ajax省市县三级联动

js事件

    $('#ProvinceId').change(function(){
            var parentId = $(this).val();
            $.ajax({
                url: '{sh::U("OpenStore/ajax","todo=getCity")}',
                type: 'POST',
                data: 'parentId='+parentId,
                dataType:'json',
                success: function(json) {
                    if (json.status == 1) {
                        var optionCity = "<option value=''>==请选择==</option>";
                        $.each(json.info,function(i,n){
                            optionCity += "<option value="+i+">" + n + "</option>";
                        });
                        var optionCounty = "<option value=''>==请选择==</option>";
                        // 重置市、县
                        $('#CityId').html(optionCity).val('');
                        $('#CountyId').html(optionCounty).val('');
                    } else {
                        layer.msg('获取数据异常');
                    }
                }
            });
        });

        $('#CityId').change(function(){
            var parentId = $(this).val();
            $.ajax({
                url: '{sh::U("OpenStore/ajax","todo=getCounty")}',
                type: 'POST',
                data: 'parentId='+parentId,
                dataType:'json',
                success: function(json) {
                    if (json.status == 1) {
                        var optionCounty = "<option value=''>==请选择==</option>";
                        $.each(json.info,function(i,n){
                            optionCounty += "<option value="+i+">" + n + "</option>";
                        });
                        // 重置县
                        $('#CountyId').html(optionCounty).val('');
                    } else {
                        layer.msg('获取数据异常');
                    }
                }
            });
            
        });

ajax

    public function ajax() {
        $todo = $this->_request('todo','trim');
        $data = array('status'=>0,'msg'=>'','info'=>array());
        switch ($todo) {
            case 'getCity':
                $parentId = $this->_post('parentId','trim');
                $getAreaData = $this->integral->getArea('2',$parentId); // 获取市
                if ($getAreaData['status'] == 1) {
                    $citys = $getAreaData['CustomProperties'];
                    $data['status'] = 1;
                    $data['info'] = $citys;
                    $data['msg'] = '获取成功';
                } else {
                    $data['status'] = 9;
                    $data['msg'] = '获取异常';
                }

                $this->ajaxReturn($data,'JSON');
                break;
            
            case 'getCounty':
                $parentId = $this->_post('parentId','trim');
                $getAreaData = $this->integral->getArea('3',$parentId); // 获取市
                if ($getAreaData['status'] == 1) {
                    $countys = $getAreaData['CustomProperties'];
                    $data['status'] = 1;
                    $data['info'] = $countys;
                    $data['msg'] = '获取成功';
                } else {
                    $data['status'] = 9;
                    $data['msg'] = '获取异常';
                }
                
                $this->ajaxReturn($data,'JSON');
                break;
            default:
                # code...
                break;
        }
    }