Thinkphp3实现省市区三级联动

基于TP3，一张表实现省市区三级联动【3409条数据】

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);
}

<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>

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>

DROP TABLE IF EXISTS `tp_tree`;
CREATE TABLE `tp_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=3410 DEFAULT CHARSET=utf8;

下载：TP_tree.sql

稍后更新TP5版本。