Always show Previous & Next links using CodeIgnite

2019-01-23 08:49发布

站内文章 / PHP
43 0 0

问题:

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'.

Question
How to always present, using the CodeIgniter pagination class, the Previous and Next links as <p> tags when they are not in used?

Update
End up Solving it myself. See solution below. Working on v2.1.3

回答1:

Here is the Solution:

  1. Extend Codeigniter pagination class by creating a new file: MY_Pagination.php and placing it in the application/library folder.

  2. Change all variables and classes prefix declarations from protected to public.

  3. Define two public variable in MY_Pagination.php: $display_prev_link and $display_next_link and set it to FALSE.

  4. 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;

    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;

So Now,

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.

Here is the complete application/library/MY_Pagination.php file:

<?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      = '&lsaquo; First';
    public $next_link       = '&gt;';
    public $prev_link       = '&lt;';
    public $last_link       = 'Last &rsaquo;';
    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, '?')) ? '&amp;' : '?';
            $this->base_url = rtrim($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 ? '&amp;' : '?')
                        .http_build_query($get, '', '&amp;');

                // 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 */

And don't forget to set $config['$display_prev_link'] and $config['$display_next_link'] set to true or false according to your needs.

Good Luck!



回答2:

Example: http://www.friv100flash.com/

$config['base_url'] = base_url(); // xác định trang phân trang
$config['total_rows'] = $this->Game_model->count_all(); // xác định tổng số record
$config['per_page'] = 120; // xác định số record ở mỗi trang
$config['uri_segment'] = 1; // xác định segment chứa page number
$config['num_links'] = 7;

$config['display_pages'] = TRUE;
$config['use_page_numbers'] = TRUE;

//Encapsulate whole pagination 
$config['full_tag_open'] = '<ul class="pagination">';
$config['full_tag_close'] = '</ul>';

//First link of pagination
$config['first_link'] = 'First';
$config['first_tag_open'] = '<li>>';
$config['first_tag_close'] = '</li>';

//Customizing the “Digit” Link
$config['num_tag_open'] = '<li>';
$config['num_tag_close'] = '</li>';

//For PREVIOUS PAGE Setup
$config['prev_link'] = 'prev';
$config['prev_tag_open'] = '<li>';
$config['prev_tag_close'] = '</li>';

//For NEXT PAGE Setup
$config['next_link'] = 'Next';
$config['next_tag_open'] = '<li>';
$config['next_tag_close'] = '</li>';

//For LAST PAGE Setup
$config['last_link'] = 'Last';
$config['last_tag_open'] = '<li>';
$config['last_tag_close'] = '</li>';

//For CURRENT page on which you are
$config['cur_tag_open'] = '<li class="active"><a href="#">';
$config['cur_tag_close'] = '</a></li>';
$this->pagination->initialize($config);

if($this->uri->segment(1) == 0)
{
    $offset = 0;
}
else
{
    $offset = ($config['per_page'])*($this->uri->segment(1)-1);
}


回答3:

ci\system\libraries\Pagination.php

before

    if  ($this->prev_link !== FALSE AND $this->cur_page != 1)
    {
        if ($this->use_page_numbers)
        {
            $i = $uri_page_number - 1;
        }
        else
        {
            $i = $uri_page_number - $this->per_page;
        }


        if ($i == 0 && $this->first_url != '')
        {
            $output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->first_url.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
        }
        else
        {
            $i = ($i == 0) ? '' : $this->prefix.$i.$this->suffix;
            $output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$i.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
        }

    }

after (ADD LAST 3 LINE)

    if  ($this->prev_link !== FALSE AND $this->cur_page != 1)
    {
        if ($this->use_page_numbers)
        {
            $i = $uri_page_number - 1;
        }
        else
        {
            $i = $uri_page_number - $this->per_page;
        }


        if ($i == 0 && $this->first_url != '')
        {
            $output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->first_url.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
        }
        else
        {
            $i = ($i == 0) ? '' : $this->prefix.$i.$this->suffix;
            $output .= $this->prev_tag_open.'<a '.$this->anchor_class.'href="'.$this->base_url.$i.'">'.$this->prev_link.'</a>'.$this->prev_tag_close;
        }

    }
    else{
         $output .= '<span class="hidden">'.$this->prev_link.'</span>';
    }


回答4:

Codeigniter Pagination Library pagination.php

class CI_Pagination { 

public $limit;

public $active_page;

public $query;

public $url;

function run_query(){
  $CI= &get_instance();
  $query= $CI->db->query($this->query)->result_array();
  return $query;  
}

function result(){
  $CI= &get_instance();
  $limit_start=($this->active_page - 1) * $this->limit;
  $limit_end=$this->limit;
  $query=$this->query.' order by id desc limit '.$limit_start.','.$limit_end;
  $query= $CI->db->query($query)->result_array();
  return $query; 
}

function size(){
  return sizeof($this->run_query());
}


function page_number(){
    ?>
    <ul class="pagination  no-margin">
        <li class="prev <?php if($this->active_page <= '1'){echo 'disabled';}else{echo '';} ?>">
            <a href="<?= $this->url ?>page=<?= $this->active_page-1 ?>">
                <i class="ace-icon fa fa-angle-double-left"></i>
            </a>
        </li>

        <?php 

            if($this->active_page >=10){$i=$this->active_page-8;}else{$i=2;} 

            $end_point=ceil($this->size()/$this->limit);
        ?>

        <li class="<?php if($this->active_page==$i){echo 'active';} ?>">
            <a href="<?= $this->url ?>page=1">1</a>
        </li>

        <li class="<?php if($this->active_page<=10){echo 'hide';} ?>">
            <a href="<?= $this->url ?>page=<?= $this->active_page-1 ?>">...</a>
        </li>

        <?php $n=1; for($i;$i<=$end_point-1;$i++){ if($n++ >=10){break;}?>

            <li class="<?php if($this->active_page==$i){echo 'active';} ?>">
                <a href="<?= $this->url ?>page=<?= $i ?>"><?= $i ?></a>
            </li>

        <?php } ?>

        <li class="<?php if($this->active_page>=($end_point-5)){echo 'hide';} ?>">
                <a href="<?= $this->url ?>page=<?= $this->active_page+1 ?>">...</a>
        </li>

        <li class="<?php if($this->active_page==$i){echo 'active';} ?>">
                <a href="<?= $this->url ?>page=<?= $end_point .'">'. $end_point ?></a>
        </li>

        <li class="next <?php if($this->active_page >=ceil($this->size()/$this->limit)){echo'disabled';}?>">
            <a href="<?= $this->url ?>page=<?= $this->active_page+1 ?>">
                <i class="ace-icon fa fa-angle-double-right"></i>
            </a>
        </li>
    </ul>
<?php
}

}

In Codeigniter controller

$this->load->library('pagination');
        $this->pagination->active_page = $page;
        $this->pagination->url = base_url('admins/popup?');
        $this->pagination->limit='50';
        $this->pagination->query='select * from contact where admin_id like "%'.$data["client_id"][0]["client_id"].'%"';
        $this->pagination->run_query();
        $data['pagination_data'] = $this->pagination->result();

IN Codeigniter View :

foreach ($pagination_data as $fet) { }
$this->pagination->page_number();

Jquery :

$(document).ready(function(){
            if($('#example >tbody >tr').length <=0){
              var row= document.getElementById("example").insertRow(-1);
              var cell1 = row.insertCell(0).colSpan=12;
              var cell1 = row.insertCell(0);
              cell1.innerHTML = "Result Not Found !";
            }
        });


标签： php codeigniter pagination codeigniter-2
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