"""
自定义分页组件
"""
class Pagination(object):
def __init__(self, data_num, current_page, url_prefix,params, per_page=10, max_show=3):
"""
进行初始化.
:param data_num: 数据总数
:param current_page: 当前页
:param url_prefix: 生成的页码的链接前缀
:param per_page: 每页显示多少条数据
:param max_show: 页面最多显示多少个页码
"""
self.data_num = data_num
self.per_page = per_page
self.max_show = max_show
self.url_prefix = url_prefix
# 把页码数算出来
self.page_num, more = divmod(data_num, per_page)
if more:
self.page_num += 1
try:
self.current_page = int(current_page)
except Exception as e:
self.current_page = 1
# 如果URL传过来的页码数是负数
if self.current_page <= 0:
self.current_page = 1
# 如果URL传过来的页码数超过了最大页码数
elif self.current_page > self.page_num:
self.current_page = self.page_num # 默认展示最后一页
# 页码数的一半 算出来
self.half_show = max_show // 2
# 页码最左边显示多少
if self.current_page - self.half_show <= 1:
self.page_start = 1
self.page_end = self.max_show
elif self.current_page + self.half_show >= self.page_num: # 如果右边越界
self.page_end = self.page_num
self.page_start = self.page_num - self.max_show
else:
self.page_start = self.current_page - self.half_show
# 页码最右边显示
self.page_end = self.current_page + self.half_show
import copy
self.params=copy.deepcopy(params) # {"page":"12","title_startwith":"py","id__gt":"5"}
@property
def start(self):
# 数据从哪儿开始切
return (self.current_page - 1) * self.per_page
@property
def end(self):
# 数据切片切到哪儿
return self.current_page * self.per_page
def page_html(self):
# 生成页码
l = []
# 加一个首页
l.append('<li><a href="{}?page=1">首页</a></li>'.format(self.url_prefix))
# 加一个上一页
if self.current_page == 1:
l.append('<li class="disabled" ><a href="#">«</a></li>'.format(self.current_page))
else:
l.append('<li><a href="{}?page={}">«</a></li>'.format(self.url_prefix, self.current_page - 1))
# {"page":"12","title_startwith":"py","id__gt":"5"} # "page=12&title_startwith=py&id__gt=5"
print(self.params.urlencode())
for i in range(self.page_start, self.page_end + 1):
self.params["page"]=i # # {"page":"7","title_startwith":"py","id__gt":"5"} # "page=7&title_startwith=py&id__gt=5"
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}?{1}">{2}</a></li>'.format(self.url_prefix, self.params.urlencode(),i)
l.append(tmp)
# 加一个下一页
if self.current_page == self.page_num:
l.append('<li class="disabled"><a href="#">»</a></li>'.format(self.current_page))
else:
l.append('<li><a href="{}?page={}">»</a></li>'.format(self.url_prefix, self.current_page + 1))
# 加一个尾页
l.append('<li><a href="{}?page={}">尾页</a></li>'.format(self.url_prefix, self.page_num))
return "".join(l)
