CI框架简单分页类用法示例

本文实例讲述了CI框架简单分页类用法。分享给大家供大家参考，具体如下：

/**
 *
 * 关于 页码有效性的判断需要加在 控制器中判断，即当页码数<1或者>总页数
 *
 */
class Custom_pagination
{
  var $page_url = ''; //分页目标URL
  var $page_size = 10; //每一页行数
  var $page_num = 1;//页码
  var $rows_num= '';//数据总行数
  var $links_num= 3;//选中链接前后的链接数，必须大于等于1 

  var $anchor_class= '';//链接样式类
  var $current_class= '';//当前页样式类
  var $full_tag_open= '';//分页开始标签
  var $full_tag_close= '';//分页结束标签
  var $info_tag_open= '';
  var $info_tag_close= ' ';
  var $first_tag_open= '';
  var $first_tag_close= ' ';
  var $last_tag_open= ' ';
  var $last_tag_close= '';
  var $cur_tag_open= ' <strong>';
  var $cur_tag_close= '</strong>';
  var $next_tag_open= ' ';
  var $next_tag_close= ' ';
  var $prev_tag_open= ' ';
  var $prev_tag_close= '';
  var $num_tag_open= ' ';
  var $num_tag_close= ''; 

  public function __construct($params = array())
  {
    if (count($params) > 0)
    {
      $this->init($params);
    }
  } 

  function init($params = array()) //初始化数据
  {
    if (count($params) > 0)
    {
      foreach ($params as $key => $val)
      {
        if (isset($this->$key))
        {
          $this->$key = $val;
        }
      }
    }
  } 

  function create_links()
  {
    ///////////////////////////////////////////////////////
    //准备数据
    ///////////////////////////////////////////////////////
    $page_url = $this->page_url;
    $rows_num = $this->rows_num;
    $page_size = $this->page_size;
    $links_num = $this->links_num; 

    if ($rows_num == 0 OR $page_size == 0)
    {
      return '';
    } 

    $pages = intval($rows_num/$page_size);
    if ($rows_num % $page_size)
    {
      //有余数pages+1
      $pages++;
    };
    $page_num = $this->page_num < 1 ? '1' : $this->page_num; 

    $anchor_class = '';
    if($this->anchor_class !== '')
    {
      $anchor_class = 'class="'.$this->anchor_class.'" ';
    } 

    $current_class = '';
    if($this->current_class !== '')
    {
      $current_class = 'class="'.$this->current_class.'" ';
    }
    if($pages == 1)
    {
      return '';
    }
    if($links_num < 0)
    {
      return '- -！links_num必须大于等于0';
    }
    ////////////////////////////////////////////////////////
    //创建链接开始
    ////////////////////////////////////////////////////////
    $output = $this->full_tag_open;
    $output .= $this->info_tag_open.'共'.$rows_num.'条数据 第 '.$page_num.'/'.$pages.' 页'.$this->info_tag_close;
    //首页
    if($page_num > 1)
    {
      $output .= $this->first_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url).'" rel="external nofollow" >首页</a>'.$this->first_tag_close;
    }
    //上一页
    if($page_num > 1)
    {
      $n = $page_num - 1;
      $output .= $this->prev_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" rel="external nofollow" rel="external nofollow" >上一页</a>'.$this->prev_tag_close;
    }
    //pages
    for($i=1;$i<=$pages;$i++)
    {
      $pl = $page_num - $links_num < 0 ? 0 : $page_num - $links_num;
      $pr = $page_num + $links_num > $pages ? $pages : $page_num + $links_num;
      //判断链接个数是否太少，举例，假设links_num = 2，则链接个数不可少于 5 个，主要是 当page_num 等于 1， 2 和 n，n-1的时候
      if($pr < 2 * $links_num + 1)
      {
        $pr = 2 * $links_num + 1;
      }
      if($pl > $pages-2 * $links_num)
      {
        $pl = $pages - 2 * $links_num;
      }
      if($i == $page_num)
      {  //current page
        $output .= $this->cur_tag_open.'<span '.$current_class.' >'.$i.'</span>'.$this->cur_tag_close;
      }else if($i >= $pl && $i <= $pr)
      {
        $output .= $this->num_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$i).'" rel="external nofollow" >'.$i.'</a>'.$this->num_tag_close;
      }
    }
    //下一页
    if($page_num < $pages)
    {
      $n = $page_num + 1;
      $output .= $this->next_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$n).'" rel="external nofollow" rel="external nofollow" >下一页</a>'.$this->next_tag_close;
    }
    //末页
    if($page_num < $pages)
    {
      $output .= $this->last_tag_open.'<a '.$anchor_class.' href="'.site_url($page_url.'/'.$pages).'" rel="external nofollow" >末页</a>'.$this->last_tag_close;
    } 

    $output.=$this->full_tag_close;
    return $output;
  }
}

控制器里调用

$config['page_url']
= 'about/science';
$config['page_size'] = $pagesize;
$config['rows_num'] = $num_rows;
$config['page_num'] = $page;
$this->load->library('Custom_pagination');
$this->custom_pagination->init($config);
echo $this->custom_pagination->create_links();

<?php
class page{ 

  public $page; //当前页
  public $pagenum; // 页数
  public $pagesize; // 每页显示条数
  public function __construct($count, $pagesize){
    $this->pagenum = ceil($count/$pagesize);
    $this->pagesize = $pagesize;
    $this->page =(isset($_GET['p'])&&$_GET['p']>0) ? intval($_GET['p']) : 1;
  }
  /**
   * 获得 url 后面GET传递的参数
   */
  public function getUrl(){
    $url = 'index.php?'.http_build_query($_GET);
    $url = preg_replace('/[?,&]p=(\w)+/','',$url);
    $url .= (strpos($url,"?") === false) ? '?' : '&';
    return $url;
  }
  /**
   * 获得分页HTML
   */
  public function getPage(){
    $url = $this->getUrl();
    $start = $this->page-5;
    $start=$start>0 ? $start : 1;
    $end  = $start+9;
    $end = $end<$this->pagenum ? $end : $this->pagenum;
    $pagestr = '';
    if($this->page>5){
      $pagestr = "<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=1".">首页</a> ";
    }
    if($this->page!=1){
      $pagestr.= "<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".($this->page-1).">上一页</a>";
    } 

    for($i=$start;$i<=$end;$i++){
      $pagestr.= "<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".$i.">".$i."</a> ";
    }
    if($this->page!=$this->pagenum){
      $pagestr.="<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".($this->page+1).">下一页</a>"; 

    }
    if($this->page+5<$this->pagenum){
      $pagestr.="<a href=".$url." rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" p=".$this->pagenum.">尾页</a> ";
    }
    return $pagestr;
  } 

}
// 测试代码
$page = new page(100,10);
$str=$page->getPage();
echo $str;
?>

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