Laravel5.5 手动分页和自定义分页样式的简单实现

发布:smiling　来源: PHP粉丝网　添加日期：2022-01-04 20:17:46　浏览: 评论：0　

今天小编就为大家分享一篇Laravel5.5 手动分页和自定义分页样式的简单实现，具有很好的参考价值，希望对大家有所帮助，一起跟随小编过来看看吧。

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

{

  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

/**

   * 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

<?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){

 #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

$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：

Laravel5.5手动分页自定义分页

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

/**

   * 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：

<?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'>《</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

 $pages .= "<li class='active'>".$this->currentPage."</li>";

 #当前页后边部分

 for($i = 1;$i < 5; $i++ ){

 $nowpage =$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=".$nowpage.">".$nowpage."</a></li>";

 }

 }

 return $pages;



 }

 #下一页

 public function next_page(){

 if($this->currentPage < $this->total){

 $page =$this->currentPage+1;

 return "<li><a href=".$this->path." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" &page=".$page." rel='next'>》</a></li>";

 }else{

 return "<li class='disabled'>》</li>";

 }



 }



}

我选择的方法是自定义新的方法生成HTML模板，模板中通过：{{$paginator->newrender()}}输出HTML

如果选择重构render()方法，只需要将上面的newrender()方法做一些小变动

public function render($view=null,$data=[]){



 if($this->hasPages())

 {

 return sprintf("<ul class='pagination'>%s %s %s</ul>",

 $this->pre_page(),

 $this->pages_num(),

 $this->next_page()

 );

 }

 }