始终显示以前的 &使用 CodeIgniter 分页类的下一个链接 [英] Always show Previous & Next links using CodeIgniter Pagination Class
本文介绍了始终显示以前的 &使用 CodeIgniter 分页类的下一个链接的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
问题描述
当我在第一页时，previous 链接没有显示，当我在最后一页时，next 链接也是如此.我设置了 $config['prev_link']='previous' 和 $config['next_link']='next'.
Problem Description
When I'm at the first page, the previous link is not showing up and so do the next link when I'm at the last page. I set $config['prev_link']='previous' and $config['next_link']='next'.
问题
如何始终使用 CodeIgniter 分页类、Previous 和 Next 链接作为 标记当它们不使用时?
Question
How to always present, using the CodeIgniter pagination class, the Previous and Next links as <p> tags when they are not in used?
更新
最后自己解决.请参阅下面的解决方案.在 v2.1.3 上工作
Update
End up Solving it myself. See solution below. Working on v2.1.3
推荐答案
解决办法如下:
通过创建一个新文件来扩展 Codeigniter 分页类:
MY_Pagination.php并将其放置在application/library文件夹中.
Extend Codeigniter pagination class by creating a new file:
MY_Pagination.phpand placing it in theapplication/libraryfolder.
将所有变量和类的前缀声明从 protected 更改为 public.
Change all variables and classes prefix declarations from protected to public.
在 MY_Pagination.php 中定义两个公共变量:$display_prev_link 和 $display_next_link 并将其设置为 FALSE.
Define two public variable in MY_Pagination.php: $display_prev_link and $display_next_link and set it to FALSE.
在create_links()函数中，添加到if ($this->prev_link !== FALSE && $this->cur_page !== 1) 语句 elseif 语句:
In the create_links() function, add to the end of the if ($this->prev_link !== FALSE && $this->cur_page !== 1) statement an elseif statement:
elseif ($this->display_prev_link && $this->cur_page === 1)
$output .= $this->prev_tag_open.'<span>'.$this->prev_link.'</span>'.$this->next_tag_close;
和另一个 elseif 语句到 if ($this->next_link !== FALSE && $this->cur_page < $num_pages) 语句:
and another elseif statement to the end of the if ($this->next_link !== FALSE && $this->cur_page < $num_pages) statement:
elseif ($this->display_next_link && $this->cur_page >= $num_pages)
$output .= $this->next_tag_open.'<span>'.$this->next_link.'</span>'.$this->next_tag_close;
现在，
通过定义 $config['display_prev_link'] 和 $config['display_prev_link'] 等于 TRUE 或 FALSE，您可以控制Previous 和Next 链接的呈现.
By defining $config['display_prev_link'] and $config['display_prev_link'] equal to TRUE or FALSE, you can control the presentation of the Previous and Next links.
这是完整的application/library/MY_Pagination.php文件:
<?php
// Extends the Pagination Class
// Add an option of presenting the PREVIOUS and NEXT links when they're not needed.
// by setting $display_prev_link - and - $display_next_link to true
// !!! EDITIONS => LINES 263 AND 316 !!!
defined('BASEPATH') OR exit('No direct script access allowed');
class MY_Pagination extends CI_Pagination {
public $display_prev_link = false;
public $display_next_link = false;
public $base_url = '';
public $prefix = '';
public $suffix = '';
public $total_rows = 0;
public $per_page = 10;
public $num_links = 2;
public $cur_page = 0;
public $use_page_numbers = FALSE;
public $first_link = '‹ First';
public $next_link = '>';
public $prev_link = '<';
public $last_link = 'Last ›';
public $uri_segment = 3;
public $full_tag_open = '';
public $full_tag_close = '';
public $first_tag_open = '';
public $first_tag_close = '';
public $last_tag_open = '';
public $last_tag_close = '';
public $first_url = '';
public $cur_tag_open = '<strong>';
public $cur_tag_close = '</strong>';
public $next_tag_open = '';
public $next_tag_close = '';
public $prev_tag_open = '';
public $prev_tag_close = '';
public $num_tag_open = '';
public $num_tag_close = '';
public $page_query_string = FALSE;
public $query_string_segment = 'per_page';
public $display_pages = TRUE;
public $_attributes = '';
public $_link_types = array();
public $reuse_query_string = FALSE;
public $data_page_attr = 'data-ci-pagination-page';
// --------------------------------------------------------------------
/**
* Constructor
*
* @param array $params Initialization parameters
* @return void
*/
public function __construct($params = array())
{
$this->initialize($params);
log_message('debug', 'Pagination Class Initialized');
}
// --------------------------------------------------------------------
/**
* Initialize Preferences
*
* @param array $params Initialization parameters
* @return void
*/
public function initialize($params = array())
{
$attributes = array();
if (isset($params['attributes']) && is_array($params['attributes']))
{
$attributes = $params['attributes'];
unset($params['attributes']);
}
// Deprecated legacy support for the anchor_class option
// Should be removed in CI 3.1+
if (isset($params['anchor_class']))
{
empty($params['anchor_class']) OR $attributes['class'] = $params['anchor_class'];
unset($params['anchor_class']);
}
$this->_parse_attributes($attributes);
if (count($params) > 0)
{
foreach ($params as $key => $val)
{
if (isset($this->$key))
{
$this->$key = $val;
}
}
}
}
// --------------------------------------------------------------------
/**
* Generate the pagination links
*
* @return string
*/
public function create_links()
{
// If our item count or per-page total is zero there is no need to continue.
