For manual paging of laravel, laravel Paging

For manual paging of laravel, laravel Paging

Generally, we only need to useThe paginate method is easy to handle. But what about the combination of arrays? At this time, we need to use custom pages. First, let's take a look at laravel's paging method source code:

# 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,]);}
We found that the key is to use lengthAwarePaginator.
The construction method of LengthAwarePaginator is as follows:

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);}

Assume that the array obtained by pagination is:

[  {    "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,  }]

Here there are three data entries in total. We set each page to display one and a total of three pages.
Paging call
Use Illuminate \ Pagination \ LengthAwarePaginator;
Use Illuminate \ Pagination \ Paginator;

Public function show (Request $ request ){
$ PerPage = 1; // The number displayed on each page
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); // comment 1
$ Total = count ($ real );

$ Paginator = new LengthAwarePaginator ($ item, $ total, $ perPage, $ current_page ,[
'Path' => Paginator: resolveCurrentPath (), // comment 2
'Pagename' => 'page ',
]);
Return response ()-> json (['result' => $ paginator])
}

The focus of the above Code is $ item. If you do not perform annotation 1, all seven pieces of data are obtained.

Note 2 sets a url to be paged. You can also manually set it through $ paginator-> setPath ('path.

Page connections are also called in the same way {{$ paginator-> render ()}}

Note: The returned data format is roughly as follows:

"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  }