html+js:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>城市联动示例</title>
</head>
<body>
<select name="province" id="province" onchange="loadRegion('province',2,'city','{:U('Index/getRegion')}');">
<option value="0" selected>省份/直辖市</option><volist name="province" id="vo">
<option value="{$vo.id}" >{$vo.name}</option></volist>
</select>
<select name="city" id="city" onchange="loadRegion('city',3,'town','{:U('Index/getRegion')}');">
<option value="0">市/县</option>
</select>
<select name="town" id="town">
<option value="0">镇/区</option>
</select>
</body>
<script type="text/javascript" src="__PUBLIC__/js/jquery-1.8.0.min.js"></script>
<script>
function loadRegion(sel,type_id,selName,url){
jQuery("#"+selName+" option").each(function(){
jQuery(this).remove();
});
jQuery("<option value=0>请选择</option>").appendTo(jQuery("#"+selName));
if(jQuery("#"+sel).val()==0){
return;
}
jQuery.getJSON(url,{pid:jQuery("#"+sel).val(),type:type_id},
function(data){
if(data){
jQuery.each(data,function(idx,item){
jQuery("<option value="+item.id+">"+item.name+"</option>").appendTo(jQuery("#"+selName));
});
}else{
jQuery("<option value='0'>请选择</option>").appendTo(jQuery("#"+selName));
}
}
);
}
</script>
</html>
php：
<?php
namespace HomeController;
use ThinkController;
class IndexController extends Controller{
/**
* 用户信息查询
*/
public function index(){
$province = M('Tree')->where ( array('pid'=>1) )->select ();
$this->assign('province',$province);
$this->display();
}
public function getRegion(){
$Region=M("Tree");
$map['pid']=$_REQUEST["pid"];
$map['type']=$_REQUEST["type"];
$list=$Region->where($map)->select();
echo json_encode($list);
}
}
sql语句：
DROP TABLE IF EXISTS `gc_tree`; CREATE TABLE `gc_tree` ( `id` int(5) unsigned NOT NULL AUTO_INCREMENT, `pid` int(5) unsigned NOT NULL DEFAULT '0', `name` varchar(120) DEFAULT NULL, `type` tinyint(1) DEFAULT '2', PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
数据文件：链接: https://pan.baidu.com/s/1jHMAxCU 密码: 5y79