Laravel 手动分页实现
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Laravel 手动分页实现
基于5.2版本
在开发过程中有这么一种情况,你请求Java api获取信息,由于信息较多,需要分页显示。Laravel官方提供了一个简单的方式paginate($perPage),但是这种方法只适用model、查询构建器。
今天说下 给定一个数组如何实现 和paginate方法一样的效果。
查看paginate方法源码
#vendor/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php:480 public function paginate($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\' => $pageName, ]); }
从上面就可以看出,分页的关键就在于LengthAwarePaginator。
LengthAwarePaginator的构造方法。
public function __construct($items, $total, $perPage, $currentPage = null, array $options = []) { foreach ($options as $key => $value) { $this->{$key} = $value; } $this->total = $total; $this->perPage = $perPage; $this->lastPage = (int) ceil($total / $perPage); $this->path = $this->path != \'/\' ? rtrim($this->path, \'/\') : $this->path; $this->currentPage = $this->setCurrentPage($currentPage, $this->lastPage); $this->items = $items instanceof Collection ? $items : Collection::make($items); }
其实已经很明白了,假如要分页的数组为
[ [\'username\'=>\'zhangsan\', \'age\'=>26], [\'username\'=>\'lisi\', \'age\'=>23], [\'username\'=>\'wangwu\', \'age\'=>62], [\'username\'=>\'zhaoliu\', \'age\'=>46], [\'username\'=>\'wangmazi\', \'age\'=>25], [\'username\'=>\'lanzi\', \'age\'=>24], [\'username\'=>\'pangzi\', \'age\'=>21], ]
共7条数据,每页显示3条,共3页
use Illuminate\\Pagination\\LengthAwarePaginator; use Illuminate\\Pagination\\Paginator; use Illuminate\\Http\\Request; # 仅做演示 # function userList(Request $request) { $users = [ [\'username\'=>\'zhangsan\', \'age\'=>26], [\'username\'=>\'lisi\', \'age\'=>23], [\'username\'=>\'wangwu\', \'age\'=>62], [\'username\'=>\'zhaoliu\', \'age\'=>46], [\'username\'=>\'wangmazi\', \'age\'=>25], [\'username\'=>\'lanzi\', \'age\'=>24], [\'username\'=>\'pangzi\', \'age\'=>21] ]; $perPage = 3; if ($request->has(\'page\')) { $current_page = $request->input(\'page\'); $current_page = $current_page <= 0 ? 1 :$current_page; } else { $current_page = 1; } $item = array_slice($users, ($current_page-1)*$perPage, $perPage); //注释1 $total = count($users); $paginator =new LengthAwarePaginator($item, $total, $perPage, $currentPage, [ \'path\' => Paginator::resolveCurrentPath(), //注释2 \'pageName\' => \'page\', ]); $userlist = $paginator->toArray()[\'data\']; return view(\'userlist\', compact(\'userlist\', \'paginator\')); }
上面的代码中的重点是$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() }}
好了,基本就是这样,有纰漏的地方欢迎指正!
转:https://blog.csdn.net/hxx_yang/article/details/51753134
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