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Laravel手动分页实现方法详解

更新时间:2020-03-12 00:45:55 作者:startmvc
本文实例讲述了Laravel手动分页实现方法。分享给大家供大家参考,具体如下:这里的演示

本文实例讲述了Laravel手动分页实现方法。分享给大家供大家参考,具体如下:

这里的演示实例基于Laravel的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!

看看最终效果:

Laravel 手动分页