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

{  
  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 $page
   * @return IlluminateContractsPaginationLengthAwarePaginator
   *
   * @throws InvalidArgumentException
   */
  public function paginate($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 IlluminateContractsPaginationLengthAwarePaginator 构造方法，查看这个构造方法

<?php
 
namespace IlluminatePagination;
 
use Countable;
use ArrayAccess;
use JsonSerializable;
use IteratorAggregate;
use IlluminateSupportCollection;
use IlluminateSupportHtmlString;
use IlluminateContractsSupportJsonable;
use IlluminateContractsSupportArrayable;
use IlluminateContractsPaginationLengthAwarePaginator 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,

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，

#IlluminateContractsPaginationLengthAwarePaginator

/**
   * Render the paginator using the given view.
   *
   * @param string|null $view
   * @param array $data
   * @return IlluminateSupportHtmlString
   */
  public function render($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IlluminateContractsPaginationLengthAwarePaginator 类

看代码：

<?php
namespace AppHelpers;
use IlluminatePaginationLengthAwarePaginator;
/**
* 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。

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