基于Laravel5.5 在項(xiàng)目實(shí)施過程中，需要對從接口中獲取的數(shù)據(jù)（或者通過搜索工具查詢出來的數(shù)據(jù)）進(jìn)行分頁
一、創(chuàng)建手動分頁
在laravel自帶的分頁中，一般是通過數(shù)據(jù)庫查詢訪問paginate()方法來達(dá)到分頁的效果 ，like this：
class IndexControllerextends Controller
{
publicfunctionindex()
{
$person = DB::table('person')->paginate(15);
return view('index.pagTest',['person'=> $person]);
}
}
查看框架的分頁源代碼
#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,
]);
}
發(fā)現(xiàn)，分頁用了 \Illuminate\Contracts\Pagination\LengthAwarePaginator 構(gòu)造方法，查看這個構(gòu)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);
}
如果要實(shí)現(xiàn)手動分頁，只需要使用這個構(gòu)造方法，給定參數(shù)，就能達(dá)到分頁的效果
貼代碼：
public function setPage2(Request $request,$data,$prepage,$total){
#每頁顯示記錄
$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 為需要進(jìn)行分頁的數(shù)據(jù)）
說明：
1、在考慮到代碼的復(fù)用性，我將分頁代碼封裝到app/Controllers/Controller.php中的一個方法里面，這樣在其他控制器里只需要$this->setPage(Request $request,$data,$prepage,$total) 就能使用了，（前提：其他控制器繼承了Controller.php）
2、分頁的URL，因?yàn)槲业捻?xiàng)目的url一定會攜帶一個kw參數(shù)，所以我直接用str_replace替換"page",如果是存在不攜參分頁的話，需要判斷，到底是"?page"還是"page"。（url的邏輯可以自己寫）
#分頁 php
$paginator = $this->setPage2($request,$data,25,$sum);
$data =$paginator->toArray()['data'];
在模板中：{{$paginator->render()}}即能輸出分頁HTML，樣式如下：
二、自定義分頁樣式
在實(shí)際開發(fā)中，不希望用戶在瀏覽時直接瀏覽最后幾頁，只想用戶從前往后依次的瀏覽，如百度搜索分頁，這時候，就想修改分頁的樣式，經(jīng)過一個下午的奮戰(zhàn)，貼出解決過程
在上一環(huán)節(jié)中，手動創(chuàng)建了分頁，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());
}
經(jīng)過思考，我們不去改laravel框架的源代碼，可以通過重構(gòu)render方法或者重新定義一個生成HTML模板的方法來實(shí)現(xiàn)自定義HTML模板
因?yàn)槲覀冎恍枰远xHTML模板，所以，可以創(chuàng)建一個文件，繼承\(zhòng)Illuminate\Contracts\Pagination\LengthAwarePaginator 類
看代碼：
?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; //默認(rèn)顯示分頁數(shù)
public $pageHtml;
public function newrender(){
if($this->hasPages())
{
return sprintf("ul class='pagination'>%s %s %s/ul>",
$this->pre_page(),
$this->pages_num(),
$this->next_page()
);
}
}
#上一頁
public function pre_page(){
if($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>";
}
}
#頁碼
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{
#當(dāng)前頁前邊部分
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>";
}
#當(dāng)前頁
$pages .= "li class='active'>span>".$this->currentPage."/span>/li>";
#當(dāng)前頁后邊部分
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 $pages;
}
#下一頁
public function next_page(){
if($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>";
}
}
}
我選擇的方法是自定義新的方法生成HTML模板，模板中通過：{{$paginator->newrender()}}輸出HTML
如果選擇重構(gòu)render()方法，只需要將上面的newrender()方法做一些小變動
public function render($view=null,$data=[]){
if($this->hasPages())
{
return sprintf("ul class='pagination'>%s %s %s/ul>",
$this->pre_page(),
$this->pages_num(),
$this->next_page()
);
}
}
模板中通過：{{$paginator->render()}}輸出HTML
最終效果如圖：
注意：自定義HTML后因?yàn)樾陆艘粋€類繼承了LengthAwarePaginator類，需要將第一步手動分頁的方法中new LengthAwarePaginator 修改為 new Newpage 參數(shù)不變。
以上這篇Laravel5.5 手動分頁和自定義分頁樣式的簡單實(shí)現(xiàn)就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持腳本之家。
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