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PHP框架Laravel插件Pagination实现自定义分页

网络编程 2021-07-05 09:10www.168986.cn编程入门
这篇文章主要为大家详细介绍了PHP框架Laravel5.1插件Pagination实现自定义分页的相关资料，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

Laravel 的分页很方便，其实扩展起来也挺容易的，狼蚁网站SEO优化就来做个示例，扩展一下 paginate() 和 simplePaginate() 方法，来实现我们自定义分页样式，比如显示 "上一页" 和 "下一页" ，而不是 "《" 和 "》" ，扩展的方法掌握了你就可以肆无忌惮的扩展一个你想要的分页了，比如跳转到某一页，分页显示一共多少记录，当前显示的记录范围等等巴拉巴拉的。

5.1和5.2应该是同样的方法，我这里用的是5.2的版本。文档告诉我们 Paginator 对应于查询语句构造器和 Eloquent 的  simplePaginate 方法，而  LengthAwarePaginator 则等同于  paginate 方法。那我们还是来看下源码，具体这个  paginate 是如何实现 render() 的,

Illuminate/Pagination/LengthAwarePaginator.php

<?php

namespace Illuminate\Pagination;

......

class LengthAwarePaginator extends AbstractPaginator implements Arrayable, ArrayAess, Countable, IteratorAggregate, JsonSerializable, Jsonable, LengthAwarePaginatorContract 
{
......
 public function render(Presenter $presenter = null)
 {
  if (is_null($presenter) && static::$presenterResolver) {
   $presenter = call_user_func(static::$presenterResolver, $this);
  }

  $presenter = $presenter ?: new BootstrapThreePresenter($this);

  return $presenter->render();
 }
......
}

render() 中传入的是一个 Presenter 的实例，并调用这个实例化的 render 方法来实现分页的显示的。如果没有则调用 BootstrapThreePresenter 中 render() 的，来看看 BootstrapThreePresenter 是干嘛的

Illuminate/Pagination/BootstrapThreePresenter.php

<?php

namespace Illuminate\Pagination;

use Illuminate\Support\HtmlString; 
use Illuminate\Contracts\Pagination\Paginator as PaginatorContract; 
use Illuminate\Contracts\Pagination\Presenter as PresenterContract;

class BootstrapThreePresenter implements PresenterContract 
{
 use BootstrapThreeNextPreviousButtonRendererTrait, UrlWindowPresenterTrait;

 /
   The paginator implementation.
  
   @var \Illuminate\Contracts\Pagination\Paginator
  /
 protected $paginator;

 /
   The URL window data structure.
  
   @var array
  /
 protected $window;

 /
   Create a new Bootstrap presenter instance.
  
   @param \Illuminate\Contracts\Pagination\Paginator $paginator
   @param \Illuminate\Pagination\UrlWindow|null $window
   @return void
  /
 public function __construct(PaginatorContract $paginator, UrlWindow $window = null)
 {
  $this->paginator = $paginator;
  $this->window = is_null($window) ? UrlWindow::make($paginator) : $window->get();
 }

 /
   Determine if the underlying paginator being presented has pages to show.
  
   @return bool
  /
 public function hasPages()
 {
  return $this->paginator->hasPages();
 }

 /
   Convert the URL window into Bootstrap HTML.
  
   @return \Illuminate\Support\HtmlString
  /
 public function render()
 {
  if ($this->hasPages()) {
   return new HtmlString(sprintf(
    '<ul class="pagination">%s %s %s</ul>',
    $this->getPreviousButton(),
    $this->getLinks(),
    $this->getNextButton()
   ));
  }

  return '';
 }
......
}

这里可以看到 BootstrapThreePresenter 实现了 PresenterContract 的接口， render() 才是分页显示的真正实现，构造方法中的第一个参数 PaginatorContract 其实就是一个 Paginator 我们继续看下 PresenterContract 也就是 Presenter 接口中定义了什么方法需要实现

illuminate/contracts/Pagination/Presenter.php

<?php

namespace Illuminate\Contracts\Pagination;

interface Presenter 
{
 /
   Render the given paginator.
  
   @return \Illuminate\Contracts\Support\Htmlable|string
  /
 public function render();

 /
   Determine if the underlying paginator being presented has pages to show.
  
   @return bool
  /
 public function hasPages();
}

其中定义了 render 和 hasPages 方法需要实现

好了，那我们现在已经很清晰了,我们要自定义分页的显示，那么就要写一个我们自己的 Presenter 来实现接口中的 render() 和 hasPages() 就可以了。

就来简单的实现一个paginate()，显示出来"上一页"和"下一页"，中间是分页数字的例子。

新建文件如下（个人习惯）

app/Foundations/Pagination/CustomerPresenter.php

<?php 
namespace App\Foundations\Pagination;

use Illuminate\Contracts\Pagination\Presenter as PresenterContract; 
use Illuminate\Contracts\Pagination\LengthAwarePaginator as PaginatorContract; 
use Illuminate\Pagination\UrlWindow; 
use Illuminate\Support\HtmlString; 
use Illuminate\Pagination\BootstrapThreeNextPreviousButtonRendererTrait; 
use Illuminate\Pagination\UrlWindowPresenterTrait;

class CustomerPresenter implements PresenterContract 
{
 use BootstrapThreeNextPreviousButtonRendererTrait, UrlWindowPresenterTrait;

 protected $paginator;

 protected $window;

 /
   Create a new Bootstrap presenter instance.
  