if ($this->total_rows === 0 OR $this->per_page === 0)
{
return '';
}
// Calculate the total number of pages
$num_pages = (int) ceil($this->total_rows / $this->per_page);
// Is there only one page? Hm... nothing more to do here then.
if ($num_pages === 1)
{
//$uri_page_number = 1;
//return '';
}
// Set the base page index for starting page number
$base_page = ($this->use_page_numbers) ? 1 : 0;
// Determine the current page number.
$CI =& get_instance();
// See if we are using a prefix or suffix on links
if ($this->prefix !== '' OR $this->suffix !== '')
{
$this->cur_page = (int) str_replace(array($this->prefix, $this->suffix), '', $CI->uri->rsegment($this->uri_segment));
}
if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE)
{
if ($CI->input->get($this->query_string_segment) != $base_page)
{
$this->cur_page = (int) $CI->input->get($this->query_string_segment);
}
}
elseif ( ! $this->cur_page && $CI->uri->segment($this->uri_segment) !== $base_page)
{
$this->cur_page = (int) $CI->uri->rsegment($this->uri_segment);
}
// Set current page to 1 if it's not valid or if using page numbers instead of offset
if ( ! is_numeric($this->cur_page) OR ($this->use_page_numbers && $this->cur_page === 0))
{
$this->cur_page = $base_page;
}
$this->num_links = (int) $this->num_links;
if ($this->num_links < 1)
{
show_error('Your number of links must be a positive number.');
}
// Is the page number beyond the result range?
// If so we show the last page
if ($this->use_page_numbers)
{
if ($this->cur_page > $num_pages)
{
$this->cur_page = $num_pages;
}
}
elseif ($this->cur_page > $this->total_rows)
{
$this->cur_page = ($num_pages - 1) * $this->per_page;
}
$uri_page_number = $this->cur_page;
if ( ! $this->use_page_numbers)
{
$this->cur_page = (int) floor(($this->cur_page/$this->per_page) + 1);
}
// Calculate the start and end numbers. These determine
// which number to start and end the digit links with
$start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;
$end = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;
// Is pagination being used over GET or POST? If get, add a per_page query
// string. If post, add a trailing slash to the base URL if needed
if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE)
{
$segment = (strpos($this->base_url, '?')) ? '&' : '?';
$this->base_url = rtrim($this->base_url).$segment.$this->query_string_segment.'=';
}
else
{
$this->base_url = rtrim($this->base_url, '/') .'/';
}
// And here we go...
$output = '';
$query_string = '';
// Add anything in the query string back to the links
// Note: Nothing to do with query_string_segment or any other query string options
if ($this->reuse_query_string === TRUE)
{
$get = $CI->input->get();
// Unset the controll, method, old-school routing options
unset($get['c'], $get['m'], $get[$this->query_string_segment]);
if ( ! empty($get))
{
// Put everything else onto the end
$query_string = (strpos($this->base_url, '?') !== FALSE ? '&' : '?')
.http_build_query($get, '', '&');
// Add this after the suffix to put it into more links easily
$this->suffix .= $query_string;
}
}
// Render the "First" link
if ($this->first_link !== FALSE && $this->cur_page > ($this->num_links + 1))
{
$first_url = ($this->first_url === '') ? $this->base_url : $this->first_url;
// Take the general parameters, and squeeze this pagination-page attr in there for JS fw's
$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, 1);
$output .= $this->first_tag_open.'<a href="'.$first_url.'"'.$attributes.$this->_attr_rel('start').'>'
.$this->first_link.'</a>'.$this->first_tag_close;
}
// Render the "previous" link
if ($this->prev_link !== FALSE && $this->cur_page !== 1)
{
$i = ($this->use_page_numbers) ? $uri_page_number - 1 : $uri_page_number - $this->per_page;
// Take the general parameters, and squeeze this pagination-page attr in there for JS fw's
$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, (int) $i);
if ($i === $base_page && $this->first_url !== '')
{
$output .= $this->prev_tag_open.'<a href="'.$this->first_url.$query_string.'"'.$attributes.$this->_attr_rel('prev').'>'
.$this->prev_link.'</a>'.$this->prev_tag_close;
}
else
{
$append = ($i === $base_page) ? $query_string : $this->prefix.$i.$this->suffix;
$output .= $this->prev_tag_open.'<a href="'.$this->base_url.$append.'"'.$attributes.$this->_attr_rel('prev').'>'
.$this->prev_link.'</a>'.$this->prev_tag_close;
}
}
// !!!!!!!! START EDITION !!!!!!!!!!
elseif ($this->display_prev_link && $this->cur_page === 1) {
$output .= $this->prev_tag_open.'<span>'.$this->prev_link.'</span>'.$this->next_tag_close;
}
// !!!!!!!! END EDITION !!!!!!!!!!
