分页器（自定制）

一、函数（自定）

 1 def show_books(request):
 2     url = request.path_info
 3     all_book_list = models.Book.objects.all()
 4     total_data = all_book_list
 5     total_data_num = total_data.count()             # 总数据条数
 6 
 7     current_pagetag_id = request.GET.get('page')    # 当前页码id
 8     try:
 9         current_pagetag_id = int(current_pagetag_id)
10     except Exception:
11         current_pagetag_id = 1
12 
13     perpage_data_num = 10                   # 每个页面展示数据条数
14 
15     quotient, remainder = divmod(total_data_num, perpage_data_num)
16     total_pagetag_num = quotient if remainder == 0 else quotient+1  # 总页码数
17 
18     # 控制当前页码乱入负数等等情况
19     if current_pagetag_id < 1:
20         current_pagetag_id = 1
21     elif current_pagetag_id > total_pagetag_num:
22         current_pagetag_id = total_pagetag_num
23 
24     pagedata_start_id = (current_pagetag_id - 1) * 10
25     pagedata_end_id = current_pagetag_id * 10
26 
27     display_pagetag_num = 9                                         # 页面中页码导航条显示的页码个数
28     left_pagetag_id = current_pagetag_id-display_pagetag_num//2     # 页码导航条最左边的页码id
29     right_pagetag_id = current_pagetag_id+display_pagetag_num//2    # 页码导航条最右边的页码id
30 
31     # 两端控制溢出
32     if left_pagetag_id < 1:
33         left_pagetag_id = 1
34         right_pagetag_id = display_pagetag_num
35     if right_pagetag_id > total_pagetag_num:
36         right_pagetag_id = total_pagetag_num
37         left_pagetag_id = total_pagetag_num-display_pagetag_num+1
38 
39     # 数据量不足的情况下，控制页码导航条的显示
40     if total_pagetag_num < display_pagetag_num:
41         left_pagetag_id = 1
42         right_pagetag_id = total_pagetag_num
43 
44     pagetag_html = ''
45     first_page_html = '<li><a href="{}?page=1">首页</a></li>'.format(url)
46     last_page_html = '<li><a href="{}?page={}">尾页</a></li>'.format(url, total_pagetag_num)
47     prev_page_html = '<li><a href="{}?page={}">上一页</a></li>'.format(url, current_pagetag_id-1)
48     next_page_html = '<li><a href="{}?page={}">下一页</a></li>'.format(url, current_pagetag_id+1)
49 
50     for i in range(left_pagetag_id, right_pagetag_id+1):
51         if i == current_pagetag_id:
52             pagetag_html += '<li class="active"><a href="{0}?page={1}">{1}</a></li>'.format(url, i)
53         else:
54             pagetag_html += '<li><a href="{0}?page={1}">{1}</a></li>'.format(url, i)
55 
56     pagetag_html = prev_page_html+first_page_html+pagetag_html+last_page_html+next_page_html
57 
58     all_book_list = total_data[pagedata_start_id:pagedata_end_id]
59 
60     return render(request, 'book_list.html', {'all_book_list': all_book_list, 'pagetag_html': pagetag_html})

分页器函数（未封装）