Laravel5.5 手动分页和自定义分页样式的简单实现
编程学习 2021-07-04 23:05www.dzhlxh.cn编程入门
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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。
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