实用的多级树形展开菜单

代码
<!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>实用的多级树形展开菜单</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<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 .add
{background:url(http://www.codefans.net/jscss/demoimg/201010/treeico.gif) -4px -31px no-repeat;}
#root .ren
{background:url(http://www.codefans.net/jscss/demoimg/201010/treeico.gif) -4px -7px no-repeat;}
#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>
<ul id="root">
    
<li>
        
<label><href="javascript:;">校讯通</a></label>
        
<ul class="two">
            
<li>
                
<label><href="javascript:;">沈阳市</a></label>
                
<ul class="two">
                    
<li>
                        
<label><input type="checkbox" value="123456"><href="javascript:;">二小</a></label>
                        
<ul class="two">
                            
<li><label><input type="checkbox" value="123456"><href="javascript:;">二年级</a></label></li>
                            
<li>
                                
<label><input type="checkbox" value="123456"><href="javascript:;">三年级</a></label>
                                
<ul class="two">
                                    
<li>
                                        
<label><input type="checkbox" value="123456"><href="javascript:;">一班</a></label>
                                        
<ul class="two">
                                            
<li><label><input type="checkbox" value="123456"><href="javascript:;">张三</a></label></li>
                                            
<li><label><input type="checkbox" value="123456"><href="javascript:;">王五</a></label></li>
                                        
</ul>
                                    
</li>
                                    
<li><label><input type="checkbox" value="123456"><href="javascript:;">实验班</a></label></li>
                                
</ul>
                            
</li>
                        
</ul>
                    
</li>
                
</ul>    
            
</li>
            
<li>
                
<label><href="javascript:;">抚顺市</a></label>
                
<ul class="two">
                    
<li><label><input type="checkbox" value="123456"><href="javascript:;">二小</a></label></li>
                    
<li><label><input type="checkbox" value="123456"><href="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);
    }
    
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)
            
return node;
        
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>
</body>
</html>


posted @ 2010-11-01 17:39  {前端开发}  阅读(1204)  评论(0编辑  收藏  举报