模拟搜索结果项

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。

<!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" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
    <title>模拟搜索结果项 - 豪情</title>
    <style type="text/css">
        *{ margin:0; padding:0;}
        body{font:12px/1.125 Arial,Helvetica,sans-serif;background:#fff;}
        table{border-collapse:collapse;border-spacing:0;}
        li{list-style:none;}
        fieldset,img{border:0;}
        article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}
        q:before,q:after{content:'';}
        a:focus,input,textarea{outline-style:none;}
        input[type="text"],input[type="password"],textarea{outline-style:none;-webkit-appearance:none;}
        textarea{resize:none}
        address,caption,cite,code,dfn,em,i,th,var{font-style:normal;font-weight:normal;}
        legend{color:#000;}
        abbr,acronym{border:0;font-variant:normal;}
        a{color:#333;text-decoration:none;}
        a:hover{text-decoration:underline;}
        .clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden;}
        .clearfix{display:inline-block;}
        .clearfix{display:block;}
        .clear{clear:both;height:0;font:0/0 Arial;visibility:hidden;}
        .none{display:none}
        .demo{ width:550px;margin:50px auto;}
        .input{width:543px; height:30px; line-height:30px; padding:3px 0 3px 5px; border:1px solid #ccc;background:#fff;}
        .demo .hover{ display:block;}
        .list{ border:1px solid #817f82;background:#fff; display:none;}
        .list li{width:548px; text-indent:1em;display:block; height:28px; line-height:28px;}
        .list li.cur{background:#ebebeb; text-decoration:none;}
    </style>
</head>
<body>
<div class="demo">
    <input class="input" type="text" name=""  />
    <ul >
        <li>豪情</li>
        <li>sina</li>
        <li>网易邮箱</li>
        <li>新浪微博</li>
        <li>腾讯微信</li>
    </ul>
</div>
<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>
</body>
</html>