentNode) { 
this.parentNode.swapNode(curTr); 
} 
} 
} 
document.body.onmouseup = function(){ 
if(curTr){ 
curTr.style.backgroundColor = ''; 
curTr = null; 
} 
}; 
</script> 
</body> 
</html>

注：不兼容firefox，在IE和chrome下測(cè)試通過哦。

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