yuan/application/admin/controller/Banner.php

<?php

namespace app\admin\controller;

use app\common\controller\Backend;
use think\Db;

/**
 * 轮播图
 *
 * @icon fa fa-circle-o
 */
class Banner extends Backend
{
    
    /**
     * Banner模型对象
     * @var \app\admin\model\Banner
     */
    protected $model = null;

    public function _initialize()
    {
        parent::_initialize();
        $this->model = new \app\admin\model\Banner;

    }

    public function import()
    {
        parent::import();
    }

    /**
     * 默认生成的控制器所继承的父类中有index/add/edit/del/multi五个基础方法、destroy/restore/recyclebin三个回收站方法
     * 因此在当前控制器中可不用编写增删改查的代码,除非需要自己控制这部分逻辑
     * 需要将application/admin/library/traits/Backend.php中对应的方法复制到当前控制器,然后进行修改
     */
    

    /**
     * 查看
     */
    public function index()
    {
        //当前是否为关联查询
        $this->relationSearch = false;
        //设置过滤方法
        $this->request->filter(['strip_tags', 'trim']);
        if ($this->request->isAjax()) {
            //如果发送的来源是Selectpage，则转发到Selectpage
            if ($this->request->request('keyField')) {
                return $this->selectpage();
            }
            list($where, $sort, $order, $offset, $limit) = $this->buildparams();

            $list = $this->model
                    
                    ->where($where)
                    ->order($sort, $order)
                    ->paginate($limit);

            foreach ($list as $row) {
                $row->visible(['id','type','title_id','image','switch','sort','create_time']);
                
            }

            $result = array("total" => $list->total(), "rows" => $list->items());

            return json($result);
        }
        return $this->view->fetch();
    }
    // js二级联动搜索和添加删除二级联动返回数据格式
    public function indexxxx()
    {
        $data = Db::name('city')->field('id value,name')->select();
        $res = [
            ['value' =>'1','name' =>'政策集锦'],
            ['value' =>'2','name' =>'企业服务'],
            ['value' =>'3','name' =>'在线学习'],
            ['value' =>'4','name' =>'党建资讯'],

        ];
        return $this->success('','',$res);
    }
    // 添加删除二级联动返回数据
    public function indexxxxx()
    {
        $pid = $this->request->param('pid');
        if (empty($pid)) return $this->error('错误');

        if($pid == 1) {
            $data = Db::name('policy_lists')->where('switch',1)->order('sort desc')->field('id value,title name')->select();
        }
        if($pid == 2) {
            $data = Db::name('business_lists')->where('switch',1)->order('sort desc')->field('id value,title name')->select();
        }
        if($pid == 3) {
            $data = Db::name('study')->where('switch',1)->order('sort desc')->field('id value,title name')->select();
        }
        if($pid == 4) {
            $data = Db::name('building_news')->where('switch',1)->order('sort desc')->field('id value,title name')->select();
        }
//        $data = Db::name('park_lists')->where('c_id',$pid)->field('id value,name')->select();
        return $this->success('','',$data);
    }
}