Django自定义分页与bootstrap分页结合

django中有自带的分页模块Paginator,想Paginator提供对象的列表，就可以提供每一页上对象的方法。

这里的话不讲解Paginator,而是自定义一个分页类来完成需求：

class Pagination(object):
  """用于Model字段值的选择""" 

  def __init__(self):
    pass 

  @classmethod
  def create_pagination(self, from_name='', model_name='',
             cur_page=1, start_page_omit_symbol = '...',
             end_page_omit_symbol = '...', one_page_data_size=10,
             show_page_item_len=9):
    """通过给的model和分页参数对相关model进行分页
    Args:
      from_name: 导入模块的 from后面的参数
        from {from_name} import model_name
      mode_name: 需要导入的模块名
        from from_name import {model_name}
      cur_page: 当前显示的是第几页
      start_page_omit_symbol: 超出的页数使用怎么样的省略号(前)
        ... 2 3 4
      end_page_omit_symbol: 超出的页数使用怎么样的省略号(后)
        1 2 3 4 ...
      one_page_data_size: 每一页显示几行
      show_page_item_len: 显示几个能点击的页数
    Return:
      pagination: dict
          pagination = {
            'objs': objs, # 需要显示model数据
            'all_obj_counts': all_obj_counts, # 一共多少行数据
            'start_pos': start_pos, # 数据分页开始的数据
            'end_pos': end_pos, # 数据分页结束的数据
            'all_page': all_page, # 一共有多少页
            'cur_page': cur_page, # 当前的页码
            'pre_page': pre_page, # 上一页的页码
            'next_page': next_page, # 下一页的页码
            'page_items': page_items, 能点击的页数
            'start_page_omit_symbol': start_page_omit_symbol, # 开始的省略号
            'end_page_omit_symbol': end_page_omit_symbol, # 结束的省略号
          }
    Raise: None
    """
    # 如果没有输入导入模块需要的相关信息直接退出
    if not from_name or not model_name:
      return None 

    import_str = 'from {from_name} import {model_name}'.format(
                     from_name = from_name,
                     model_name = model_name)
    # 导入模块
    exec import_str 

    start_pos = (cur_page - 1) * one_page_data_size
    end_pos = start_pos + one_page_data_size  

    # 查找需要的model数据
    find_objs_str = ('{model_name}.objects.all()'
             '[{start_pos}:{end_pos}]'.format(
                        model_name = model_name,
                        start_pos = start_pos,
                        end_pos = end_pos))
    objs = eval(find_objs_str)  

    # 计算总共的页数
    find_objs_count_str = '{model_name}.objects.count()'.format(
                        model_name = model_name)
    all_obj_counts = eval(find_objs_count_str)
    all_page = all_obj_counts / one_page_data_size
    remain_obj = all_obj_counts % one_page_data_size
    if remain_obj > 0:
      all_page += 1 

    # 限制当前页不能小于1和并且大于总页数
    cur_page = 1 if cur_page < 1 else cur_page
    cur_page = all_page if cur_page > all_page else cur_page 

    # 获得显示页数的最小页
    start_page = cur_page - show_page_item_len / 2
    if start_page > all_page - show_page_item_len:
      start_page = all_page - show_page_item_len + 1
    start_page = 1 if start_page < 1 else start_page 

    # 获得显示页数的最大页
    end_page = cur_page + show_page_item_len / 2
    end_page = all_page if end_page > all_page else end_page
    if end_page < show_page_item_len and all_page > show_page_item_len:
      end_page = show_page_item_len 

    # 获得上一页
    pre_page = cur_page - 1
    pre_page = 1 if pre_page < 1 else pre_page 

    # 获得下一页
    next_page = cur_page + 1
    next_page = all_page if next_page > all_page else next_page 

    # 处理省略符，是否显示
    if start_page <= 1:
      start_page_omit_symbol = '' 

    if end_page >= all_page:
      end_page_omit_symbol = '' 

    # 创建能点击的展示页码
    page_items = range(start_page, end_page + 1) 

    pagination = {
      'objs': objs,
      'all_obj_counts': all_obj_counts,
      'start_pos': start_pos,
      'end_pos': end_pos,
      'all_page': all_page,
      'cur_page': cur_page,
      'pre_page': pre_page,
      'next_page': next_page,
      'page_items': page_items,
      'start_page_omit_symbol': start_page_omit_symbol,
      'end_page_omit_symbol': end_page_omit_symbol,
    } 

    return pagination

利用bootstrap的css,生成好看的html如下：

<nav aria-label="Page navigation">
 <ul class="pagination">
  {% if pagination.cur_page != 1 %}
  <li><a href="?cur_page=1" rel="external nofollow" ><<</a></li>
  <li>
   <a href="?cur_page={{ pagination.pre_page }}" rel="external nofollow" aria-label="Previous">
    <span aria-hidden="true">«</span>
   </a>
  </li>
  {% endif %}
  {% for page_item in pagination.page_items %}
  {% if page_item == pagination.cur_page %}
    <li><a href="?cur_page={{ page_item }}" rel="external nofollow" rel="external nofollow" >{{ page_item }}</a></li>
  {% else %}
    <li><a href="?cur_page={{ page_item }}" rel="external nofollow" rel="external nofollow" >{{ page_item }}</a></li>
  {% endif %}
  {% endfor%}
  {% if pagination.cur_page != pagination.all_page %}
  <li>
   <a href="?cur_page={{ pagination.next_page }}" rel="external nofollow" aria-label="Next">
    <span aria-hidden="true">»</span>
   </a>
  </li>
  <li><a href="?cur_page={{ pagination.all_page }}" rel="external nofollow" >>></a></li>
  {% endif %}
 </ul>
</nav>

view函数如下：

def blogpage(request):
    #ojt = BlogPost.object.all()
    #p = Paginator(ojt,2)
    #page_count = p.count
    #page_data = p.page(page)
    #template = 'blogpage.html'
    #info = {'page_data':page_data,'page_count':page_count}
    #return render(request,template,{'page_data':page_data,'page_count':page_count})
    try:
        cur_page = int(request.GET.get('cur_page', '1'))
    except ValueError:
        cur_page = 1 

    pagination = Pagination.create_pagination(
             from_name='blog.models',
             model_name='BlogPost',
             cur_page=cur_page,
             start_page_omit_symbol = '...',
             end_page_omit_symbol = '...',
             one_page_data_size=1,
             show_page_item_len=5)
    return render(request, 'blogpage.html',{'pagination':pagination})

效果图如下：

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