Django 自定义分页器的实现代码

为什么要实现分页？

在大部分网站中分页的功能都是必要的，尤其是在后台管理中分页更是不可或缺

分页能带给用户更好的体验，也能减轻服务器的压力

对于分页来说，有许多方法都可以实现

例如把数据全部读取出来在前端用javascript实现，但这样一次请求全部数据服务器压力很大，

还有就是在后端实现，每一次请求部分数据显示

分页需求：

1. 每页显示的多少条数据

2. 页面显示多少个页码

3. 上一页和下一页

4. 首页和尾页

效果演示：

代码实现：

分页类封装:

在我的app下创建一个page.py文件，进行封装，我是先在我的app下创建了一个utils文件再创建page.py

class Pagination(object):

def __init__(self, current_page_num, all_count, request, per_page_num=10, pager_count=11):
   """
   封装分页相关数据
   :param current_page_num: 当前访问页的数字
   :param all_count:  分页数据中的数据总条数
   :param per_page_num: 每页显示的数据条数
   :param pager_count: 最多显示的页码个数
   """
   try:
     current_page_num = int(current_page_num)
   except Exception as e:
     current_page_num = 1

if current_page_num < 1:
     current_page_num = 1

self.current_page_num = current_page_num

self.all_count = all_count
   self.per_page_num = per_page_num

# 实际总页码
   all_pager, tmp = divmod(all_count, per_page_num)
   if tmp:
     all_pager += 1
   self.all_pager = all_pager

self.pager_count = pager_count
   self.pager_count_half = int((pager_count - 1) / 2) # 5

# 保存搜索条件
   import copy
   self.params = copy.deepcopy(request.GET) # {"a":"1","b":"2"}

# 开始
 @property
 def start(self):
   return (self.current_page_num - 1) * self.per_page_num

# 结束
 @property
 def end(self):
   return self.current_page_num * self.per_page_num

# 实现
 def page_html(self):
   # 如果总页码 < 11个：
   if self.all_pager <= self.pager_count:
     pager_start = 1
     pager_end = self.all_pager + 1
   # 总页码 > 11
   else:
     # 当前页如果<=页面上最多显示11/2个页码
     if self.current_page_num <= self.pager_count_half:
       pager_start = 1
       pager_end = self.pager_count + 1
     # 当前页大于5
     else:
       # 页码翻到最后
       if (self.current_page_num + self.pager_count_half) > self.all_pager:

pager_start = self.all_pager - self.pager_count + 1
         pager_end = self.all_pager + 1

else:
         pager_start = self.current_page_num - self.pager_count_half
         pager_end = self.current_page_num + self.pager_count_half + 1

page_html_list = []

first_page = '<li><a href="?page=％s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >首页</a></li>' ％ (1,)
   page_html_list.append(first_page)

if self.current_page_num <= 1:
     prev_page = '<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" >上一页</a></li>'
   else:
     prev_page = '<li><a href="?page=％s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a></li>' ％ (self.current_page_num - 1,)

page_html_list.append(prev_page)

# self.params=copy.deepcopy(request.GET) # {"a":"1","b":"2"}

for i in range(pager_start, pager_end):

self.params["page"] = i

if i == self.current_page_num:
       temp = '<li class="active"><a href="?％s" rel="external nofollow" rel="external nofollow" >％s</a></li>' ％ (self.params.urlencode(), i)
     else:
       temp = '<li><a href="?％s" rel="external nofollow" rel="external nofollow" >％s</a></li>' ％ (self.params.urlencode(), i,)
     page_html_list.append(temp)

if self.current_page_num >= self.all_pager:
     next_page = '<li class="disabled"><a href="#" rel="external nofollow" rel="external nofollow" >下一页</a></li>'
   else:
     next_page = '<li><a href="?page=％s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a></li>' ％ (self.current_page_num + 1,)
   page_html_list.append(next_page)
   last_page = '<li><a href="?page=％s" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>' ％ (self.all_pager,)
   page_html_list.append(last_page)

return ''.join(page_html_list)

在视图中使用

views.py

# 首先导入包
from myapp.utils.page import Pagination
from myapp.models import User

def index(request):
 # queryset
 user_list = User.objects.all()
 # 总页数
 page_count = user_list.count()
 # 当前页
 current_page_num = request.GET.get("page")
 pagination = Pagination(current_page_num, page_count, request, per_page_num=1)
 # 处理之后的数据
 user_list = user_list[pagination.start:pagination.end]

content = {
   "user_list": user_list,
   "pagination": pagination,
 }
 return render(request, "user_list.html", content)

页面显示

user_list.html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>index</title>
 <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="external nofollow" >
</head>
<body>
<div class="container">
 <table class="table table-striped">
   <thead>
   <tr>
     <th>name</th>
   </tr>
   </thead>
   <tbody>
   {％ for user in user_list ％}
     <tr>
       <td>{{ user.name }}</td>
     </tr>
   {％ endfor ％}
   </tbody>
 </table>
 <!-- bootstrap 样式 -->
 <div class="dataTables_paginate paging_simple_numbers pull-right">
   <ul class="pagination">
     {{ pagination.page_html|safe }}
   </ul>
 </div>
</div>
</body>
</html>

来源：https://www.cnblogs.com/pungchur/p/11913277.html