   @param \Illuminate\Contracts\Pagination\Paginator $paginator
   @param \Illuminate\Pagination\UrlWindow|null $window
   @return void
  /
 public function __construct(PaginatorContract $paginator, UrlWindow $window = null)
 {
  $this->paginator = $paginator;
  $this->window = is_null($window) ? UrlWindow::make($paginator) : $window->get();
 }

 /
   Determine if the underlying paginator being presented has pages to show.
  
   @return bool
  /
 public function hasPages()
 {
  return $this->paginator->hasPages();
 }

 /
   Convert the URL window into Bootstrap HTML.
  
   @return \Illuminate\Support\HtmlString
  /
 public function render()
 {
  if ($this->hasPages()) {
   return new HtmlString(sprintf(
    '<ul class="pagination">%s %s %s</ul>',
    $this->getPreviousButton('上一页'),//具体实现可以查看该方法
    $this->getLinks(),
    $this->getNextButton('下一页')//具体实现可以查看该方法
   ));
  }

  return '';
 }

 /
   Get HTML wrapper for an available page link.
  
   @param string $url
   @param int $page
   @param string|null $rel
   @return string
  /
 protected function getAvailablePageWrapper($url, $page, $rel = null)
 {
  $rel = is_null($rel) ? '' : ' rel="' . $rel . '"';

  return '<li><a href="' . htmlentities($url) . '"' . $rel . '>' . $page . '</a></li>';
 }

 /
   Get HTML wrapper for disabled text.
  
   @param string $text
   @return string
  /
 protected function getDisabledTextWrapper($text)
 {
  return '<li class="disabled hide"><span>' . $text . '</span></li>';
 }

 /
   Get HTML wrapper for active text.
  
   @param string $text
   @return string
  /
 protected function getActivePageWrapper($text)
 {
  return '<li class="active"><span>' . $text . '</span></li>';
 }

 /
   Get a pagination "dot" element.
  
   @return string
  /
 protected function getDots()
 {
  return $this->getDisabledTextWrapper('...');
 }

 /
   Get the current page from the paginator.
  
   @return int
  /
 protected function currentPage()
 {
  return $this->paginator->currentPage();
 }

 /
   Get the last page from the paginator.
  
   @return int
  /
 protected function lastPage()
 {
  return $this->paginator->lastPage();
 }

}

就这么简单，主要就是 render() 方法，如果项目中需要修改分页样式，或者添加分页跳转之类的需求只要重写其中的各项显示的方法中的html元素就可以了，很灵活，在blade模板中也需要修该，比如我们的 Paginator 叫 $users ,默认的分页显示是这样的

{!! $users->render() !!}
修改成我们自定义后的分页显示

{!! with(new \App\Foundations\Pagination\CustomerPresenter($categories))->render() !!}
好了，这样在页面应该就可以看到分页链接中含有 "上一页"和"下一页"加数字的样式了。

那么如果扩展simplePaginate?其实很简单，只要继承刚才的 CustomerPresenter ，实现 hasPages 和 render ,至于为什么可以按照我上面查看源码的方式看一下就知道了，比如我们改成"上一篇"和"下一篇"

新建App\Foundations\Pagination\CustomerSimplePresenter.php

<?php 
namespace App\Foundations\Pagination;


use Illuminate\Support\HtmlString; 
use Illuminate\Contracts\Pagination\Paginator as PaginatorContract;

class CustomerSimplePresenter extends CustomerPresenter 
{
 /
   Create a simple Bootstrap 3 presenter.
  
   @param \Illuminate\Contracts\Pagination\Paginator $paginator
   @return void
  /
 public function __construct(PaginatorContract $paginator)
 {
  $this->paginator = $paginator;
 }

 /
   Determine if the underlying paginator being presented has pages to show.
  
   @return bool
  /
 public function hasPages()
 {
  return $this->paginator->hasPages() && count($this->paginator->items()) > 0;
 }

 /
   Convert the URL window into Bootstrap HTML.
  
   @return \Illuminate\Support\HtmlString
  /
 public function render()
 {
  if ($this->hasPages()) {
   return new HtmlString(sprintf(
    '<ul class="pager">%s %s</ul>',
    $this->getPreviousButton('上一篇'),
    $this->getNextButton('下一篇')
   ));
  }

  return '';
 }

}

分页显示

{!! with(new \App\Foundations\Pagination\CustomerSimplePresenter($categories))->render() !!}

方法就是这个方法，具体修改按照自己需求重写其中对应的显示html元素的方法就可以了。

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