laravel的分页问题实例
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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 }
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