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| /**
Example:
$page = (isset($this->params['named']['page'])) ? $this->params['named']['page'] : 1;
// 导入分页类
App::import('Vendor', 'page_class');
// 获取公告总数
$total = $this->Bulletin->getBulletinTotal();
$perpage = ITEMPREPAGE;
$offset = $perpage * ($page - 1);
$pagebar = new Pagebar($total, $page, $offset, $perpage);
$pagenav = $pagebar->construct_page_nav($total, $page, SYSTEMURL . '/bulletins/index', null, null);
*/
<?php
class Pagebar
{
var $perpage = 20;
/**
* Ensures that the variables for a multi-page display are sane
*
* @param integer Total number of items to be displayed
* @param integer (ref) Current page number
* @param integer (ref) Desired number of results to show per-page
*/
function Pagebar($numresults, &$page, &$limitlower, $perpage)
{
$this->perpage = $perpage;
$numpages = ceil($numresults / $this->perpage);
if ($numpages == 0)
{
$numpages = 1;
}
if ($page < 1)
{
$page = 1;
}
else if ($page > $numpages)
{
$page = $numpages;
}
$limitlower = ($page - 1) * $this->perpage;
$limitupper = ($page) * $this->perpage;
if ($limitupper > $numresults)
{
$limitupper = $numresults;
if ($limitlower > $numresults)
{
$limitlower = ($numresults - $this->perpage) - 1;
}
}
if ($limitlower < 0)
{
$limitlower = 0;
}
}
/**
* Returns the HTML for multi-page navigation
*
* @param integer Total number of items found
* @param integer Page number being displayed
* @param string Base address for links eg: q.php?t=99{&page=4}
* @param string Ending portion of address for links
*
* @return string Page navigation HTML
*/
function construct_page_nav($results, $pagenumber, $address, $address2 = '', $option = array())
{
$perpage = $this->perpage;
$show = array();
$curpage = 0;
$pagenav = '';
$firstlink = '';
$prevlink = '';
$lastlink = '';
$nextlink = '';
if ($results <= $perpage)
{
$show['pagenav'] = false;
return '';
}
$show['pagenav'] = true;
$total = number_format($results);
$totalpages = ceil($results / $perpage);
$show['prev'] = false;
$show['next'] = false;
$show['first'] = false;
$show['last'] = false;
if ($pagenumber > 1)
{
$prevpage = $pagenumber - 1;
$prevnumbers = $this->fetch_start_end_total_array($prevpage, $perpage, $results);
$show['prev'] = true;
}
if ($pagenumber < $totalpages)
{
$nextpage = $pagenumber + 1;
$nextnumbers = $this->fetch_start_end_total_array($nextpage, $perpage, $results);
$show['next'] = true;
}
// create array of possible relative links that we might have (eg. +10, +20, +50, etc.)
$pagenavsarr = array(10, 50, 100, 500, 1000);
$pagenavpages = 5;
while ($curpage++ < $totalpages)
{
if (abs($curpage - $pagenumber) >= $pagenavpages AND $pagenavpages != 0)
{
if ($curpage == 1)
{
$firstnumbers = $this->fetch_start_end_total_array(1, $perpage, $results);
$show['first'] = true;
}
if ($curpage == $totalpages)
{
$lastnumbers = $this->fetch_start_end_total_array($totalpages, $perpage, $results);
$show['last'] = true;
}
// generate relative links (eg. +10,etc).
if (in_array(abs($curpage - $pagenumber), $pagenavsarr) AND $curpage != 1 AND $curpage != $totalpages)
{
$pagenumbers = $this->fetch_start_end_total_array($curpage, $perpage, $results);
$relpage = $curpage - $pagenumber;
if ($relpage > 0)
{
$relpage = '+' . $relpage;
}
$pagenav .= "<a onclick=\"$option[onclick]\" class=\"smallfont\" href=\"$address". "/page:$curpage". ($address2 ? '?'.$address2 : '') . "\" title=\"显示结果从 $pagenumbers[first] 到 $pagenumbers[last] 共计 $total 条\"><!--$relpage--> $curpage </a>";
}
}
else
{
if ($curpage == $pagenumber)
{
$numbers = $this->fetch_start_end_total_array($curpage, $perpage, $results);
$pagenav .= " <span class=\"smallfont\" title=\"显示结果从 $numbers[first] 到 $numbers[last] 共计 $total 条\"><strong> $curpage </strong></span>";
}
else
{
$pagenumbers = $this->fetch_start_end_total_array($curpage, $perpage, $results);
$pagenav .= "<a onclick=\"$option[onclick]\" class=\"smallfont\" href=\"$address". "/page:$curpage". (($address2) ? '?'.$address2 : '') . "\" title=\"显示结果从 $pagenumbers[first] 到 $pagenumbers[last] 共计 $total 条\"> $curpage </a>";
}
}
}
$pagenav = "
<span class=\"disabled\">
".(($show['prev']) ? ("<a onclick=\"$option[onclick]\" class=\"smallfont\" href=\"$address".("/page:$prevpage".($address2 ? '?'.$address2 : ''))."\" title=\"上一页 - 结果从 $prevnumbers[first] 到 $prevnumbers[last] 共计 $total\">上一页</a></span>") : ("上一页</span>"))."
$pagenav
".(($show['next']) ? ("<span><a onclick=\"$option[onclick]\" class=\"smallfont\" href=\"$address/page:$nextpage".($address2 ? '?'.$address2 : '')."\" title=\"下一页 - 结果从 $nextnumbers[first] 到 $nextnumbers[last] 共计 $total\">下一页</a></span>") : ("<span>下一页</span>"))."
<span>第 $pagenumber / $totalpages 页,共 <strong>$total</strong>条记录</span>";
return $pagenav;
}
/**
* Returns an array so you can print 'Showing results $arr[first] to $arr[last] of $totalresults'
*
* @param integer Current page number
* @param integer Results to show per-page
* @param integer Total results found
*
* @return array In the format of - array('first' => x, 'last' => y)
*/
function fetch_start_end_total_array($pagenumber, $perpage, $total)
{
$first = $perpage * ($pagenumber - 1);
$last = $first + $perpage;
if ($last > $total)
{
$last = $total;
}
$first++;
return array('first' => number_format($first), 'last' => number_format($last));
}
}
?> |
