Laravel 的分頁很方便，其實(shí)擴(kuò)展起來也挺容易的，下面就來做個(gè)示例，擴(kuò)展一下 paginate() 和 simplePaginate() 方法，來實(shí)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(gè)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(duì)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(gè) paginate 是如何實(shí)現(xiàn) render() 的,
Illuminate/Pagination/LengthAwarePaginator.php
<?phpnamespace 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(gè) Presenter 的實(shí)例，并調(diào)用這個(gè)實(shí)例化的 render 方法來實(shí)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
<?phpnamespace 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(shí)現(xiàn)了 PresenterContract 的接口， render() 才是分頁顯示的真正實(shí)現(xiàn)，構(gòu)造方法中的第一個(gè)參數(shù) PaginatorContract 其實(shí)就是一個(gè) 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(shí)現(xiàn)
illuminate/contracts/Pagination/Presenter.php
<?phpnamespace 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(shí)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(gè)我們自己的 Presenter 來實(shí)現(xiàn)接口中的 render() 和 hasPages() 就可以了。
首先就來簡(jiǎn)單的實(shí)現(xiàn)一個(gè)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(gè)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(shí)現(xiàn)可以查看該方法 $this->getLinks(), $this->getNextButton('下一頁')//具體實(shí)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(jiǎn)單，主要就是 render() 方法，如果項(xiàng)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(xiàng)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(shí)很簡(jiǎn)單，只要繼承剛才的 CustomerPresenter ，實(shí)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(gè)方法，具體修改按照自己需求重寫其中對(duì)應(yīng)的顯示html元素的方法就可以了。
轉(zhuǎn)載請(qǐng)注明：轉(zhuǎn)載自 Ryan是菜鳥 | LNMP技術(shù)棧筆記
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家學(xué)習(xí)PHP程序設(shè)計(jì)有所幫助。
