Thinkphp实现省市区三级联动

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);
}

省份/直辖市
{$vo.name}市/县镇/区

function loadRegion(sel,type_id,selName,url){
    jQuery("#"+selName+" option").each(function(){
        jQuery(this).remove();
    });
    jQuery("请选择").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(""+item.name+"").appendTo(jQuery("#"+selName));
                });
            }else{
                jQuery("请选择").appendTo(jQuery("#"+selName));
            }
        }
    );
}

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;