按方向键后能在多个下拉选项中自由选择某个选项值，然后把选中的值写入光标所在的文本框位置。
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<title>通过方向键来选择项目_武鸣人</title>
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#divSelect{border:1px solid red;width:208px !important;width:210px;}
#divSelect ul{width:200px;margin:3px;margin-left:-35px;*margin-left:3px;overflow:hidden;}
#divSelect ul li{float:left;list-style-type:none;width:45px;height:14px;line-height:20px;font:14px arial;text-align:center;padding:2px;}
#divSelect li:hover{background:green;cursor:pointer;}
#www_wuming_ren{width:205px;}
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<a href="https://www.wuming.ren">武鸣人</a>，各种信息资源免费发布，分享励志语录经典短句，减肥健身常识，各种js特效代码。网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)<hr>
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<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
点下下面的文本框然后按方向键<br />
<form method="post" action="##">
<input type="text" id="www_wuming_ren" value="" autocomplete="off" onkeydown="if(event.keyCode==13)return false;">
<!--
防止回车键触发表单提交
onKeyPress
-->
<div id="divSelect"></div>
<script type="text/javascript">
var list="<ul>"
list+="<li>wuming</li><li>战争片</li><li>动作片</li><li>爱情片</li><li>剧情片</li><li>记录片</li><li>fbac</li><li>bbca</li><li>defe</li><li>gzza</li><li>恐怖片</li><li>古装片</li><li>电视剧</li><li>读书</li><li >小说</li><li>作品集</li><li>历史</li><li>诗歌</li><li >散文</li><li>军事</li>";
list+="</ul>"
document.getElementById('divSelect').innerHTML=list;
</script>
</form>
<script type="text/javascript">
<!--
function $(sId)
{
return document.getElementById(sId);
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function clearSelectedOptBgColor(target)
{
if (target.seletedIndex >= 0)
target.options[target.seletedIndex].style.background = "";
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function setSelectedOptBgColor(target)
{
target.options[target.seletedIndex].style.background = "green";
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
var upKeyCode = 38;
var downKeyCode = 40;
var enterKeyCode = 13;
var oInput = $("www_wuming_ren");
oInput.options = $("divSelect").getElementsByTagName("li");
oInput.seletedIndex = -1;
oInput.focus();
//oInput.onKeyPress{}
oInput.onkeyup = function(event){
if (event == undefined)
event = window.event;
switch (event.keyCode)
{
case 37:
clearSelectedOptBgColor(this);
this.seletedIndex--;
if (this.seletedIndex < 0)
this.seletedIndex = this.options.length - 1;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case 38:
clearSelectedOptBgColor(this);
this.seletedIndex= this.seletedIndex-4;
if (this.seletedIndex < 0)
this.seletedIndex = this.options.length - 1;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case 39:
clearSelectedOptBgColor(this);
this.seletedIndex++;
if (this.seletedIndex >= this.options.length)
this.seletedIndex = 0;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case 40:
clearSelectedOptBgColor(this);
this.seletedIndex= this.seletedIndex+4;
if (this.seletedIndex >= this.options.length)
this.seletedIndex = 0;
this.value = this.options[this.seletedIndex].innerHTML;
setSelectedOptBgColor(this);
break;
case enterKeyCode:
this.value = this.options[this.seletedIndex].innerHTML;
//alert('aa')
break;
}
};
oInput.onblur = function(){
clearSelectedOptBgColor(this);
this.seletedIndex = 1;
};//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//-->
</script>
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