<html>
<head>
<meta http-equiv="Content-Language" content="zh-cn">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>CheckBox</title>
<script language=javascript defer>
var n=document.getElementsByTagName("INPUT");
var CheckBoxNum=n.length;
var tf,SearchNodeName,SearchParentNodeName,SameNodeNum,SubNodeCheckedNum,SameNodeCheckedNum,SubNodeNum,SubNodeCheckedTF;function FindParentNode(SubNodeName) //获取上级结点名，并判断是否被选中
{
tf=false; //初始化选中状态
SearchNodeName=SubNodeName;
t=SubNodeName.lastIndexOf("_"); //判断是否存在上级结点
if(t!=-1)SearchNodeName=SubNodeName.substring(0,t);//如果存在上级结点，取得上级结点名
if(document.all(SubNodeName).checked)tf=true;//判断结点是否被选中
return SearchNodeName;
}
function CheckSubNode(NodeName) //获取结点名，并判断子结点是否选中
{
SubNodeCheckedTF=false; //初始化子结点选中状态
SubNodeNum=0; //初始化子结点数目
SameNodeNum=0; //初始化同级结点数目
SubNodeCheckedNum=0; //初始化子结点被选中的数目
SameNodeCheckedNum=0; //初始化同级结点被选中的数目
ParentNodeName=FindParentNode(NodeName);//上级结点名
SearchParentNodeName=NodeName;//当前结点名
d=NodeName.lastIndexOf("_"); //判断是否存在上级结点
if(d!=-1)SearchParentNodeName=SearchParentNodeName.substring(0,d);//如果存在上级结点，取得上级结点名
for(i=0;i<CheckBoxNum;i++)
{
if(n[i].name.length==NodeName.length&&ParentNodeName==FindParentNode(n[i].name))
{
SameNodeNum+=1; //同级结点数目加一
if(n[i].checked)SameNodeCheckedNum+=1;//同级结点被选中的数目加一
} if(n[i].name.substring(0,NodeName.length)==NodeName&&n[i].name!=NodeName&&n[i].type=="checkbox")
{
SubNodeNum+=1; //子结点数数目加一
if(n[i].checked)SubNodeCheckedNum+=1;//子结点被选中的数目加一
}
}
if((SameNodeNum==1
SameNodeCheckedNum==0)&&(SubNodeCheckedNum==0)&&!document.all(NodeName).checked)
{
SubNodeCheckedTF=true; //判断子结点是否被选中
}
return SearchParentNodeName;
}
function CheckAll(BoxName)
{
SearchNodeName=BoxName;
SearchParentNodeName=BoxName
SubNodeLength=BoxName.split("_").length; for(i=0;i<CheckBoxNum;i++)
{
if(n[i].name.substring(0,BoxName.length)==BoxName&&n[i].name!=BoxName&&n[i].type=="checkbox")
n[i].checked=document.all(BoxName).checked?true:false; //选中所有子结点
} for(j=1;j<SubNodeLength;j++)
{
document.all(FindParentNode(SearchNodeName)).checked=tf?true:false;
document.all(CheckSubNode(SearchParentNodeName)).checked=SubNodeCheckedTF?false:true;
} }
document.onclick=function(){if(event.srcElement.type=="checkbox")CheckAll(event.srcElement.name);}
</script>
</head><body >
<form name="f1" >
<input type="checkbox" name="bid"><br>
<input type="checkbox" name="bid_01"><br>
<input type="checkbox" name="bid_01_01"><br>
<input type="checkbox" name="bid_01_02"><br>
<input type="checkbox" name="bid_01_02_01"><br>
<input type="checkbox" name="bid_01_02_02"><br>
<input type="checkbox" name="bid_01_02_02_01"><br>
<input type="checkbox" name="bid_01_02_02_02"><br>
<input type="checkbox" name="bid_01_02_02_03"><br>
<input type="checkbox" name="bid_01_02_02_03_01"><br>
<input type="checkbox" name="bid_01_02_02_03_02"><br>
<input type="checkbox" name="bid_01_02_02_03_03"><br>
<input type="checkbox" name="bid_01_02_02_04"><br>
<input type="checkbox" name="bid_01_02_03"><br>
<input type="checkbox" name="bid_01_03"><br>
<input type="checkbox" name="bid_01_04"><br>
<input type="checkbox" name="bid_02"><br>
<input type="checkbox" name="bid_03"><br>
<input type="checkbox" name="bid_04"><br>
<hr>
<input type="checkbox" name="ent" checkmain ><br>
<input type="checkbox" name="ent_01"><br>
<input type="checkbox" name="ent_01_01"><br>
<input type="checkbox" name="ent_02"><br>
<input type="checkbox" name="ent_03"><br>
<input type="checkbox" name="ent_04"><br>
</form>
……