AJAX模式下的分页

AJAX模式下的分页

<?php
/**
演示
require_once(&#39;../libs/classes/page.class.php&#39;);
$page=new page(array(&#39;total&#39;=>1000,&#39;perpage&#39;=>20));
echo &#39;mode:1<br>&#39;.$page->show();
echo &#39;<hr>mode:2<br>&#39;.$page->show(2);
echo &#39;<hr>mode:3<br>&#39;.$page->show(3);
echo &#39;<hr>mode:4<br>&#39;.$page->show(4);
echo &#39;<hr>开始AJAX模式:&#39;;
$ajaxpage=new page(array(&#39;total&#39;=>1000,&#39;perpage&#39;=>20,&#39;ajax&#39;=>&#39;ajax_page&#39;,&#39;page_name&#39;=>&#39;test&#39;));
echo &#39;mode:1<br>&#39;.$ajaxpage->show();
*/
class minupage
{
/**
* config ,public
*/
var $page_name="p";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
var $next_page=&#39;>&#39;;//下一页
var $pre_page=&#39;<&#39;;//上一页
var $first_page=&#39;First&#39;;//首页
var $last_page=&#39;Last&#39;;//尾页
var $pre_bar=&#39;<<&#39;;//上一分页条
var $next_bar=&#39;>>&#39;;//下一分页条
var $format_left=&#39;[&#39;;
var $format_right=&#39;]&#39;;
var $is_ajax=false;//是否支持AJAX分页模式

/**
* private
*
*/
var $pagebarnum=10;//控制记录条的个数。
var $totalpage=0;//总页数
var $ajax_action_name=&#39;&#39;;//AJAX动作名
var $nowindex=1;//当前页
var $url="";//url地址头
var $offset=0;

/**
* constructor构造函数
*
* @param array $array[&#39;total&#39;],$array[&#39;perpage&#39;],$array[&#39;nowindex&#39;],$array[&#39;url&#39;],$array[&#39;ajax&#39;]...
*/
function minupage($array)
{
if(is_array($array)){
     if(!array_key_exists(&#39;total&#39;,$array))$this->error(__FUNCTION__,&#39;need a param of total&#39;);
     $total=intval($array[&#39;total&#39;]);
     $perpage=(array_key_exists(&#39;perpage&#39;,$array))?intval($array[&#39;perpage&#39;]):10;
     $nowindex=(array_key_exists(&#39;nowindex&#39;,$array))?intval($array[&#39;nowindex&#39;]):&#39;&#39;;
     $url=(array_key_exists(&#39;url&#39;,$array))?$array[&#39;url&#39;]:&#39;&#39;;
}else{
     $total=$array;
     $perpage=10;
     $nowindex=&#39;&#39;;
     $url=&#39;&#39;;
}
if((!is_int($total))||($total<0))$this->error(__FUNCTION__,$total.&#39; is not a positive integer!&#39;);
if((!is_int($perpage))||($perpage<=0))$this->error(__FUNCTION__,$perpage.&#39; is not a positive integer!&#39;);
if(!empty($array[&#39;page_name&#39;]))$this->set(&#39;page_name&#39;,$array[&#39;page_name&#39;]);//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);
$this->offset=($this->nowindex-1)*$perpage;
if(!empty($array[&#39;ajax&#39;]))$this->open_ajax($array[&#39;ajax&#39;]);//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=&#39;&#39;)
{
if($this->nowindex<$this->totalpage){
   return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
}
return &#39;<span class="&#39;.$style.&#39;">&#39;.$this->next_page.&#39;</span>&#39;;
}

/**
* 获取显示“上一页”的代码
*
* @param string $style
* @return string
*/
function pre_page($style=&#39;&#39;)
{
if($this->nowindex>1){
   return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
}
return &#39;<span class="&#39;.$style.&#39;">&#39;.$this->pre_page.&#39;</span>&#39;;
}

