<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>省市二级联动</title>
</head>
<body>
<script type="text/javascript" src="jquery/jquery-1.4.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(#province).change(function(){
$(#city).load(show.php?id=+$(#province).val());
});
});
</script>
<span>省市二级联动</span><br/>
<select name="province" id="province">
<option value="-1">请选择省份</option>
<?php
$conn = mysql_connect("localhost","root","root"); //连接数据库
mysql_query("set names utf8");
mysql_select_db("bbs");
$rs = mysql_query("select id,cname,parentid from areas where parentid='0'");
while($row = mysql_fetch_array($rs))
{
?>
<option value="<?php echo $row['id']?>><?php echo $row['cname']?></option>
<?php
}
?>
</select>
<span id="city">
<select name="city1" id="city1">
<option value='-2'>请选择城市</option>
</select>
</span>
</body>
</html>
show.php
<?php
header("content-type:text/html;charset=utf-8");
$province_id = $_get['id'];
if($province_id=='10000000' || $province_id=='11000000' || $province_id=='18000000' || $province_id=='31000000')
{
//直辖市
$sql = "select id,cname from areas where id='{$province_id}'";
}
else
{
$sql = "select id,cname from areas where parentid={$province_id}";
}
$conn = mysql_connect("localhost","root","root"); //连接数据库
mysql_query("set names utf8");
mysql_select_db("bbs");
$rs = mysql_query($sql);
$show = "<select name='city1' id='city1'>;
while($row = mysql_fetch_array($rs))
{
$show .= <option value=".$row['id'].">.$row['cname'].</option>;
}
$show .= </select>;
if($province_id=='-1') //选中”请选择省份“时，城市列表显示请选择城市
{
$show=<select><option>请选择城市</option></select>;
}
echo $show; //返回字符串显示到页面
?>