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Native js implementation of drop-down list box

韦小宝Original: 2017-11-17 14:53:393011browse

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Code:

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>PHP中文网--下拉框</title>
<style>
ul , h2 { padding:0; margin:0; }
li { list-style:none; }
#list { width:240px; border:1px solid #333; margin:0 auto; }
#list .lis {}
#list h2 { height:30px; line-height:30px; text-indent:20px; background:yellow; color:#000; }
#list .active { background:orange; color:#000; }
#list ul { display:none; }
#list ul li { line-height:24px; border-bottom:1px solid #333; text-indent:24px; }
#list ul .hover { background:pink; }
</style>
<script>
window.onload = function (){
	var oUl = document.getElementById(&#39;list&#39;);
	var aH2 = oUl.getElementsByTagName(&#39;h2&#39;);
	var aUl = oUl.getElementsByTagName(&#39;ul&#39;);
	var aLi = null;
	var arrLi = [];
	for(var i=0;i<aH2.length;i++){
		aH2[i].index=i;
		aH2[i].onclick = function(){
			for(var i=0;i<aH2.length;i++){
				if(aH2[i] !=this){
					aUl[i].style.display=&#39;none&#39;;
					aH2[i].className=&#39;&#39;;
				}
			}
			if(this.className==&#39;&#39;){
				aUl[this.index].style.display=&#39;block&#39;;
				this.className=&#39;active&#39;;
			}else{
				aUl[this.index].style.display=&#39;none&#39;;
				this.className=&#39;&#39;;
			}
		};
	}
	for(var i=0;i<aUl.length;i++){
		aLi = aUl[i].getElementsByTagName(&#39;li&#39;);
		for(var j=0;j<aLi.length;j++){
			arrLi.push(aLi[j]);
		}
	}
	for(var i=0;i<arrLi.length;i++){
		arrLi[i].onclick=function(){
			for(var i=0;i<arrLi.length;i++){
				if(arrLi[i] !=this){
					arrLi[i].className=&#39;&#39;;
				}
			}
			if(this.className==&#39;&#39;){
				this.className=&#39;hover&#39;;
			}else{
				this.className=&#39;&#39;;
			}
		};
	}
};
</script>
</head>

<body>

<ul id="list" style="margin-top:50px;">
	<li class="lis">
  	<h2>我的好友</h2>
    <ul>
    	<li>a111</li>
    	<li>a222</li>
    	<li>a333</li>
    	<li>a444</li>
    </ul>
  </li>
	<li class="lis">
  	<h2>陌生人</h2>
    <ul>
    	<li>b111</li>
    	<li>b222</li>
    	<li>b333</li>
    	<li>b444</li>
    	<li>b555</li>
    </ul>
  </li>
	<li class="lis">
  	<h2>黑名单</h2>
    <ul>
    	<li>c111</li>
    	<li>c222</li>
    </ul>
  </li>
</ul>

</body>
</html>

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