Laravel manually creates array pagination

This article mainly introduces the implementation code for manually creating array paging in Laravel. The editor thinks it is quite good. Now I will share it with you and give it as a reference.

This article introduces the implementation code of manually creating array paging in laravel and shares it with everyone. The details are as follows:

laravel paging function:

There are several ways to paginate data. The simplest is to use the paginate or simplePaginate method in the Query Builder or Eloquent Query.

paginate usage is as follows:

//控制器中
$users = DB::table('users')->paginate(15);
return view('user.index', ['users' => $users]);

//视图中
{{ $users->links() }}

The effect is as follows:

「Previous page」「1」「 2" "3" "Next page"

simplePaginate usage is as follows:

//控制器中
$users = User::where('votes', '>', 100)->simplePaginate(15);
return view('user.index', compact('users'));

//视图中
{{ $users->links() }}

The effect is as follows:

「Previous page」「Next page」

Note:

1. If you only need to display a simple "Next page" in paginated view "Page" and "Previous Page" links, that is, there is no need to display links for each page number. It is recommended to use the simplePaginate method to perform more efficient queries.

2. Currently, Laravel cannot efficiently perform paging operations using the groupBy statement. If you need to use groupBy in a paginated result set, it is recommended that you query the database and create the paginator manually.

Sometimes you may encounter this situation. $dataA and $dataB are two different data sets taken out from the database. You need to assign $dataA and $dataB to the view at the same time. And perform paging display, what should we do in this case?

#In this case, laravel array paging can be used.

In fact, the laravel documentation has already written about how to use the paging class to paginate, but there is no detailed explanation.

Manually create pagination

If you want to manually create a paging instance and finally get an array type result, you can create an IlluminatePaginationPaginator or IlluminatePaginationLengthAwarePaginator instance according to your needs.

For details, please see this code in IlluminatePaginationLengthAwarePaginator:

public function __construct($items, $total, $perPage, $currentPage = null, array $options = [])
 {
  foreach ($options as $key => $value) {
   $this->{$key} = $value;
  }

  $this->total = $total;
  $this->perPage = $perPage;
  $this->lastPage = max((int) ceil($total / $perPage), 1);
  $this->path = $this->path !== '/' ? rtrim($this->path, '/') : $this->path;
  $this->currentPage = $this->setCurrentPage($currentPage, $this->pageName);
  $this->items = $items instanceof Collection ? $items : Collection::make($items);
 }

The following is the specific implementation code:

//控制器中
public function index(LiveService $liveService, Request $request)
 {
  //数据A
  $dataA = User::where('status', 1)->get()->toArray();
  //数据B
  $dataB = User::where('status', 2)->get()->toArray();
  $data = array_merge($dataA, $dataB);
  //当前页数 默认1
  $page = $request->page ?: 1;
  //每页的条数
  $perPage = 4;
  //计算每页分页的初始位置
  $offset = ($page * $perPage) - $perPage;
   //实例化LengthAwarePaginator类，并传入对应的参数
  $data = new LengthAwarePaginator(array_slice($data, $offset, $perPage, true), count($data), $perPage,
   $page, ['path' => $request->url(), 'query' => $request->query()]);
  return view('admin.users.index', compact('data'));
 }

//视图中
{{ $data->links() }}

The above basically completes array paging. The general process is that the controller obtains the current page number, instantiates the LengthAwarePaginator class and passes in the necessary parameters. According to the number of each page Use the array_slice() method to obtain the data to be displayed on each page.

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