<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>既能实现下拉又能实现输入的文本框</title>
<script type="text/javascript">
function setSelToTxt(list,txtid){
var index = list.selectedIndex; //选中项的索引
var oTxt = document.getElementById(txtid); //获得文本框对象
oTxt.value = list.options[index].text;
}
</script>
</head>
<body>
<div style="margin-left:100px;">
<!--span必须绝对定位,否则下拉列表就会把它再拉回到左侧,即原来位置||overflow:hidden会隐藏掉下拉列表左侧的框(ie6中不用,ie8中需要,否则它不隐藏)-->
<span style="width:18px;margin-left:155px;position:absolute;overflow:hidden;"> <!--span主要控制让显示下拉列表的小三角形-->
<select name="username2" id="username2" style="width:173px;height:22px;margin-left:-155px;" onchange="setSelToTxt(this,'txt3')">
<option value="1">李雷</option>
<option value="2">陈磊</option>
<option value="3">韩美美</option>
</select>
</span>
<input type="text" name="txt3" id="txt3" style="position:absolute;"/><!--必须是绝对定位,否则在ie6中位置会出现偏差-->
</div>
</body>
</html>