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要求：
1. 点击input框显示下拉列表。
2. 选中下拉列表值后关闭列表。
3. 方向键可选列表中的项。
<br /> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br /> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><br /> <head><br /> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><br /> <title>模拟搜索结果项 - 豪情</title><br /> <style type="text/css"><br /> *{ margin:0; padding:0;}<br /> body{font:12px/1.125 Arial,Helvetica,sans-serif;background:#fff;}<br /> table{border-collapse:collapse;border-spacing:0;}<br /> li{list-style:none;}<br /> fieldset,img{border:0;}<br /> article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}<br /> q:before,q:after{content:'';}<br /> a:focus,input,textarea{outline-style:none;}<br /> input[type="text"],input[type="password"],textarea{outline-style:none;-webkit-appearance:none;}<br /> textarea{resize:none}<br /> address,caption,cite,code,dfn,em,i,th,var{font-style:normal;font-weight:normal;}<br /> legend{color:#000;}<br /> abbr,acronym{border:0;font-variant:normal;}<br /> a{color:#333;text-decoration:none;}<br /> a:hover{text-decoration:underline;}<br /> .clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden;}<br /> .clearfix{display:inline-block;}<br /> .clearfix{display:block;}<br /> .clear{clear:both;height:0;font:0/0 Arial;visibility:hidden;}<br /> .none{display:none}<br /> .demo{ width:550px;margin:50px auto;}<br /> .input{width:543px; height:30px; line-height:30px; padding:3px 0 3px 5px; border:1px solid #ccc;background:#fff;}<br /> .demo .hover{ display:block;}<br /> .list{ border:1px solid #817f82;background:#fff; display:none;}<br /> .list li{width:548px; text-indent:1em;display:block; height:28px; line-height:28px;}<br /> .list li.cur{background:#ebebeb; text-decoration:none;}<br /> </style><br /> </head><br /> <body><br /> <div class="demo"><br /> <input class="input" type="text" name="" id="input" /><br /> <ul id="list" class="list"><br /> <li>豪情</li><br /> <li>sina</li><br /> <li>网易邮箱</li><br /> <li>新浪微博</li><br /> <li>腾讯微信</li><br /> </ul><br /> </div><br /> <script type="text/javascript"> function id(){ return document.getElementById(arguments[0]); } (function(window){ var input = id('input'), list = id('list'), oA = list.getElementsByTagName('li'); // show list input.onclick = function(){ var items = null; list.className = 'list hover'; // set first current css for(var i = 0; i < oA.length; i++){ items = oA[i]; if(input.value && items.innerHTML == input.value){ items.className = 'cur'; } } } // set first input val input.value = oA[0].innerHTML; // hide list document.documentElement.onclick = function(e){ e = e ? e.target : window.event.srcElement; if(e.tagName.toLowerCase() == 'body' || e.tagName.toLowerCase() == 'html'){ list.className = 'list'; } } var oLi = null; for(var i = 0; i < oA.length; i++){ oLi = oA[i]; // click hide list and set input val oLi.onclick = function(){ list.className = 'list'; input.value = this.innerHTML; } oLi.onmouseover = function(){ // clear all selected css for(var j = 0; j < oA.length; j++){ oA[j].className = ''; } this.className = 'cur'; } oLi.onmouseout = function(){ this.className = ''; } } // keyboard trigger document.documentElement.onkeydown = function(e){ e = e || window.event; var target = e.target || e.srcElement, kcode = 0, index = getItems() || 0; if(target.tagName.toLowerCase() == 'input' && list.className == 'list hover'){ kcode = e.keyCode; switch(kcode){ case 13 : // enter list.className = 'list'; break; case 37 : // left case 38 : // up /* if(index > 0){ // if min hover(oA[index - 1]); } else { hover(oA[oA.length - 1]); } */ hover(oA[index > 0 ? index - 1 : oA.length - 1]); break; case 39 : // right case 40 : // down /* if(index < oA.length - 1){ // if max hover(oA[index + 1]); } else { hover(oA[0]); } */ hover(oA[index > 0 ? index + 1 : 0]); break; } } } // get current index function getItems(){ for(var i = 0; i < oA.length; i++){ if(oA[i].className == 'cur'){ return i; } } } // set hover class function hover(obj){ for(var i = 0; i < oA.length; i++){ oA[i].className = ''; } obj.className = 'cur'; input.value = obj.innerHTML; } }(window)); </script><br /> </body><br /> </html><br />
运行代码
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