PHP ajax 分页类代码

<?php
//本分页类不处理SQL;
//大大的加快了分页功能
//http://blog.csdn.net/fkedwgwy
//潇湘博客--潇湘
/*
演示
require_once('../libs/classes/page.class.php');
$page=new page(array('total'=>1000,'perpage'=>20));
echo 'mode:1
'.$page->show();
echo '

---

mode:2
'.$page->show(2);
echo '

---

mode:3
'.$page->show(3);
echo '

---

mode:4
'.$page->show(4);
echo '

---

开始AJAX模式:';
$ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
echo 'mode:1
'.$ajaxpage->show();
/
class Zend_Page
{
/**

• config ,public
  */
  var $page_name="page";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
  var $next_page='>';//下一页
  var $pre_page='<';//上一页
  var $first_page='First';//首页
  var $last_page='Last';//尾页
  var $pre_bar='<<';//上一分页条
  var $next_bar='>>';//下一分页条
  var $format_left='';
  var $format_right='';
  var $is_ajax=false;//是否支持AJAX分页模式
  var $next_ten_page=">>>";
  var $per_ten_page="<<<";

/**

• private

• */
  var $pagebarnum=10;//控制记录条的个数。
  var $totalpage=0;//总页数
  var $ajax_action_name='';//AJAX动作名
  var $nowindex=1;//当前页
  var $url="";//url地址头
  var $offset=0;
  var $total='';

/**

• constructor构造函数
• @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
  /
  function Zend_Page($array)
  {
  if(is_array($array)){
  if(!array_key_exists('total',$array))$this->error(FUNCTION,'need a param of total');
  $total=intval($array['total']);
  $perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;
  $nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
  $url=(array_key_exists('url',$array))?$array['url']:'';
  }else{
  $total=$array;
  $perpage=10;
  $nowindex='';
  $url='';
  }
  if((!is_int($total))||($total<0))$this->error(FUNCTION,$total.' is not a positive integer!');
  if((!is_int($perpage))||($perpage<=0))$this->error(FUNCTION,$perpage.' is not a positive integer!');
  if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
  $this->_set_nowindex($nowindex);//设置当前页
  $this->_set_url($url);//设置链接地址
  $this->totalpage=ceil($total/$perpage);
  $this->total=$total;
  $this->offset=($this->nowindex-1)$perpage;
  if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
  }
  /**
• 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
• @param string $var
• @param string $value
  */
  function set($var,$value)
  {
  if(in_array($var,get_object_vars($this)))
  $this->$var=$value;
  else {
  $this->error(FUNCTION,$var." does not belong to PB_Page!");
  }

}
/**

• 打开倒AJAX模式
• @param string $action 默认ajax触发的动作。
  */
  function open_ajax($action)
  {
  $this->is_ajax=true;
  $this->ajax_action_name=$action;
  }
  /**
• 获取显示"下一页"的代码
• @param string $style
• @return string
  */
  function next_page($style='')
  {
  if($this->nowindex<$this->totalpage){
  return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
  }
  return ''.$this->next_page.'';
  }

/**

• 获取显示"上一页"的代码
• @param string $style
• @return string
  */
  function pre_page($style='')
  {
  if($this->nowindex>1){
  return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
  }
  return ''.$this->pre_page.'';
  }

/**

• 获取显示"上十页"的代码
• @param string $style
• @return string
  /
  function pre_ten_page($style='')
  {
  if(intval($this->nowindex/10)+1>1){
  return $this->_get_link($this->_get_url(intval($this->nowindex/10)10-5),$this->pre_ten_page,$style);
  }
  return ''.$this->pre_ten_page.'';
  }

/**

• 获取显示"下十页"的代码
• @param string $style
• @return string
  /
  function next_ten_page($style='')
  {
  if(intval($this->nowindex/10) <intval($this->totalpage/10)){
  return $this->_get_link($this->_get_url((intval($this->nowindex/10)+1)10+5),$this->next_ten_page,$style);
  }
  return ''.$this->next_ten_page.'';
  }

/**

• 获取显示"首页"的代码
• @return string
  */
  function first_page($style='')
  {
  if($this->nowindex==1){
  return ''.$this->first_page.'';
  }
  return $this->_get_link($this->_get_url(1),$this->first_page,$style);
  }

/**

• 获取显示"尾页"的代码
• @return string
  */
  function last_page($style='')
  {
  if($this->nowindex==$this->totalpage){
  return ''.$this->last_page.'';
  }
  return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
  }

function nowbar($style='',$nowindex_style='')
{
$plus=ceil($this->pagebarnum/2);
if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
$begin=$this->nowindex-$plus+1;
$begin=($begin>=1)?$begin:1;
$return='';
for($i=$begin;$i<$begin+$this->pagebarnum;$i++)
{
if($i<=$this->totalpage){
if($i!=$this->nowindex)
$return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style));
else
$return.=$this->_get_text(''.$i.'');
}else{
break;
}
$return.="\n";
}
unset($begin);
return $return;
}
/**

