laravel接口规范
Laravel5.5 手动分页和自定义分页样式的简单实现基于Laravel5.5 在项目实施过程中，需要对从接口中获取的数据（或者通过搜索工具查询出来的数据）进行分页
一、创建手动分页
在laravel自带的分页中，一般是通过数据库查询访问paginate()方法来达到分页的效果 ，like this：
class IndexControllerextends Controller
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{ publicfunctionindex() { $person = DB::table('person')->paginate(15); return view('index.pagTest',['person'=> $person]); }} |
查看框架的分页源代码
#vender/laravel/framework/src/Illuminate/Database/Eloquent/Builder.php
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/** * Paginate the given query. * * @param int $perPage * @param array $columns * @param string $pageName * @param int|null $page * @return \Illuminate\Contracts\Pagination\LengthAwarePaginator * * @throws \InvalidArgumentException */ public function paginate($perPage = null, $columns = ['*'], $pageName = 'page', $page = null) { $page = $page ?: Paginator::resolveCurrentPage($pageName); $perPage = $perPage ?: $this->model->getPerPage(); $results = ($total = $this->toBase()->getCountForPagination()) ? $this->forPage($page, $perPage)->get($columns) : $this->model->newCollection(); return $this->paginator($results, $total, $perPage, $page, [ 'path' => Paginator::resolveCurrentPath(), 'pageName' => $pageName, ]); } |
发现，分页用了 \Illuminate\Contracts\Pagination\LengthAwarePaginator 构造方法，查看这个构造方法
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<?php namespace Illuminate\Pagination; use Countable;use ArrayAccess;use JsonSerializable;use IteratorAggregate;use Illuminate\Support\Collection;use Illuminate\Support\HtmlString;use Illuminate\Contracts\Support\Jsonable;use Illuminate\Contracts\Support\Arrayable;use Illuminate\Contracts\Pagination\LengthAwarePaginator as LengthAwarePaginatorContract; class LengthAwarePaginator extends AbstractPaginator implements Arrayable, ArrayAccess, Countable, IteratorAggregate, JsonSerializable, Jsonable, LengthAwarePaginatorContract{ /** * The total number of items before slicing. * * @var int */ protected $total; /** * The last available page. * * @var int */ protected $lastPage; /** * Create a new paginator instance. * * @param mixed $items * @param int $total * @param int $perPage * @param int|null $currentPage * @param array $options (path, query, fragment, pageName) * @return void */ public function __construct($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); } |
如果要实现手动分页，只需要使用这个构造方法，给定参数，就能达到分页的效果
贴代码：
public function setPage2(Request $request,$data,$prepage,$total){
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#每页显示记录 $prePage = $prepage; //$total =count($data); $allitem = $prepage *100; $total > $allitem ? $total = $allitem : $total; if(isset($request->page)){ $current_page =intval($request->page); $current_page =$current_page<=0?1:$current_page; }else{ $current_page = 1; } #url操作 $url = $url='http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]; if(strpos($url,'&page')) $url=str_replace('&page='.$request->page, '',$url); # $data must be array $item =array_slice($data,($current_page-1)*$prePage,$prePage); $paginator = new LengthAwarePaginator($item,$total,$prePage,$current_page,[ 'path'=>$url, 'pageName'=>'page' ]); return $paginator;} |
（$data 为需要进行分页的数据）
说明：
1、在考虑到代码的复用性，我将分页代码封装到app/Controllers/Controller.php中的一个方法里面，这样在其他控制器里只需要$this->setPage(Request $request,$data,$prepage,$total) 就能使用了，（前提：其他控制器继承了Controller.php）
2、分页的URL，因为我的项目的url一定会携带一个kw参数，所以我直接用str_replace替换"&page",如果是存在不携参分页的话，需要判断，到底是"?page"还是"&page"。（url的逻辑可以自己写）
#分页 php
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$paginator = $this->setPage2($request,$data,25,$sum); $data =$paginator->toArray()['data']; |
在模板中：{{$paginator->render()}}即能输出分页HTML，样式如下：
二、自定义分页样式
在实际开发中，不希望用户在浏览时直接浏览最后几页，只想用户从前往后依次的浏览，如百度搜索分页，这时候，就想修改分页的样式，经过一个下午的奋战，贴出解决过程
在上一环节中，手动创建了分页，了解HTML的模板生成是render()方法，
#\Illuminate\Contracts\Pagination\LengthAwarePaginator
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/** * Render the paginator using the given view. * * @param string|null $view * @param array $data * @return \Illuminate\Support\HtmlString */ public function render($view = null, $data = []) { return new HtmlString(static::viewFactory()->make($view ?: static::$defaultView, array_merge($data, [ 'paginator' => $this, 'elements' => $this->elements(), ]))->render()); } |
经过思考，我们不去改laravel框架的源代码，可以通过重构render方法或者重新定义一个生成HTML模板的方法来实现自定义HTML模板
因为我们只需要自定义HTML模板，所以，可以创建一个文件，继承\Illuminate\Contracts\Pagination\LengthAwarePaginator 类
看代码：
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<?php namespace App\Helpers; use Illuminate\Pagination\LengthAwarePaginator;/** * Created by PhpStorm. * User: 1 * Date: 2018/4/9 * Time: 9:08 */class Newpage extends LengthAwarePaginator { public $de_page = 10; //默认显示分页数 public $pageHtml; public function newrender(){ if($this->hasPages()) { return sprintf("<ul class='pagination'>%s %s %s</ul>", $this->pre_page(), $this->pages_num(), $this->next_page() ); } } #上一页 public function pre_page(){ if($this->currentPage == 1){ //dd($this->currentPage); return "<li class='disabled'><span>《</span></li>"; }else{ $url = $this->path."&page=".($this->currentPage-1); //dd($url); return "<li><a href=".$url." rel="external nofollow" rel='prev'>《</a></li>"; } } #页码 public function pages_num(){ $pages = ''; if($this->currentPage <= 6){ for($i = 1; $i <= $this->de_page; $i++){ if($this->currentPage == $i){ $pages .= "<li class='active'><a href=".$this->path." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" &page=".$i.">".$i."</a></li>"; }else{ $pages .="<li><a href=".$this->path." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" &page=".$i.">".$i."</a></li>"; } } }else{ #当前页前边部分 for($i = 5; $i >=1 ; $i--){ $url =$this->currentPage-$i; $pages .= "<li><a href=".$this->path." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" &page=".$url.">".$url."</a></li>"; } #当前页 $pages .= "<li class='active'><span>".猜您喜欢
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