Django 实现的分页类

 1 from django.utils.safestring import mark_safe
 2 
 3 
 4 class Page:
 5     def __init__(self, current_page, data_count, per_page_count=10, pager_num=7):
 6         self.current_page = current_page
 7         self.data_count = data_count
 8         self.per_page_count = per_page_count
 9         self.pager_num = pager_num
10 
11     @property
12     def start(self):
13         return (self.current_page - 1) * self.per_page_count
14 
15     @property
16     def end(self):
17         return self.current_page * self.per_page_count
18 
19     @property
20     def total_count(self):
21         v, y = divmod(self.data_count, self.per_page_count)
22         if y:
23             v += 1
24         return v
25 
26     def page_str(self, base_url):
27         page_list = []
28 
29         if self.total_count < self.pager_num:
30             start_index = 1
31             end_index = self.total_count + 1
32         else:
33             if self.current_page <= (self.pager_num + 1) / 2:
34                 start_index = 1
35                 end_index = self.pager_num + 1
36             else:
37                 start_index = self.current_page - (self.pager_num - 1) / 2
38                 end_index = self.current_page + (self.pager_num + 1) / 2
39                 if (self.current_page + (self.pager_num - 1) / 2) > self.total_count:
40                     end_index = self.total_count + 1
41                     start_index = self.total_count - self.pager_num + 1
42 
43         if self.current_page == 1:
44             prev = ‘<a class="page" href="javascript:void(0);">上一页</a>‘
45         else:
46             prev = ‘<a class="page" href="%s?p=%s">上一页</a>‘ % (base_url, self.current_page - 1,)
47         page_list.append(prev)
48 
49         for i in range(int(start_index), int(end_index)):
50             if i == self.current_page:
51                 temp = ‘<a class="page active" href="%s?p=%s">%s</a>‘ % (base_url, i, i)
52             else:
53                 temp = ‘<a class="page" href="%s?p=%s">%s</a>‘ % (base_url, i, i)
54             page_list.append(temp)
55 
56         if self.current_page == self.total_count:
57             nex = ‘<a class="page" href="javascript:void(0);">下一页</a>‘
58         else:
59             nex = ‘<a class="page" href="%s?p=%s">下一页</a>‘ % (base_url, self.current_page + 1,)
60         page_list.append(nex)
61 
62         jump = """
63         <input type=‘text‘  /><a onclick=‘jumpTo(this, "%s?p=");‘>GO</a>
64         <script>
65             function jumpTo(ths,base){
66                 var val = ths.previousSibling.value;
67                 location.href = base + val;
68             }
69         </script>
70         """ % (base_url,)
71 
72         page_list.append(jump)
73 
74         page_str = mark_safe("".join(page_list))
75 
76         return page_str