<!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>无标题文档</title>
</head>
<body>
<form action="" method="get">
<select name="" id="sheng">
<option>选择省</option>
</select>
<select name="" id="diqu">
<option>选择地区</option>
</select>
</form>
var region = ['全国',['北京市','西城区','东城区','朝阳区'],['上海市','虹桥区','闸北区','浦东区'],
['河北省','石家庄市','沧州市','廊坊市']];
window.onload = function(){
var sels = document.getElementById("sheng");
var seld = document.getElementById("diqu");
function init(){
for(var i=1;i<region.length;i++){
var opt = document.createElement("option");
var txt = document.createTextNode(region[i][0]);
opt.appendChild(txt);
sels.appendChild(opt);
}
}
function onChange(){
var aRemove = seld.getElementsByTagName("option");
for(var j = aRemove.length - 1;j>0;j--){
seld.removeChild(aRemove[j]);
}
if(this.selectedIndex){
for(var i =1;i<region[this.selectedIndex].length;i++){
var opt = document.createElement("option");
var txt = document.createTextNode(region[this.selectedIndex][i]);
opt.appendChild(txt);
seld.appendChild(opt);
}
}
}
init();
sels.onchange = onChange;
}
</script>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<form action="" method="get">
<select name="" id="sheng">
<option>选择省</option>
</select>
<select name="" id="diqu">
<option>选择地区</option>
</select>
</form>
<!--JavaScript代码-->
var region = ['全国',['北京市','西城区','东城区','朝阳区'],['上海市','虹桥区','闸北区','浦东区'],
['河北省','石家庄市','沧州市','廊坊市']];
window.onload = function(){
var sels = document.getElementById("sheng");
var seld = document.getElementById("diqu");
function init(){
for(var i=1;i<region.length;i++){
var opt = document.createElement("option");
var txt = document.createTextNode(region[i][0]);
opt.appendChild(txt);
sels.appendChild(opt);
}
}
function onChange(){
var aRemove = seld.getElementsByTagName("option");
for(var j = aRemove.length - 1;j>0;j--){
seld.removeChild(aRemove[j]);
}
if(this.selectedIndex){
for(var i =1;i<region[this.selectedIndex].length;i++){
var opt = document.createElement("option");
var txt = document.createTextNode(region[this.selectedIndex][i]);
opt.appendChild(txt);
seld.appendChild(opt);
}
}
}
init();
sels.onchange = onChange;
}
</script>
</body>
</html>
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