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js一般方法改寫成面向?qū)ο蠓椒ǖ臒o限級(jí)折疊菜單示例代碼

更新時(shí)間：2013年07月04日 17:04:26 作者：

本例是應(yīng)用別人的例子，原來那位老兄是用一般方法寫成的無限級(jí)折疊菜單，通過了一些簡(jiǎn)化修改，將原來的例子改成了面向?qū)ο蟮姆绞?/div>

本例是應(yīng)用別人的例子，原來那位老兄是用一般方法寫成的無限級(jí)折疊菜單，在此先感謝他！后來我就通過了一些簡(jiǎn)化修改，將原來的例子改成了面向?qū)ο蟮姆绞剑瑢?shí)例中的展開與閉合的小圖標(biāo)可以自己重新添加，從而更好的查看效果。

復(fù)制代碼代碼如下:

 
<!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>很實(shí)用的JS+CSS多級(jí)樹形展開菜單</title> 
<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;} 
a{text-decoration: none;} 
#root{margin:10px;width:200px;overflow:hidden;} 
#root li{line-height:25px;} 
#root .rem{padding-left:16px;} 
#root .add{background:url(treeico.gif) -4px -31px no-repeat;} 
#root .ren{background:url(treeico.gif) -4px -7px no-repeat;} 
#root li a{color:#666666;padding-left:5px;outline:none;blr:expression(this.onFocus=this.blur());} 
#root .two{padding-left:20px;display:none;} 
</style> 
</head> 
<body> 
<ul id="root"> 
<li> 
<label><a href="javascript:;">校訊通</a></label> 
<ul class="two"> 
<li> 
<label><a href="javascript:;">沈陽市</a></label> 
<ul class="two"> 
<li> 
<label><a href="javascript:;">二小</a></label> 
<ul class="two"> 
<li><label><a href="javascript:;">二年級(jí)</a></label></li> 
<li> 
<label><a href="javascript:;">三年級(jí)</a></label> 
<ul class="two"> 
<li> 
<label><a href="javascript:;">一班</a></label> 
<ul class="two"> 
<li><label><a href="javascript:;">張三</a></label></li> 
<li> 
<label><a href="javascript:;">王五</a></label> 
<ul class="two"> 
<li><label><a href="javascript:;">班長(zhǎng)</a></label></li> 
<li><label><a href="javascript:;">學(xué)習(xí)委員</a></label></li> 
</ul> 
</li> 
</ul> 
</li> 
<li><label><a href="javascript:;">實(shí)驗(yàn)班</a></label></li> 
</ul> 
</li> 
</ul> 
</li> 
</ul> 
</li> 
<li> 
<label><a href="javascript:;">撫順市</a></label> 
<ul class="two"> 
<li><label><a href="javascript:;">二小</a></label></li> 
<li><label><a href="javascript:;">一中</a></label></li> 
</ul> 
</li> 
</ul> 
</li> 
</ul> 
<script type="text/javascript" > 
/**一般JS方法 
function addEvent(el,name,fn){//綁定事件 
if(el.addEventListener) return el.addEventListener(name,fn,false); 
return el.attachEvent('on'+name,fn); 
} 
function nextnode(node){//尋找下一個(gè)兄弟并剔除空的文本節(jié)點(diǎn) 
if(!node)return ; 
if(node.nodeType == 1) 
return node; 
if(node.nextSibling) 
return nextnode(node.nextSibling); 
} 
function prevnode(node){//尋找上一個(gè)兄弟并剔除空的文本節(jié)點(diǎn) 
if(!node)return ; 
if(node.nodeType == 1) 
return node; 
if(node.previousSibling) 
return prevnode(node.previousSibling); 
} 
addEvent(document.getElementById('root'),'click',function(e){//綁定點(diǎn)擊事件，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'://點(diǎn)擊A標(biāo)簽展開和收縮樹形目錄，并改變其樣式 
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'://點(diǎn)擊圖標(biāo)只展開或者收縮 
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; 
} 
}); 
window.onload = function(){//頁面加載時(shí)給有孩子結(jié)點(diǎn)的元素動(dòng)態(tài)添加圖標(biāo) 
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' 
} 
} 
**/ 
//面向?qū)ο蠓椒?
var Tree = function(o){ 
this.root = document.getElementById(o); 
this.labels = this.root.getElementsByTagName('label'); 
var that = this; 
this.int(); 
Tree.prototype.addEvent(this.root,'click',function(e){that.treeshow(e)}); 
} 
Tree.prototype = { 
int:function(){//初始化頁面，加載時(shí)給有孩子結(jié)點(diǎn)的元素動(dòng)態(tài)添加圖標(biāo) 
for(var i=0;i<this.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(this.nextnode(this.labels[i].nextSibling)&&this.nextnode(this.labels[i].nextSibling).nodeName == 'UL') 
this.labels[i].parentNode.insertBefore(span,this.labels[i]); 
else 
this.labels[i].className = 'rem' 
} 
}, 
treeshow:function(e){ 
e = e||window.event; 
var target = e.target||e.srcElement; 
var tp = this.nextnode(target.parentNode.nextSibling); 
switch(target.nodeName){ 
case 'A'://點(diǎn)擊A標(biāo)簽展開和收縮樹形目錄，并改變其樣式 
if(tp&&tp.nodeName == 'UL'){ 
if(tp.style.display != 'block' ){ 
tp.style.display = 'block'; 
this.prevnode(target.parentNode.previousSibling).className = 'ren' 
}else{ 
tp.style.display = 'none'; 
this.prevnode(target.parentNode.previousSibling).className = 'add' 
} 
} 
break; 
case 'SPAN'://點(diǎn)擊圖標(biāo)只展開或者收縮 
var ap = this.nextnode(this.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; 
} 
}, 
addEvent:function(el,name,fn){//綁定事件 
if(el.addEventListener) return el.addEventListener(name,fn,false); 
return el.attachEvent('on'+name,fn); 
}, 
nextnode:function(node){//尋找下一個(gè)兄弟并剔除空的文本節(jié)點(diǎn) 
if(!node)return ; 
if(node.nodeType == 1) 
return node; 
if(node.nextSibling) 
return this.nextnode(node.nextSibling); 
}, 
prevnode:function(node){//尋找上一個(gè)兄弟并剔除空的文本節(jié)點(diǎn) 
if(!node)return ; 
if(node.nodeType == 1) 
return node; 
if(node.previousSibling) 
return prevnode(node.previousSibling); 
} 
} 
tree = new Tree("root");//實(shí)例化應(yīng)用 
</script> 
</body> 
</html> 