/**
* 获取显示“首页”的代码
*
* @return string
*/
function first_page($style=&#39;&#39;)
{
if($this->nowindex==1){
      return &#39;<span class="&#39;.$style.&#39;">&#39;.$this->first_page.&#39;</span>&#39;;
}
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($style=&#39;&#39;)
{
if($this->nowindex==$this->totalpage){
      return &#39;<span class="&#39;.$style.&#39;">&#39;.$this->last_page.&#39;</span>&#39;;
}
return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
}

function nowbar($style=&#39;&#39;,$nowindex_style=&#39;&#39;)
{
$plus=ceil($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;
$return=&#39;&#39;;
for($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(&#39;<span class="&#39;.$nowindex_style.&#39;">&#39;.$i.&#39;</span>&#39;);
   }else{
    break;
   }
   $return.="\n";
}
unset($begin);
return $return;
}
/**
* 获取显示跳转按钮的代码
*
* @return string
*/
function select($url)
{
$return=&#39;<select name=";PB_Page_Select" >&#39;;
for($i=1;$i<=$this->totalpage;$i++)
{
   if($i==$this->nowindex){
    $return.=&#39;<option value=&#39;.$url.$i.&#39; selected>&#39;.$i.&#39;</option>&#39;;
   }else{
    $return.=&#39;<option value=&#39;.$url.$i.&#39;>&#39;.$i.&#39;</option>&#39;;
   }
}
unset($i);
$return.=&#39;</select>&#39;;
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,$url=&#39;&#39;)
{
switch ($mode)
{
   case &#39;1&#39;:
    $this->next_page=&#39;下一页&#39;;
    $this->pre_page=&#39;上一页&#39;;
    return $this->pre_page().$this->nowbar().$this->next_page().&#39;第&#39;.$this->select($url).&#39;页&#39;;
    break;
   case &#39;2&#39;:
    $this->next_page=&#39;下一页&#39;;
    $this->pre_page=&#39;上一页&#39;;
    $this->first_page=&#39;首页&#39;;
    $this->last_page=&#39;尾页&#39;;
    return $this->first_page().$this->pre_page().&#39;[第&#39;.$this->nowindex.&#39; 页]&#39;.
    $this->next_page().$this->last_page().&#39;第 &#39;.$this->select($url).&#39;页&#39;;
    break;
   case &#39;3&#39;:
    $this->next_page=&#39;下一页&#39;;
    $this->pre_page=&#39;上一页&#39;;
    $this->first_page=&#39;首页&#39;;
    $this->last_page=&#39;尾页&#39;;
    return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
    break;
   case &#39;4&#39;:
    $this->next_page=&#39;下一页&#39;;
    $this->pre_page=&#39;上一页&#39;;
    return $this->pre_page().$this->nowbar().$this->next_page();
    break;
   case &#39;5&#39;:
    return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
    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($url,&#39;?&#39;))?&#39;&&#39;:&#39;?&#39;).$this->page_name."=";
}else{
      //自动获取
   if(empty($_SERVER[&#39;QUERY_STRING&#39;])){
       //不存在QUERY_STRING时
    $this->url=$_SERVER[&#39;REQUEST_URI&#39;]."?".$this->page_name."=";
   }else{
       //
    if(stristr($_SERVER[&#39;QUERY_STRING&#39;],$this->page_name.&#39;=&#39;)){
        //地址存在页面参数
     $this->url=str_replace($this->page_name.&#39;=&#39;.$this->nowindex,&#39;&#39;,$_SERVER[&#39;REQUEST_URI&#39;]);
     $last=$this->url[strlen($this->url)-1];
     if($last==&#39;?&#39;||$last==&#39;&&#39;){
         $this->url.=$this->page_name."=";
     }else{
         $this->url.=&#39;&&#39;.$this->page_name."=";
     }
    }else{
        //
     $this->url=$_SERVER[&#39;REQUEST_URI&#39;].&#39;&&#39;.$this->page_name.&#39;=&#39;;
    }//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(&#39;<a href="">1</a>&#39;)将返回[<a href="">1</a>]
*
* @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=&#39;&#39;){
$style=(empty($style))?&#39;&#39;:&#39;class="&#39;.$style.&#39;"&#39;;
if($this->is_ajax){
      //如果是使用AJAX模式
   return &#39;<a &#39;.$style.&#39; href="javascript:&#39;.$this->ajax_action_name.&#39;(\&#39;&#39;.$url.&#39;\&#39;)">&#39;.$text.&#39;</a>&#39;;
}else{
   return &#39;<a &#39;.$style.&#39; href="&#39;.$url.&#39;">&#39;.$text.&#39;</a>&#39;;
}
}
/**
   * 出错处理方式
*/
function error($function,$errormsg)
{
     die(&#39;Error in file <b>&#39;.__FILE__.&#39;</b> ,Function <b>&#39;.$function.&#39;()</b> :&#39;.$errormsg);
}
}
?>

                   

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