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关于laravel 得手动分页问题
一般得分页,我们只需要使用paginate方法,就可以简单得搞定。但是遇到数组得组合情况呢?这个时候,就需要我们使用自定义分页了。首先我们看下laravel得分页方法源码:
#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‘ => $pageName,
]);
}
我们发现这个关键就是用了lengthAwarePaginator.
LengthAwarePaginator的构造方法,如下:
public function __construct($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);
}
假定分页得数组为:
[ { "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, } ]
这里一共3条数据,我们设定每页显示1个,一共3页。
分页调用
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Pagination\Paginator;
public function show(Request $request){
$perPage = 1; //每页显示数量
if ($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); //注释1
$total = count($real);
$paginator =new LengthAwarePaginator($item, $total, $perPage, $current_page, [
‘path‘ => Paginator::resolveCurrentPath(), //注释2
‘pageName‘ => ‘page‘,
]);
return response()->json([‘result‘=>$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() }}
注:返回得数据格式大概如下所示:
"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 }
关于laravel 得手动分页问题
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