codeigniter实现ajax分页

<?php
/**
 *417 add  主要是实现ajax分页
 **/
 class MY_Pagination extends CI_Pagination{
  public function __construct()
    {
        parent::__construct();
    }

  /**
   * Generate the pagination links
   *
   * @access    public
   * @return    string
   */
  function create_ajax_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
    $num_pages = ceil($this->total_rows / $this->per_page);

    // Is there only one page? Hm... nothing more to do here then.
    if ($num_pages == 1)
    {
      return ‘‘;
    }

    // Set the base page index for starting page number
    if ($this->use_page_numbers)
    {
      $base_page = 1;
    }
    else
    {
      $base_page = 0;
    }

    // Determine the current page number.
    $CI =& get_instance();

    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 = $CI->input->get($this->query_string_segment);

        // Prep the current page - no funny business!
        $this->cur_page = (int) $this->cur_page;
      }
    }
    else
    {
      if ($CI->uri->segment($this->uri_segment) != $base_page)
      {
        $this->cur_page = $CI->uri->segment($this->uri_segment);

        // Prep the current page - no funny business!
        $this->cur_page = (int) $this->cur_page;
      }
    }

    // Set current page to 1 if using page numbers instead of offset
    if ($this->use_page_numbers AND $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.‘);
    }

    if ( ! is_numeric($this->cur_page))
    {
      $this->cur_page = $base_page;
    }

    // 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 = $num_pages;
      }
    }
    else
    {
      if ($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)
    {
      $this->cur_page = floor(($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)
    {
      $this->base_url = rtrim($this->base_url).‘&‘.$this->query_string_segment.‘=‘;
    }
    else
    {
      $this->base_url = rtrim($this->base_url, ‘/‘) .‘/‘;
    }

    // And here we go...
    $output = ‘‘;

    // Render the "First" link
    if  ($this->first_link !== FALSE AND $this->cur_page > ($this->num_links + 1))
    {
      $first_url = ($this->first_url == ‘‘) ? $this->base_url : $this->first_url;
      $output .= $this->first_tag_open.‘<a ‘." onclick=‘ajax_page(0);return false;‘".$this->anchor_class.‘href="javascript:void(0)">‘.$this->first_link.‘</a>‘.$this->first_tag_close;
    }

    // Render the "previous" link
    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 .= $this->prev_tag_open.‘<a ‘." onclick=‘ajax_page(0);return false;‘".$this->anchor_class.‘href="javascript:void(0)">‘.$this->prev_link.‘</a>‘.$this->prev_tag_close;
      }
      else
      {
        $i = ($i == 0) ? ‘‘ : $this->prefix.$i.$this->suffix;
        $output .= $this->prev_tag_open.‘<a ‘." onclick=‘ajax_page({$i});return false;‘".$this->anchor_class.‘href="javascript:void(0)">‘.$this->prev_link.‘</a>‘.$this->prev_tag_close;
      }

    }

    // Render the pages
    if ($this->display_pages !== FALSE)
    {
      // Write the digit links
      for ($loop = $start -1; $loop <= $end; $loop++)
      {
        if ($this->use_page_numbers)
        {
          $i = $loop;
        }
        else
        {
          $i = ($loop * $this->per_page) - $this->per_page;
        }

        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 == ‘‘ && $this->first_url != ‘‘)
            {
              $output .= $this->num_tag_open.‘<a ‘." onclick=‘ajax_page(0);return false;‘".$this->anchor_class.‘href="javascript:void(0)">‘.$loop.‘</a>‘.$this->num_tag_close;
            }
            else
            {
              $n = ($n == ‘‘) ? ‘‘ : $this->prefix.$n.$this->suffix;

              $output .= $this->num_tag_open.‘<a ‘." onclick=‘ajax_page({$n});return false;‘".$this->anchor_class.‘href="javascript:void(0)">‘.$loop.‘</a>‘.$this->num_tag_close;
            }
          }
        }
      }
    }

    // Render the "next" link
    if ($this->next_link !== FALSE AND $this->cur_page < $num_pages)
    {
      if ($this->use_page_numbers)
      {
        $i = $this->cur_page + 1;
      }
      else
      {
        $i = ($this->cur_page * $this->per_page);
      }
      $ajax_p = $this->prefix.$i.$this->suffix;
      $output .= $this->next_tag_open.‘<a ‘." onclick=‘ajax_page({$ajax_p});return false;‘".$this->anchor_class.‘href="javascript:void(0)">‘.$this->next_link.‘</a>‘.$this->next_tag_close;
    }

    // Render the "Last" link
    if ($this->last_link !== FALSE AND ($this->cur_page + $this->num_links) < $num_pages)
    {
      if ($this->use_page_numbers)
      {
        $i = $num_pages;
      }
      else
      {
        $i = (($num_pages * $this->per_page) - $this->per_page);
      }
      $ajax_p = $this->prefix.$i.$this->suffix;
      $output .= $this->last_tag_open.‘<a ‘." onclick=‘ajax_page({$ajax_p});‘". $this->anchor_class.‘href="javascript:void(0)">‘.$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
    $output = $this->full_tag_open.$output.$this->full_tag_close;

    return $output;
  }
 }

然后我们会在controller中来调用这个方法，代码如下

public function show_tpl($page=1){
    //配置分页类
    $config[‘base_url‘] = ‘/wechat_msg_template/send_message‘;
    $config[‘per_page‘] = 10;
    $config[‘uri_segment‘] = 3;
    $data[‘page_total‘] = $config[‘total_rows‘] = $this->wechat_msg_template_model->msg_template_list(); //为页总数
    $config[‘cur_tag_open‘] = ‘<a class="current">‘;
    $config[‘cur_tag_close‘] = ‘</a>‘;
    $config[‘first_link‘] = ‘«‘;
    $config[‘last_link‘] = ‘»‘;
    //获取分页
    $this->pagination->initialize($config);
    $data[‘page‘] = $this->pagination->create_ajax_links();
    if(!empty($data[‘page‘])){

    }

    $data[‘power_language‘]= $this->config->item(‘power_language‘);
    $data[‘top_item‘] = ‘msg_template_manage‘;
    $data[‘item‘]     = ‘wechat_msg_template‘;

    $list_result = $this->wechat_msg_template_model->msg_template_list(10,intval($this->uri->segment(3))); //结果
    $data[‘result‘] = $list_result;
    $this->load->view(‘show_tpl‘,$data);
  }

最后我们通过ajax 来调用 show_tpl 加载数据，达到无刷分页

javascript 代码如下：

function ajax_page(page){
  if(page==‘‘ || page==null || page==undefined){
    page = ‘‘;
  }
  content = ‘‘;
  $.ajax({
    type:‘GET‘,
    url:"/wechat_msg_template/show_tpl/"+page,
    async:false,
    success:function(data){
      content = data;
    }
  });
  $(".tab1_class").html(‘‘);

  $(".tab1_class").html(content);
  return false;
}