复选下拉菜单
<!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>
<title></title>
<style type="text/css">
#selectCity
{
height: 28px;
width: 172px;
}
#selectArea
{
height: 28px;
width: 167px;
}
</style>
<script language="javascript" type="text/javascript">
function selectValue() {
var s = document.getElementById("selectCity");
var selectValue = s.options[s.selectedIndex].value;
var aarea;
switch (selectValue) {
case "成都":
sarea = new Array("锦江区", "青羊区", "金牛区", "武侯区", "成华区", "高新区");
break;
case "重庆":
sarea = new Array("渝中区", "沙坪坝", "渝北区", "九龙坡区", "大渡口区", "巴南区");
break;
default:
break;
}
var areaDom = document.getElementById("selectArea");
if (selectValue != "0") {
areaDom.options.length = 0;
for (var i = 0; i < sarea.length; i++) {
var domoption = document.createElement("option");
var domtext = document.createTextNode(sarea[i]);
domoption.appendChild(domtext);
areaDom.appendChild(domoption);
}
}
else {
if (areaDom.options[0].value != "1") {
areaDom.options.length = 0;
var a = document.createElement("option");
var atext = document.createTextNode("--请选择所在的地区--");
a.setAttribute("value", "1");
a.appendChild(atext);
areaDom.appendChild(a);
}
}
}
</script>
</head>
<body>
请选择你在的城市：<select id="selectCity" onchange="selectValue();">
<option value="0">--请选择所在的城市--</option>
<option value="成都">成都</option>
<option value="重庆">重庆</option>
</select>
所在的地区：<select id="selectArea">
<option value="1">--请选择所在的地区--</option>
</select>
</body>
</html>
