分页类代码：
class Page(object):
'''
自定义分页类
可以实现Django ORM数据的的分页展示
输出HTML代码：
使用说明：
from utils import mypage
page_obj = mypage.Page(total_num, current_page, 'publisher_list')
publisher_list = data[page_obj.data_start:page_obj.data_end]
page_html = page_obj.page_html()
为了显示效果，show_page_num最好使用奇数
'''
def __init__(self, total_num, current_page, url_prefix, per_page=10, show_page_num=9):
'''
:param total_num: 数据总条数
:param current_page: 当前访问的页码
:param url_prefix: 分页代码里a标签的前缀
:param per_page: 每一页显示多少数据
:param show_page_num: 页面上最多显示多少个页码
'''
self.total_num = total_num
self.url_prefix = url_prefix
self.per_page = per_page
self.show_page_num = show_page_num
# 根据传入的值计算当前页码左右放置多少个页码
self.half_show_page_num = self.show_page_num // 2
# 计算当前数据总共需要多少页码
total_page, more = divmod(self.total_num, self.per_page)
# 如果有余数就把页码加1
if more:
total_page += 1
self.total_page = total_page
# 数据有效性校验
try:
current_page = int(current_page)
except Exception as e:
current_page = 1
# 如果当前页码数大于总页码数，默认展示最后一页数据
if current_page > self.total_page:
current_page = self.total_page
# 如果当前页码小于1，默认展示第一页数据
if current_page < 1:
current_page = 1
self.current_page = current_page
# 计算页面上需要展示的页码范围
# 页码过小处理
if self.current_page - self.half_show_page_num <= 1:
page_start = 1
page_end = show_page_num
# 页码过大处理
elif self.current_page + self.half_show_page_num >= self.total_page:
page_end = self.total_page
page_start = self.total_page - self.show_page_num + 1
# 未超过正常范围
else:
page_start = self.current_page - self.half_show_page_num
page_end = self.current_page + self.half_show_page_num
# 计算得到的最终页码数
self.page_start = page_start
self.page_end = page_end
# 如果计算得到的页码数比总共需要展示页码数多，则把页码结束指定为总页码数
if self.page_end > self.total_page:
self.page_end = self.total_page
@property
def data_start(self):
'''
:return: 返回当前页面应该从哪里开始切数据
'''
return (self.current_page - 1) * self.per_page
@property
def data_end(self):
'''
:return: 返回当前页面从哪里结束数据
'''
return self.current_page * self.per_page
def page_html(self):
li_list = []
# 添加前面的nav和ul标签
li_list.append("""
<nav aria-label="Page navigation">
<ul class="pagination">
""")
# 添加首页
li_list.append('<li><a href="/{}/?page=1">首页</a></li>'.format(self.url_prefix))
# 添加上一页
if self.current_page <= 1: # 没有上一页
prev_html = '<li class="disabled"><a aria-label="Previous"><span aria-hidden="true">«</span></a></li>'
else:
prev_html = '<li><a href="/{}/?page={}" aria-label="Previous"><span aria-hidden="true">«</span></a></li>'.format(
self.url_prefix,
self.current_page - 1)
li_list.append(prev_html)
# 循环添加内部所有的页码
for i in range(self.page_start, self.page_end + 1):
if i == self.current_page:
tmp = '<li class="active"><a href="/{0}/?page={1}">{1}</a></li>'.format(self.url_prefix, i)
else:
tmp = '<li><a href="/{0}/?page={1}">{1}</a></li>'.format(self.url_prefix, i)
li_list.append(tmp)
# 添加下一页
if self.current_page >= self.total_page: # 表示没有下一页
next_html = '<li class="disabled"><a aria-label="Previous"><span aria-hidden="true">»</span></a></li>'
else:
next_html = '<li><a href="/{}/?page={}" aria-label="Previous"><span aria-hidden="true">»</span></a></li>'.format(
self.url_prefix, self.current_page + 1)
li_list.append(next_html)
# 添加尾页
li_list.append('<li><a href="/{}/?page={}">尾页</a></li>'.format(self.url_prefix, self.total_page))
# 添加结尾nav和ul标签
li_list.append("""
</ul>
</nav>
""")
# 将生成的标签拼接成一个大字符串
page_html = ''.join(li_list)
return page_html
导入文件后调用代码：
# 获取分页所需数据
total_num = data.count() # 获取数据总计条数
current_page = request.GET.get('page') # 获取当前页页码
url_prefix = request.path_info.strip('/') # 获取a标签所需参数
# 调用分页类
# 调用类传入参数生成实例
page_obj = mypage.Page(total_num, current_page, url_prefix, per_page=1)
# 按照分页所需数据对总数据进行分割获取当前页面所需展示的数据
data = data[page_obj.data_start:page_obj.data_end]
# 获取HTML代码
page_html = page_obj.page_html()