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laravel的分页问题实例

程序员文章站 2022-04-07 08:53:06
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分页是在网页上是很常用的,基本上每个网页都有。首先我们看下laravel得分页方法源码:
#vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php:480public function paginate($perPage = null, $columns = ['*'], $pageName = 'page', $page = null)
{$query = $this->toBase();$total = $query->getCountForPagination();$this->forPage($page = $page ?: Paginator::resolveCurrentPage($pageName),$perPage = $perPage ?: $this->model->getPerPage()
        );return new LengthAwarePaginator($this->get($columns), $total, $perPage, $page, ['path' => Paginator::resolveCurrentPath(),'pageName' => $pageName,
        ]);
}
我们发现这个关键就是用了lengthAwarePaginator.
  LengthAwarePaginator的构造方法,如下:
假定分页得数组为:
[
  {
    "id": 9,
    "sys_id": 1,
    "org_id": 2,
    "user_id": 8,
    "papaer_id": 26,
  },
  {
    "id": 5,
    "sys_id": 1,
    "org_id": 2,
    "user_id": 8,
    "papaer_id": 26,
  },
  {
    "id": 1,
    "sys_id": 1,
    "org_id": 2,
    "user_id": 8,
    "papaer_id": 26,
  }
]
这里一共3条数据,我们设定每页显示1个,一共3页。
分页调用
   use Illuminate\Pagination\LengthAwarePaginator;
  use Illuminate\Pagination\Paginator;

  public function show(Request $request){
        $perPage = 1;            //每页显示数量
        if ($request->has('page')) {
                $current_page = $request->input('page');
                $current_page = $current_page <= 0 ? 1 :$current_page;
        } else {
                $current_page = 1;
        }
        $item = array_slice($real, ($current_page-1)*$perPage, $perPage); //注释1
        $total = count($real);

        $paginator =new LengthAwarePaginator($item, $total, $perPage, $current_page, [
                'path' => Paginator::resolveCurrentPath(),  //注释2
                'pageName' => 'page',
        ]);
          return response()->json(['result'=>$paginator])
   }

  上面的代码中的重点是$item,如果不做注释1处理,得出的是所有7条数据。

  注释2处就是设定个要分页的url地址。也可以手动通过 $paginator ->setPath(‘路径’) 设置。

  页面中的分页连接也是同样的调用方式 {{ $paginator->render() }}

注:返回得数据格式大概如下所示:

"result": {
    "current_page": 3,
    "data": [
    { 
      "id": 5, 
      "sys_id": 1,
      "org_id": 2,
       "user_id": 8, 
          "papaer_id": 26
     }
    ],
    "from": null,
    "last_page": 2,
    "next_page_url": null,
    "path": "http://www.text.tld/examination/show",
    "per_page": 2,
    "prev_page_url": "http://www.text.tld/examination/show?page=2",
    "to": null,
    "total": 3
  }

以上就是laravel的分页问题实例的详细内容,更多请关注其它相关文章!