介绍&代码

之前参考前辈实现的分页组件，还ok。

介绍：

　　基于Web，实现分页样式 和 控制页面内容数据的展示形式。

实现：

 from django.utils.safestring import mark_safe

 class Pagination(object):
     def __init__(self, current_page, all_count, base_url, query_params, per_page=20, pager_page_count=11):
         """
         分页初始化
         :param current_page: 当前页码
         :param per_page: 每页显示数据条数
         :param all_count: 数据库中总条数
         :param base_url: 基础URL
         :param query_params: QueryDict对象，内部含所有当前URL的原条件
         :param pager_page_count: 页面上最多显示的页码数量
         """
         self.base_url = base_url
         try:
             self.current_page = int(current_page)
             if self.current_page <= 0:
                 raise Exception()
         except Exception as e:
             self.current_page = 1
         self.query_params = query_params
         self.per_page = per_page
         self.all_count = all_count
         self.pager_page_count = pager_page_count
         pager_count, b = divmod(all_count, per_page)
         if b != 0:
             pager_count += 1
         self.pager_count = pager_count

         half_pager_page_count = int(pager_page_count / 2)
         self.half_pager_page_count = half_pager_page_count

     @property
     def start(self):
         """
         数据获取值起始索引
         :return:
         """
         return (self.current_page - 1) * self.per_page

     @property
     def end(self):
         """
         数据获取值结束索引
         :return:
         """
         return self.current_page * self.per_page

     def page_html(self):
         """
         生成HTML页码
         :return:
         """
         # 如果数据总页码pager_count<11 pager_page_count
         if self.pager_count < self.pager_page_count:
             pager_start = 1
             pager_end = self.pager_count
         else:
             # 数据页码已经超过11
             # 判断： 如果当前页 <= 5 half_pager_page_count
             if self.current_page <= self.half_pager_page_count:
                 pager_start = 1
                 pager_end = self.pager_page_count
             else:
                 # 如果： 当前页+5 > 总页码
                 if (self.current_page + self.half_pager_page_count) > self.pager_count:
                     pager_end = self.pager_count
                     pager_start = self.pager_count - self.pager_page_count + 1
                 else:
                     pager_start = self.current_page - self.half_pager_page_count
                     pager_end = self.current_page + self.half_pager_page_count

         page_list = []

         if self.current_page <= 1:
             prev = '<li><a href="#">上一页</a></li>'
         else:
             self.query_params['page'] = self.current_page - 1
             prev = '<li><a href="%s?%s">上一页</a></li>' % (self.base_url, self.query_params.urlencode())
         page_list.append(prev)
         for i in range(pager_start, pager_end + 1):
             self.query_params['page'] = i
             if self.current_page == i:
                 tpl = '<li class="active"><a href="%s?%s">%s</a></li>' % (
                     self.base_url, self.query_params.urlencode(), i,)
             else:
                 tpl = '<li><a href="%s?%s">%s</a></li>' % (self.base_url, self.query_params.urlencode(), i,)
             page_list.append(tpl)

         if self.current_page >= self.pager_count:
             nex = '<li><a href="#">下一页</a></li>'
         else:
             self.query_params['page'] = self.current_page + 1
             nex = '<li><a href="%s?%s">下一页</a></li>' % (self.base_url, self.query_params.urlencode(),)
         page_list.append(nex)
         page_str = "".join(page_list)
         return mark_safe(page_str)