封装好的自定义分页器
class Page():
def __init__(self, page_num, total_count, base_url, params, per_page=10, max_page=11):
"""
page_num: 当前页码数
total_count: 数据总数
base_url: a标签href的前缀
params: request对象，是QueryDict类型
per_page: 每页显示多少条数据
max_page: 单一页面上最多显示几个页码
"""
self.page_num = page_num
self.total_count = total_count
self.base_url = base_url
self.params = params
self.per_page = per_page
self.max_page = max_page
# 总页码
total_page, m = divmod(self.total_count, self.per_page)
if m:
total_page += 1
self.total_page = total_page
try:
self.page_num = int(self.page_num)
# print("self.page_num==>", self.page_num) 1
# 如果输入的页码数大于最大的页码数，默认返回第一页
if self.page_num > self.total_page:
self.page_num = self.total_page
elif self.page_num <= 0:
self.page_num = 1
except Exception as e:
# 当输入的页码不是数字时，返回第一页
self.page_num = 1
#如果当前页码数为0，那么数据开始位置也是0
if self.page_num == 0:
self.data_start = self.page_num
# 定义两个变量保存数据从哪取到哪
else:
self.data_start = (self.page_num - 1) * 10
self.data_end = self.page_num * 10
#页面上总共展示多少页码
#如果总页数小于设定的单页显示页码数
if self.total_page < self.max_page:
self.max_page = self.total_page
# 让选定页码取中，计算左右两边长度
self.half_max_page = self.max_page // 2
# 页面上展示的页码从哪开始
self.page_start = self.page_num - self.half_max_page
# 页面上展示的页码从哪结束
self.page_end = self.page_num + self.half_max_page
# 如果开始页数小于1
if self.page_start <= 1:
self.page_start = 1
self.page_end = self.max_page
# 如果结束页面大于最大页码数
elif self.page_end >= self.total_page:
self.page_start = self.total_page - self.max_page + 1
self.page_end = self.total_page
#拷贝一份request对象，是个QueryDict形式，后面会用于获取及修改url
import copy
self.params = copy.deepcopy(self.params) #{"page":"12","title_startwith":"py","id_gt":"5"}
@property
def start(self):
return self.data_start
@property
def end(self):
return self.data_end
def page_html(self):
# 自己拼接分页的HTML代码
html_str_list = []
print("html_str_list==>", html_str_list)
# 加上上一页标签
#判断一下如果是第一页就没有上一页了
if self.page_num <= 1:
html_str_list.append('<li class="disabled"><a rel="nofollow" href="#"><span aria-hidden="true">«</span></a></li>')
#否则加上上一页
else:
self.params["page"] = self.page_num - 1
html_str_list.append('<li><a rel="nofollow" href="{0}?{1}"><span aria-hidden="true">«</span></a></li>'.format(self.base_url ,self.params.urlencode()))
# 加上首页
self.params["page"] = 1
html_str_list.append('<li><a rel="nofollow" href="{0}?{1}">首页</a></li>'.format(self.base_url, self.params.urlencode()))
for i in range(self.page_start, self.page_end + 1):
#把QueryDict中的page修改为当前循环的页码
self.params["page"] = i
# 如果i等于当前页就加一个样式类
if i == self.page_num:
tmp = '<li class="active"><a rel="nofollow" href="{0}?page={1}">{2}</a></li>'.format(self.base_url, self.params.urlencode(), i)
else:
tmp = '<li><a rel="nofollow" href="{0}?{1}">{2}</a></li>'.format(self.base_url, self.params.urlencode(), i)
html_str_list.append(tmp)
# 加上尾页
self.params["page"] = self.total_page
html_str_list.append('<li><a rel="nofollow" href="{0}?{1}">尾页</a></li>'.format(self.base_url, self.params.urlencode()))
# 加上下一页标签
#判断，如果是最后一页，就没有下一页
if self.page_num >= self.total_page:
html_str_list.append('<li class="disabled"><a rel="nofollow" href="#"><span aria-hidden="true">»</span></a></li>')
else:
self.params["page"] = self.page_num + 1
html_str_list.append('<li><a rel="nofollow" href="{0}?{1}"><span aria-hidden="true">»</span></a></li>'.format(self.base_url, self.params.urlencode()))
page_html = "".join(html_str_list)
return page_html
