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<!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>
<title>实用的多级树级菜单</title>
<FCK:meta http-equiv="content-type" content="text/html;charset=gb2312" />
<!--把下面代码加到<head>与</head>之间-->
<style type="text/css">
body{margin:0;padding:0;font:12px/1.5 Tahoma,Helvetica,Arial,sans-serif;}
ul,li,{margin:0;padding:0;}
ul{list-style:none;}
#root{margin:10px;width:200px;overflow:hidden;}
#root li{line-height:25px;}
#root .rem{padding-left:16px;}
#root li a{color:#666666;padding-left:5px;outline:none;blr:expression(this.onFocus=this.blur());}
#root li input{vertical-align:middle;margin-left:5px;}
#root .two{padding-left:20px;display:none;}
</style>
</head>
<body>
<!--把下面代码加到<body>与</body>之间-->
<ul id="root">
<li>
<label><a href="javascript:;" _fcksavedurl="javascript:;">校讯通</a></label>
<ul class="two">
<li>
<label><a href="javascript:;" _fcksavedurl="javascript:;">沈阳市</a></label>
<ul class="two">
<li>
<label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">二小</a></label>
<ul class="two">
<li><label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">二年级</a></label></li>
<li>
<label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">三年级</a></label>
<ul class="two">
<li>
<label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">一班</a></label>
<ul class="two">
<li><label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">张三</a></label></li>
<li><label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">王五</a></label></li>
</ul>
</li>
<li><label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">实验班</a></label></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li>
<label><a href="javascript:;" _fcksavedurl="javascript:;">抚顺市</a></label>
<ul class="two">
<li><label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">二小</a></label></li>
<li><label><input type="checkbox" value="123456"><a href="javascript:;" _fcksavedurl="javascript:;">一中</a></label></li>
</ul>
</li>
</ul>
</li>
</ul>
<script type="text/javascript" >
function addEvent(el,name,fn){//绑定事件
if(el.addEventListener) return el.addEventListener(name,fn,false);
return el.attachEvent(‘on‘+name,fn);
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function nextnode(node){//寻找下一个兄弟并剔除空的文本节点
if(!node)return ;
if(node.nodeType == 1)
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if(node.nextSibling)
return nextnode(node.nextSibling);
}
function prevnode(node){//寻找上一个兄弟并剔除空的文本节点
if(!node)return ;
if(node.nodeType == 1)
return node;
if(node.previousSibling)
return prevnode(node.previousSibling);
}
function parcheck(self,checked){//递归寻找父亲元素，并找到input元素进行操作
var par = prevnode(self.parentNode.parentNode.parentNode.previousSibling),parspar;
if(par&&par.getElementsByTagName(‘input‘)[0]){
par.getElementsByTagName(‘input‘)[0].checked = checked;
parcheck(par.getElementsByTagName(‘input‘)[0],sibcheck(par.getElementsByTagName(‘input‘)[0]));
}
}
function sibcheck(self){//判断兄弟节点是否已经全部选中
var sbi = self.parentNode.parentNode.parentNode.childNodes,n=0;
for(var i=0;i<sbi.length;i++){
if(sbi[i].nodeType != 1)//由于孩子结点中包括空的文本节点，所以这里累计长度的时候也要算上去
n++;
else if(sbi[i].getElementsByTagName(‘input‘)[0].checked)
n++;
}
return n==sbi.length?true:false;
}
addEvent(document.getElementById(‘root‘),‘click‘,function(e){//绑定input点击事件，使用root根元素代理
e = e||window.event;
var target = e.target||e.srcElement;
var tp = nextnode(target.parentNode.nextSibling);
switch(target.nodeName){
case ‘A‘://点击A标签展开和收缩树形目录，并改变其样式会选中checkbox
if(tp&&tp.nodeName == ‘UL‘){
if(tp.style.display != ‘block‘ ){
tp.style.display = ‘block‘;
prevnode(target.parentNode.previousSibling).className = ‘ren‘
}else{
tp.style.display = ‘none‘;
prevnode(target.parentNode.previousSibling).className = ‘add‘
}
}
break;
case ‘SPAN‘://点击图标只展开或者收缩
var ap = nextnode(nextnode(target.nextSibling).nextSibling);
if(ap.style.display != ‘block‘ ){
ap.style.display = ‘block‘;
target.className = ‘ren‘
}else{
ap.style.display = ‘none‘;
target.className = ‘add‘
}
break;
case ‘INPUT‘://点击checkbox，父亲元素选中，则孩子节点中的checkbox也同时选中，孩子结点取消父元素随之取消
if(target.checked){
if(tp){
var checkbox = tp.getElementsByTagName(‘input‘);
for(var i=0;i<checkbox.length;i++)
checkbox[i].checked = true;
}
}else{
if(tp){
var checkbox = tp.getElementsByTagName(‘input‘);
for(var i=0;i<checkbox.length;i++)
checkbox[i].checked = false;
}
}
parcheck(target,sibcheck(target));//当孩子结点取消选中的时候调用该方法递归其父节点的checkbox逐一取消选中
break;
}
});
window.onload = function(){//页面加载时给有孩子结点的元素动态添加图标
var labels = document.getElementById(‘root‘).getElementsByTagName(‘label‘);
for(var i=0;i<labels.length;i++){
var span = document.createElement(‘span‘);
span.style.cssText =‘display:inline-block;height:18px;vertical-align:middle;width:16px;cursor:pointer;‘;
span.innerHTML = ‘ ‘
span.className = ‘add‘;
if(nextnode(labels[i].nextSibling)&&nextnode(labels[i].nextSibling).nodeName == ‘UL‘)
labels[i].parentNode.insertBefore(span,labels[i]);
else
labels[i].className = ‘rem‘
}
}
</script>
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原文地址：http://www.cnblogs.com/zhaoguangxing/p/4445225.html
