分页器组件支持保存搜索条件

代码：
  1 class Pagination(object):
  2     def __init__(self, current_page, all_count, params,per_page_num=10, pager_count=11):
  3         """
  4         封装分页相关数据
  5         :param current_page: 当前页
  6         :param all_count:    数据库中的数据总条数
  7         :param per_page_num: 每页显示的数据条数
  8         :param pager_count:  最多显示的页码个数
  9 
 10         用法:
 11         queryset = model.objects.all()
 12         page_obj = Pagination(current_page,all_count)
 13         page_data = queryset[page_obj.start:page_obj.end]
 14         获取数据用page_data而不再使用原始的queryset
 15         获取前端分页样式用page_obj.page_html
 16 
 17         示例代码：
 18         current_page = self.request.GET.get("page", 1)
 19         self.page_obj = Pagination(current_page=current_page,all_count=self.queryset.count(),params=self.request.GET)
 20         self.page_queryset = self.queryset[self.page_obj.start:self.page_obj.end]
 21         前台：{{ show_obj.page_obj.page_html|safe }}
 22         """
 23         try:
 24             current_page = int(current_page)
 25         except Exception as e:
 26             current_page = 1
 27 
 28         if current_page < 1:
 29             current_page = 1
 30 
 31         self.current_page = current_page
 32 
 33         self.all_count = all_count
 34         self.per_page_num = per_page_num
 35 
 36         # 总页码
 37         all_pager, tmp = divmod(all_count, per_page_num)
 38         if tmp:
 39             all_pager += 1
 40         self.all_pager = all_pager
 41 
 42         self.pager_count = pager_count
 43         self.pager_count_half = int((pager_count - 1) / 2)
 44 
 45         import copy
 46         self.params = copy.deepcopy(params)
 47 
 48     @property
 49     def start(self):
 50         return (self.current_page - 1) * self.per_page_num
 51 
 52     @property
 53     def end(self):
 54         return self.current_page * self.per_page_num
 55 
 56     def page_html(self):
 57         # 如果总页码 < 11个：
 58         if self.all_pager <= self.pager_count:
 59             pager_start = 1
 60             pager_end = self.all_pager + 1
 61         # 总页码  > 11
 62         else:
 63             # 当前页如果<=页面上最多显示11/2个页码
 64             if self.current_page <= self.pager_count_half:
 65                 pager_start = 1
 66                 pager_end = self.pager_count + 1
 67 
 68             # 当前页大于5
 69             else:
 70                 # 页码翻到最后
 71                 if (self.current_page + self.pager_count_half) > self.all_pager:
 72                     pager_end = self.all_pager + 1
 73                     pager_start = self.all_pager - self.pager_count + 1
 74                 else:
 75                     pager_start = self.current_page - self.pager_count_half
 76                     pager_end = self.current_page + self.pager_count_half + 1
 77 
 78         page_html_list = []
 79         # 添加前面的nav和ul标签
 80         page_html_list.append('''
 81                     <nav aria-label='Page navigation>'
 82                     <ul class='pagination'>
 83                 ''')
 84         first_page = '<li><a href="?page=%s">首页</a></li>' % (1)
 85         page_html_list.append(first_page)
 86 
 87         if self.current_page <= 1:
 88             prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
 89         else:
 90             prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page - 1,)
 91 
 92         page_html_list.append(prev_page)
 93 
 94         for i in range(pager_start, pager_end):
 95             self.params['page'] = i
 96             if i == self.current_page:
 97                 temp = '<li class="active"><a href="?%s">%s</a></li>' % (self.params.urlencode(), i,)
 98             else:
 99                 temp = '<li><a href="?%s">%s</a></li>' % (self.params.urlencode(), i,)
100             page_html_list.append(temp)
101 
102         if self.current_page >= self.all_pager:
103             next_page = '<li class="disabled"><a href="#">下一页</a></li>'
104         else:
105             next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page + 1,)
106         page_html_list.append(next_page)
107 
108         last_page = '<li><a href="?page=%s">尾页</a></li>' % (self.all_pager,)
109         page_html_list.append(last_page)
110         # 尾部添加标签
111         page_html_list.append('''
112                                            </nav>
113                                            </ul>
114                                        ''')
115         return ''.join(page_html_list)
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