Laravel5.5 手动分页和自定义分页样式的简单实现-巨人网络通讯

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：

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'>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
      $pages .= "li class='active'>span>".$this->currentPage."/span>/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'>span>》/span>/a>/li>";
    }else{
      return "li class='disabled'>span>》/span>/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()
      );
    }
  }

模板中通过：{{$paginator->render()}}输出HTML

最终效果如图：

注意：自定义HTML后因为新建了一个类继承了LengthAwarePaginator类，需要将第一步手动分页的方法中new LengthAwarePaginator 修改为 new Newpage 参数不变。

以上这篇Laravel5.5 手动分页和自定义分页样式的简单实现就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。

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