花了几小时整理了一下代码,怎样用js实现鼠标选择和键盘操作下拉菜单,非常经典的案例实战。js实现在鼠标经过时,改变字体的颜色和背景,然后下拉菜单显示。一般情况下,下拉菜单处于隐藏的状态。
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>下拉菜单</title> <style type="text/css"> body,ul,li{ margin:0; padding:0; font-size:13px;} ul,li{list-style:none;} #pselect{width:186px; margin:80px auto; position:relative; z-index:10000;} #pselect cite{width:150px; height:24px;line-height:24px; display:block; color:#807a62; cursor:pointer;font-style:normal; padding-left:4px; padding-right:30px; border:1px solid #333333; background:url(xjt.png) no-repeat right center;} #pselect ul{width:184px;border:1px solid #333333; background-color:#ffffff; position:absolute; z-index:20000; margin-top:-1px; display:none;} #pselect ul li{height:24px; line-height:24px;} #pselect ul li a{display:block; height:24px; color:#333333; text-decoration:none; padding-left:10px; padding-right:10px;} </style> <script type="text/javascript"> window.onload=function(){ var box=document.getElementById('pselect'), title=box.getElementsByTagName('cite')[0], menu=box.getElementsByTagName('ul')[0], as=box.getElementsByTagName('a'), index=-1; // 点击三角时 // 执行脚本 //显示选项面板 title.onclick=function(event){ event = event || window.event;//控制浏览器兼容 //取消冒泡事件 if(event.stopPropagation){//非ie event.stopPropagation(); }else{ event.cancleBubble = true;//ie } menu.style.display = "block"; document.onkeydown = function(e){ e = e || window.event; if(e.keyCode == 38){//下键 index++; if(index == as.length){ index = 0; } resetAs(); as[index].style.background = "#567"; }else if(e.keyCode == 40){//上键 index--; if(index<0){ index = as.length - 1; } resetAs(); as[index].style.background = "#567"; }else if(e.keyCode == 13){ //enter键 e.preventDefault?e.preventDefault():e.returnValue = false; title.innerHTML = as[index].innerHTML; index = -1; menu.style.display = "none"; resetAs(); } } } /*重置所有选项的背景*/ function resetAs(){ for(var i = 0,l = as.length;i<l;i++){ as[i].style.background = "#FFF"; } } // 滑过滑过、离开、点击每个选项时 // 执行脚本 for(var i = 0;i<as.length;i++){ as[i].onmouseover = function(){ this.style.background = "#567"; }; as[i].onmouseout = function(){ this.style.background = "#FFF"; }; as[i].onclick = function(event){ //取消冒泡事件 if(event.stopPropagation){//非ie event.stopPropagation(); }else{ event.cancleBubble = true;//ie } title.innerHTML = this.innerHTML; menu.style.display = "none"; } } // 点击页面空白处时 隐藏选项面板 // 执行脚本 document.onclick = function(){ menu.style.display = "none"; } } </script> </head> <body> <p id="pselect"> <cite>请选择分类</cite> <ul> <li id="li"><a href="javascript:;" selectid="1">ASP开发</a></li> <li><a href="javascript:;" selectid="2">.NET开发</a></li> <li><a href="javascript:;" selectid="3">PHP开发</a></li> <li><a href="javascript:;" selectid="4">Javascript开发</a></li> <li><a href="javascript:;" selectid="5">Java特效</a></li> </ul> </p> </body> </html>
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