// Render the pages
if ($this->display_pages !== FALSE)
{
// Write the digit links
for ($loop = $start -1; $loop <= $end; $loop++)
{
$i = ($this->use_page_numbers) ? $loop : ($loop * $this->per_page) - $this->per_page;
// Take the general parameters, and squeeze this pagination-page attr in there for JS fw's
$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, (int) $i);
if ($i >= $base_page)
{
if ($this->cur_page === $loop)
{
$output .= $this->cur_tag_open.$loop.$this->cur_tag_close; // Current page
}
else
{
$n = ($i === $base_page) ? '' : $i;
if ($n === '' && ! empty($this->first_url))
{
//$output .= $this->num_tag_open.'<a href="'.$this->first_url.$query_string.'"'.$attributes.$this->_attr_rel('start').'>'
// .$loop.'</a>'.$this->num_tag_close;
}
else
{
$append = ($n === '') ? $query_string : $this->prefix.$n.$this->suffix;
$output .= $this->num_tag_open.'<a href="'.$this->base_url.$append.'"'.$attributes.$this->_attr_rel('start').'>'
.$loop.'</a>'.$this->num_tag_close;
}
}
}
}
}
// Render the "next" link
if ($this->next_link !== FALSE && $this->cur_page < $num_pages)
{
$i = ($this->use_page_numbers) ? $this->cur_page + 1 : $this->cur_page * $this->per_page;
// Take the general parameters, and squeeze this pagination-page attr in there for JS fw's
$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, (int) $i);
$output .= $this->next_tag_open.'<a href="'.$this->base_url.$this->prefix.$i.$this->suffix.'"'.$attributes
.$this->_attr_rel('next').'>'.$this->next_link.'</a>'.$this->next_tag_close;
}
// !!!!!!!! START EDITION !!!!!!!!!!
elseif ($this->display_next_link && $this->cur_page >= $num_pages) {
$output .= $this->next_tag_open.'<span>'.$this->next_link.'</span>'.$this->next_tag_close;
}
// !!!!!!!! END EDITION !!!!!!!!!!
// Render the "Last" link
if ($this->last_link !== FALSE && ($this->cur_page + $this->num_links) < $num_pages)
{
$i = ($this->use_page_numbers) ? $num_pages : ($num_pages * $this->per_page) - $this->per_page;
// Take the general parameters, and squeeze this pagination-page attr in there for JS fw's
$attributes = sprintf('%s %s="%d"', $this->_attributes, $this->data_page_attr, (int) $i);
$output .= $this->last_tag_open.'<a href="'.$this->base_url.$this->prefix.$i.$this->suffix.'"'.$attributes.'>'
.$this->last_link.'</a>'.$this->last_tag_close;
}
// Kill double slashes. Note: Sometimes we can end up with a double slash
// in the penultimate link so we'll kill all double slashes.
$output = preg_replace('#([^:])//+#', '\1/', $output);
// Add the wrapper HTML if exists
return $this->full_tag_open.$output.$this->full_tag_close;
}
// --------------------------------------------------------------------
/**
* Parse attributes
*
* @param array $attributes
* @return void
*/
public function _parse_attributes($attributes)
{
isset($attributes['rel']) OR $attributes['rel'] = TRUE;
$this->_link_types = ($attributes['rel'])
? array('start' => 'start', 'prev' => 'prev', 'next' => 'next')
: array();
unset($attributes['rel']);
$this->_attributes = '';
foreach ($attributes as $key => $value)
{
$this->_attributes .= ' '.$key.'="'.$value.'"';
}
}
// --------------------------------------------------------------------
/**
* Add "rel" attribute
*
* @link http://www.w3.org/TR/html5/links.html#linkTypes
* @param string $type
* @return string
*/
public function _attr_rel($type)
{
if (isset($this->_link_types[$type]))
{
unset($this->_link_types[$type]);
return ' rel="'.$type.'"';
}
return '';
}
}
/* End of file Pagination.php */
/* Location: ./system/libraries/Pagination.php */
并且不要忘记将 $config['$display_prev_link'] 和 $config['$display_next_link'] 设置为 true> 或 false 根据您的需要.
And don't forget to set $config['$display_prev_link'] and $config['$display_next_link'] set to true or false according to your needs.
祝你好运！
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