可调节列宽的JavaScript示例-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_5935/article/details/82443261
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>无标题文档</title>
<style type="text/css">
<!--
* {
 font-family: Verdana, Arial, Helvetica, sans-serif;
 font-size: 12px;
 color: #333333;
}
-->
</style>
</head>

<body>
<div>
<table id="dataTable" border="1" cellpadding="0" cellspacing="0" style="table-layout:fixed;border-collapse:collapse;">
 <colgroup>
  <col style="width:200px;" />
  <col style="width:100px;" />
  <col style="width:100px;" />
  <col style="width:100px;" />
  <col style="width:100px;" />
 </colgroup>
 <tr>
  <td>拖动我1</td>
  <td>拖动我2</td>
  <td>拖动我3</td>
  <td>拖动我4</td>
  <td>拖动我5</td>
 </tr>
 <tr>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
 </tr>
 <tr>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
 </tr>
 <tr>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
 </tr>
 <tr>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
 </tr>
 <tr>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
  <td> </td>
 </tr>
</table>
</div>
<script language="javascript" type="text/javascript">
var JPos = {};
(function($){

 $.getAbsPos = function(pTarget){
  var x_ = y_ = 0;

  if(pTarget.style.position != "absolute"){ 
   while(pTarget.offsetParent){
     x_ += pTarget.offsetLeft;
     y_ += pTarget.offsetTop;
     pTarget = pTarget.offsetParent;
   }
  }
   x_ += pTarget.offsetLeft;
   y_ += pTarget.offsetTop;
  return {x:x_,y:y_};
 }

 $.getEventPos = function(evt){
   var _x,_y;
   evt = JEvent.getEvent(evt);
   if(evt.pageX || evt.pageY){
    _x = evt.pageX;
    _y = evt.pageY;
   }else if(evt.clientX || evt.clientY){
    _x = evt.clientX + (document.body.scrollLeft || document.documentElement.scrollLeft) - (document.body.clientLeft || document.documentElement.clientLeft);
    _y = evt.clientY + (document.body.scrollTop || document.documentElement.scrollTop) - (document.body.clientTop || document.documentElement.clientTop);
   }else{
    return $.getAbsPos(evt.target);
   }
   return {x:_x,y:_y};
 }

})(JPos);

//=======================================================================================

var JEvent = {};
(function($){
 $.getEvent = function(evt){    
  evt = window.event || evt;

  if(!evt){
   var fun = JEvent.getEvent.caller;
   while(fun != null){
    evt = fun.arguments[0];
    if(evt && evt.constructor == Event)
     break;
    fun = fun.caller;
   }
  }

  return evt;
 }

 $.doEvent = function(fun){
  var args = arguments;
  return function(){
   return fun(args);
  }
 }
})(JEvent);
//=======================================================================================

var colIndex;
var dataTable = document.getElementById("dataTable");
var cols = dataTable.getElementsByTagName("COL");

var dragMask = document.createElement("DIV");
var mAWidth = mAHeight = 300;
document.body.insertBefore(dragMask,document.body.lastChild);
dragMask.style.cssText = "width:" + mAWidth + "px;height:" + mAHeight + "px;position:absolute;background-color:#000;filter: Alpha(Opacity=10);-moz-opacity:0.1;opacity: 0.1;display:none;z-index:999999999;display:none;";

var mask_mousemove = function(evt){
 if(document.selection){//IE ,Opera
  if(document.selection.empty)
   document.selection.empty();//IE
  else{//Opera
   document.selection = null;
  }
 }else if(window.getSelection){//FF,Safari
  window.getSelection().removeAllRanges();
 }

 var oPos = JPos.getAbsPos(this);
 var mPos = JPos.getEventPos(evt);

 var x = mPos.x - oPos.x - mAWidth / 2;
 var tmpX = parseInt(cols[colIndex].style.width) + x;
 dragMask.style.left = mPos.x - mAWidth / 2 + "px";
 cols[colIndex].style.width = tmpX >= 2 ? tmpX + "px" : "2px";
 if(!document.all)
  dataTable.parentNode.style.width = dataTable.parentNode.clientWidth + x + "px";//这一句为处理FF时用。
}

var mask_mouseup = function(evt){
 dragMask.style.display = "none";
}

dragMask.onmousemove = mask_mousemove;
dragMask.onmouseup = mask_mouseup;

var cell_mousedown = function(evt){
 colIndex = this.colIndex;
 var mPos = JPos.getEventPos(evt);
 with(dragMask.style){
  left = mPos.x - mAWidth / 2  + "px";
  top = mPos.y - mAHeight / 2 + "px";
  display = "";
 }
}

var chk_click = function(evt){
 var obj = cols[this.colIndex];
 if(this.checked){
  obj.style.cssText = obj.css_ ? obj.css_ : "width:100px;";
 }else{
  obj.css_ = obj.style.cssText;
  obj.style.cssText = document.all ? "display:none" : "visibility: collapse;overflow:hidden;width:0px;";
 }
}

var i , o;
var label ,chk;
for(i = 0 ; o = dataTable.rows[0].cells[i] ; i++){
 o.colIndex = i;
 o.onmousedown = cell_mousedown;

 label = document.createElement("LABEL");
 document.body.insertBefore(label,document.body.lastChild);
 chk = document.createElement("INPUT");
 chk.type = "checkbox";
 label.appendChild(chk);
 chk.onclick = chk_click;
 chk.colIndex = i;
 chk.checked = "checked";
 label.appendChild(document.createTextNode(o.innerHTML));
}
</script>
</body>
</html>