Analysis on adding js event paging class customPage.class.php to thinkPHP framework

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Think;
class customPage{
  public $firstRow; // 起始行数
  public $listRows; // 列表每页显示行数
  public $parameter; // 分页跳转时要带的参数
  public $totalRows; // 总行数
  public $totalPages; // 分页总页面数
  public $rollPage  = 6;// 分页栏每页显示的页数
  public $lastSuffix = true; // 最后一页是否显示总页数
  private $p    = &#39;p&#39;; //分页参数名
  private $url   = &#39;&#39;; //当前链接URL
  private $nowPage = 1;
  // 分页显示定制
  private $config = array(
    &#39;header&#39; => &#39;<span class="rows">共 %TOTAL_ROW% 条记录</span>&#39;,
    &#39;prev&#39;  => &#39;上一页&#39;,
    &#39;next&#39;  => &#39;下一页&#39;,
    &#39;first&#39; => &#39;1...&#39;,
    &#39;last&#39;  => &#39;...%TOTAL_PAGE%&#39;,
    &#39;theme&#39; => &#39;%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%&#39;,
  );
  /**
   * 架构函数
   * @param array $totalRows 总的记录数
   * @param array $listRows 每页显示记录数
   * @param array $parameter 分页跳转的参数
   */
  public function __construct($totalRows, $listRows=20, $parameter = array()) {
    C(&#39;VAR_PAGE&#39;) && $this->p = C(&#39;VAR_PAGE&#39;); //设置分页参数名称
    /* 基础设置 */
    $this->totalRows = $totalRows; //设置总记录数
    $this->listRows  = $listRows; //设置每页显示行数
    $this->parameter = empty($parameter) ? $_GET : $parameter;
    $this->nowPage  = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
    $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
    if ($this->nowPage>$this->totalPages) {
      $this->nowPage = $this->totalPages ;
    }
    $this->nowPage  = $this->nowPage>0 ? $this->nowPage : 1;
    $this->firstRow  = $this->listRows * ($this->nowPage - 1);
  }
  /**
   * 定制分页链接设置
   * @param string $name 设置名称
   * @param string $value 设置值
   */
  public function setConfig($name,$value) {
    if(isset($this->config[$name])) {
      $this->config[$name] = $value;
    }
  }
  /**
   * 生成链接URL
   * @param integer $page 页码
   * @return string
   */
  private function url($page){
    return str_replace(urlencode(&#39;[PAGE]&#39;), $page, $this->url);
  }
  /**
   * 组装分页链接
   * @return string
   */
  public function show() {
    if(0 == $this->totalRows) return &#39;&#39;;
    /* 生成URL */
    $this->parameter[$this->p] = &#39;[PAGE]&#39;;
    $this->url = U(ACTION_NAME, $this->parameter);
    /* 计算分页信息 */
    if(!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
      $this->nowPage = $this->totalPages;
    }
    /* 计算分页临时变量 */
    $now_cool_page   = $this->rollPage/2;
    $now_cool_page_ceil = ceil($now_cool_page);
    $this->lastSuffix && $this->config[&#39;last&#39;] = $this->totalPages;
    //上一页
    $up_row = $this->nowPage - 1;
    $up_page = $up_row > 0 ? &#39;<a class="shang" id="&#39;.$up_row.&#39;"href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a>&#39; : &#39;&#39;;
    //下一页
    $down_row = $this->nowPage + 1;
    $down_page = ($down_row <= $this->totalPages) ? &#39;<a class="xia" id="&#39;.$down_row.&#39;" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a>&#39; : &#39;&#39;;
    //第一页
    $the_first = &#39;&#39;;
    if($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1){
      $the_first = &#39;<a class="first" id="1" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >第一页</a>&#39;;
    }
    //最后一页
    $the_end = &#39;&#39;;
    //if($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages){
    if($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages){
      $the_end = &#39;<a class="end" id="&#39;.$this->totalRows.&#39;" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >最后一页</a>&#39;;
    }
    for($i = 1; $i <= $this->rollPage; $i++){
        if(($this->nowPage - $now_cool_page) <= 0 ){
          $page = $i;
        }elseif(($this->nowPage + $now_cool_page - 1) >= $this->totalPages){
          $page = $this->totalPages - $this->rollPage + $i;
        }else{
          $page = $this->nowPage - $now_cool_page_ceil + $i;
        }
        if($page > 0 && $page != $this->nowPage){
          if($page <= $this->totalPages){
            $link_page .= (&#39;<li id="&#39;.$page.&#39;">&#39;.$page.&#39;</li>&#39;);
          }else{
            break;
          }
        }else{
          if($page > 0 && $this->totalPages != 1){
            $link_page .= (&#39;<li id="now" id="&#39;.$page.&#39;" class="current">&#39;.$page.&#39;</li>&#39;);
          }
        }
    }
    if (!empty($link_page)) $link_page = &#39;<ul id="list">&#39;.$link_page.&#39;</ul>&#39;;
    //替换分页内容
    $page_str = str_replace(
      array(&#39;%HEADER%&#39;, &#39;%NOW_PAGE%&#39;, &#39;%UP_PAGE%&#39;, &#39;%DOWN_PAGE%&#39;, &#39;%FIRST%&#39;, &#39;%LINK_PAGE%&#39;, &#39;%END%&#39;, &#39;%TOTAL_ROW%&#39;, &#39;%TOTAL_PAGE%&#39;),
      array($this->config[&#39;header&#39;], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages),
      $this->config[&#39;theme&#39;]);
    $page_str = trim($page_str);
    if(!empty($page_str)) $page_str .= &#39;<p></p><input value="" type="text"><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="go" class="go">跳转</a>&#39;;
    return $page_str;
  }
}