Python Web框架中实现原生分页功能详解

分页器核心代码逻辑

#!/usr/bin/env python
# -*- coding:utf-8 -*-
 
 
class Pagination:
 
 def __init__(self, p, all_count, pre=10, max_show=11):
 '''
 :param p: 当前页码
 :param all_count: 数据总条数
 :param pre: 每页数据量
 :param max_show: 最多页码数
 '''
 try:
 self.p = int(p) # 传进来的页码
 if self.p <= 0:
 self.p = 1
 except Exception as e:
 self.p = 1
 
 # 总量
 # all_count = all_count
 # pre = per # 每页数据条数
 total_num, more = divmod(all_count, pre)
 if more:
 total_num += 1 # total_num总数据页数
 
 # 显示页码数
 max_show = max_show
 if total_num <= max_show: # 总数据量很小
 page_start = 1
 page_end = total_num
 else:
 if self.p - max_show // 2 <= 0: # 防止左边出现0页
 page_start = 1
 page_end = max_show
 
 elif self.p + max_show // 2 >= total_num + 1: # 防止右边出现超出
 page_end = total_num
 page_start = page_end - max_show
 else:
 page_start = self.p - max_show // 2
 page_end = self.p + max_show // 2
 
 # 数据的起始结束
 self.start = (self.p - 1) * pre
 self.end = self.p * pre
 
 # 页码
 self.page_start = page_start
 self.page_end = page_end
 self.total_num = total_num
 
 @property
 def page_html(self):
 li_list = []
 for i in range(self.page_start, self.page_end + 1):
 if i == self.p:
 li_list.append('<li class="active"><a href="?p={}" >{}</a></li>'.format(i, i))
 else:
 li_list.append('<li><a href="?p={}" >{}</a></li>'.format(i, i))
 
 # 添加页首 页尾
 
 li_list.insert(0,
  '<li><a href="?p={}" aria-label="Previous"><span aria-hidden="true">«</span></a></li>'.format(
  self.p - 1))
 li_list.append(
 '<li><a href="?p={}" aria-label="Next"><span aria-hidden="true">»</span> </a></li>'.format(self.p + 1))
 
 if self.p == 1:
 li_list[0] = '<li class="disabled"><span aria-hidden="true">«</span></li>'
 elif self.p == self.total_num:
 li_list[-1] = '<li class="disabled"><span aria-hidden="true">»</span></li>'
 
 pagehtml = ''.join(li_list)
 return pagehtml