如何用Thinkphp实现省市区三级联动功能？

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phppublic function index(){ $province=M('Tree')->where(array('pid'=> 1))->select(); $this->assign('province', $province); $this->display();}

public function getRegion(){ $Region=M('Tree');}

一张表实现省市区三级联动

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;