Laravel5.5 手动分页和自定义分页样式

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  • Post category:其他


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='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."&page=".$i.">".$i."</a></li>";
                }else{
                    $pages .="<li><a href=".$this->path."&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."&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."&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=".$this->path."&page=".$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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