省市区三级联动

首先，php端代码如下：

public function house_add(){ $PRovincelist = M('area')->where(array('area_parent_id'=>0,'area_deep'=>1))->select(); $this->assign('provincelist',$provincelist); $this->assign('country',C("country")); $this->assign('property_type',C("property_type")); $this->display(); }然后，html端代码如下：

<div class="form-group"  id="pcd" >										<label class="col-sm-3 control-label no-padding-right" for="form-field-4">省市区：</label>										<div class="col-sm-9">										<select id="province" name="province">										 <option value=''>请选择</option>									    <volist name="provincelist" id="po">									        <option value='{$po.area_id}'>{$po.area_name}</option>									    </volist>										</select>										<select id="city"  name="city"><option value=''>请选择</option></select>										<select id="district" name="district"><option value=''>请选择</option></select>										<span class="error_msg" id='error_district'></span>										</div>									</div>接着，jq代码如下：
<script>//加载市区下拉	$('#province').change(function(){	    var pid = $(this).val();	    $.get("/Home/House/address",{'pid':pid}, function (i) {	        if(i.status=='1'){	            $('#city').append(i.data);		        }	    },'json');	})		$('#city').change(function(){	    var cid = $(this).val();	    $.get("/Home/House/address",{'cid':cid}, function (i) {	        if(i.status=='2'){	            $('#district').append(i.data);	        }	    },'json');	})  </script>最后上address的代码：
//省市区联动    public function address(){        //市        $pid = I('get.pid');        $citylist = M('area')->where(array('area_parent_id'=>$pid,'area_deep'=>2))->select();        if($citylist){            $cityinfo ='';                foreach ($citylist as $key=>$val) {                   $cityinfo .='<option value="'.$val['area_id'].'">'.$val['area_name'].'</option>';                }            echo json_encode(array('status'=>1,'data'=>$cityinfo));        }        // 县        $cid = I('get.cid');        $areaslist = M('area')->where(array('area_parent_id'=>$cid,'area_deep'=>3))->select();        if($areaslist){            $areasinfo = "";                foreach ($areaslist as $k=>$v) {                   $areasinfo .='<option value="'.$v['area_id'].'">'.$v['area_name'].'</option>';                }            echo json_encode(array('status'=>2,'data'=>$areasinfo));        }    }