• 获取显示跳转按钮的代码
• @return string
  */
  function select()
  {
  $return='';
  for($i=1;$i<=$this->totalpage;$i++)
  {
  if($i==$this->nowindex){
  $return.=''.$i.'';
  }else{
  $return.=''.$i.'';
  }
  }
  unset($i);
  $return.='';
  return $return;
  }

/**

• 获取mysql 语句中limit需要的值
• @return string
  */
  function offset()
  {
  return $this->offset;
  }

/**

• 控制分页显示风格（你可以增加相应的风格）
• @param int $mode
• @return string
  */
  function show($mode=1,$url='')
  {
  switch ($mode)
  {
  case '1':
  $this->next_page='下一页';
  $this->pre_page='上一页';
  return $this->pre_page().$this->nowbar().$this->next_page().'第'.$this->select().'页';
  break;
  case '2':
  $this->next_page='下一页';
  $this->pre_page='上一页';
  $this->first_page='首页';
  $this->last_page='尾页';
  return $this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';
  break;
  case '3':
  $this->next_page='下一页';
  $this->pre_page='上一页';
  $this->first_page='首页';
  $this->last_page='尾页';
  return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
  break;
  case '4':
  $this->next_page='next';
  $this->pre_page='last';
  return $this->pre_page().$this->nowbar().$this->next_page();
  break;
  case '5':
  return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
  break;
  case '6':
  //启用了"上一页"，"下一页"，"最后一页"。可根据情况启用"第一页"。
  //$this->first_page='';
  $this->pre_page='';
  $this->next_page='';
  $this->last_page='最后一页';
  //return "".$this->select().""."页"."".$this->first_page().""."".$this->pre_page().""."".$this->next_page().""."".$this->last_page()."";
  return "共有[".$this->total."]件商品 ".$this->nowindex."/".$this->totalpage."页"."".$this->pre_page()." ".$this->next_page().""."".$this->last_page()." ".$this->select()." 页 ";
  break;
  case '7':
  $this->next_page='';
  $this->pre_page='';
  $this->first_page='';
  $this->last_page='';
  if($this->totalpage==0)
  {$this->nowindex=0;}
  return $this->first_page()." ".$this->pre_page()." ".$this->next_page()." ".$this->last_page()." ".$this->select();
  break;
  case '8':
  //启用了"上一页"，"下一页"，"最后一页"。可根据情况启用"第一页"。
  //$this->first_page='';
  $this->pre_page='';
  $this->next_page='';
  $this->last_page='最后一页';
  if($this->totalpage==0)
  {$this->nowindex=0;}
  //return "".$this->select().""."页"."".$this->first_page().""."".$this->pre_page().""."".$this->next_page().""."".$this->last_page()."";
  return "共有[".$this->total."]条信息 ".$this->nowindex."/".$this->totalpage."页"."".$this->pre_page()." ".$this->next_page().""."".$this->last_page()." ".$this->select()." 页 ";
  break;
  }

}
/----------------private function (私有方法)-----------------------------------------------------------/
/**

• 设置url头地址
• @param: String $url
• @return boolean
  */
  function _set_url($url="")
  {
  if(!empty($url)){
  //手动设置
  $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
  }else{
  //自动获取
  if(empty($_SERVER['QUERY_STRING'])){
  //不存在QUERY_STRING时
  $this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
  }else{
  //
  if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
  //地址存在页面参数
  $this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
  $last=$this->url[strlen($this->url)-1];
  if($last=='?'||$last=='&'){
  $this->url.=$this->page_name."=";
  }else{
  $this->url.='&'.$this->page_name."=";
  }
  }else{
  //
  $this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
  }//end if
  }//end if
  }//end if
  }

/**

• 设置当前页面

• */
  function _set_nowindex($nowindex)
  {
  if(empty($nowindex)){
  //系统获取

if(isset($_GET[$this->page_name])){
$this->nowindex=intval($_GET[$this->page_name]);
}
}else{
//手动设置
$this->nowindex=intval($nowindex);
}
}

/**

• 为指定的页面返回地址值
• @param int $pageno
• @return string $url
  */
  function _get_url($pageno=1)
  {
  return $this->url.$pageno;
  }

/**

• 获取分页显示文字，比如说默认情况下_get_text('1')将返回[1]
• @param String $str
• @return string $url
  */
  function _get_text($str)
  {
  return $this->format_left.$str.$this->format_right;
  }

/**

• 获取链接地址
  */
  function _get_link($url,$text,$style=''){
  $style=(empty($style))?'':'class="'.$style.'"';
  if($this->is_ajax){
  //如果是使用AJAX模式
  return '<a '.$style.' href="javascript:'.$this->ajax_action_name.'(\''.$url.'\')">'.$text.'';
  }else{
  return '<a '.$style.' href="'.$url.'">'.$text.'';
  }
  }
  /**
• 出错处理方式
  */
  function error($function,$errormsg)
  {
  die('Error in file '.FILE.' ,Function '.$function.'() :'.$errormsg);
  }
  }
  ?>