這篇文章主要介紹了PHP框架Laravel5.1插件Pagination實現(xiàn)自定義分頁的相關(guān)資料,需要的朋友可以參考下
Laravel 的分頁很方便，其實擴(kuò)展起來也挺容易的，下面就來做個示例，擴(kuò)展一下 paginate() 和 simplePaginate() 方法，來實現(xiàn)我們自定義分頁樣式，比如顯示 "上一頁" 和 "下一頁" ，而不是 "《" 和 "》" ，當(dāng)然擴(kuò)展的方法掌握了你就可以肆無忌憚的擴(kuò)展一個你想要的分頁了，比如跳轉(zhuǎn)到某一頁，分頁顯示一共多少記錄，當(dāng)前顯示的記錄范圍等等巴拉巴拉的。。。
5.1和5.2應(yīng)該是同樣的方法，我這里用的是5.2的版本。文檔告訴我們 Paginator 對應(yīng)于查詢語句構(gòu)造器和 Eloquent 的 simplePaginate 方法，而 LengthAwarePaginator 則等同于 paginate 方法。那我們還是來看下源碼，具體這個 paginate 是如何實現(xiàn) render() 的,
Illuminate/Pagination/LengthAwarePaginator.php
<?php
namespace Illuminate\Pagination;
......
class LengthAwarePaginator extends AbstractPaginator implements Arrayable, ArrayAccess, 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() 中傳入的是一個 Presenter 的實例，并調(diào)用這個實例化的 render 方法來實現(xiàn)分頁的顯示的。如果沒有則調(diào)用 BootstrapThreePresenter 中 render() 的，來看看 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 '';
}
......
}
這里可以看到 BootstrapThreePresenter 實現(xiàn)了 PresenterContract 的接口， render() 才是分頁顯示的真正實現(xiàn)，構(gòu)造方法中的第一個參數(shù) PaginatorContract 其實就是一個 Paginator 我們繼續(xù)看下 PresenterContract 也就是 Presenter 接口中定義了什么方法需要實現(xiàn)
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();
}
其中定義了 render 和 hasPages 方法需要實現(xiàn)
好了，那我們現(xiàn)在已經(jīng)很清晰了,我們要自定義分頁的顯示，那么就要寫一個我們自己的 Presenter 來實現(xiàn)接口中的 render() 和 hasPages() 就可以了。
首先就來簡單的實現(xiàn)一個paginate()，顯示出來"上一頁"和"下一頁"，中間是分頁數(shù)字的例子。
新建文件如下（個人習(xí)慣）
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('上一頁'),//具體實現(xiàn)可以查看該方法
$this->getLinks(),
$this->getNextButton('下一頁')//具體實現(xiàn)可以查看該方法
));
}
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();
}
}
就這么簡單，主要就是 render() 方法，如果項目中需要修改分頁樣式，或者添加分頁跳轉(zhuǎn)之類的需求只要重寫其中的各項顯示的方法中的html元素就可以了，很靈活，在blade模板中也需要修該，比如我們的 Paginator 叫 $users ,默認(rèn)的分頁顯示是這樣的：
{!! $users->render() !!}
修改成我們自定義后的分頁顯示：
{!! with(new \App\Foundations\Pagination\CustomerPresenter($categories))->render() !!}
好了，這樣在頁面應(yīng)該就可以看到分頁鏈接中含有 "上一頁"和"下一頁"加數(shù)字的樣式了。
那么如果擴(kuò)展simplePaginate?其實很簡單，只要繼承剛才的 CustomerPresenter ，實現(xiàn) hasPages 和 render ,至于為什么可以按照我上面查看源碼的方式看一下就知道了，比如我們改成"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'),
$this->getNextButton('下一篇')
));
}
return '';
}
}
分頁顯示：
{!! with(new \App\Foundations\Pagination\CustomerSimplePresenter($categories))->render() !!}
方法就是這個方法，具體修改按照自己需求重寫其中對應(yīng)的顯示html元素的方法就可以了。
以上就是本文的全部內(nèi)容，希望對大家學(xué)習(xí)PHP程序設(shè)計有所幫助。
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