<script type="text/javascript">
//当第一级选项发生变化的时候跳转
function jump() {
location.href=http://www.mamicode.com/‘?firstid=‘+document.getElementById(‘first‘).value;"">---请选择---</option>
<?php
$sql=‘select * from shoplist where parentid=0‘;
$rs=mysql_query($sql);
while($rows=mysql_fetch_assoc($rs)):
?>
<option value="http://www.mamicode.com/<?php echo $rows[‘id‘]?>" <?php echo $rows[‘id‘]==$firstid?‘selected‘:‘‘?>><?php echo $rows[‘name‘]?></option>
<?php
endwhile;
?>
</select>
<!--获取第二级-->
<select id=‘second‘>
<option value="">---请选择---</option>
<?php
$sql="select * from shoplist where parentid=$firstid";
$rs=mysql_query($sql);
while($rows=mysql_fetch_assoc($rs)): 
?>
<option value="http://www.mamicode.com/<?php echo $rows[‘id‘]?>"><?php echo $rows[‘name‘]?></option>
<?php endwhile;	?>
</select>