Laravel手动分页实现方法详解

2019-11-21 21:43:05

字体：大中小

来源：转载

供稿：网友

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: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,    ]);}

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：