"""
custom pagination component
"""
class Pagination(object):
def __init__(self, data_num, current_page, url_prefix,params, per_page=10, max_show=3):
"""
to initialize.
:param data_num: total number of data
:param current_page: current page
:param url_prefix: The link prefix of the generated page number
:param per_page: how many pieces of data to display per page
:param max_show: The maximum number of page numbers displayed on the page
"""
self.data_num = data_num
self.per_page = per_page
self.max_show = max_show
self.url_prefix = url_prefix
#Calculate the number of pages
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
#If the number of pages passed from the URL is negative if self.current_page <= 0:
self.current_page = 1
#If the number of pages passed from the URL exceeds the maximum number of pages
elif self.current_page > self.page_num:
self.current_page = self.page_num #Show the last page by default
# Calculate half the number of pages
self.half_show = max_show // 2
#How much is displayed on the far left of the page number
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: #If the right side is out of bounds
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 #The
page number is displayed on the far right
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):
#Where does the data start to cut
return (self.current_page - 1) * self.per_page
@property
def end(self):
#Where to cut the data slice
return self.current_page * self.per_page
def page_html(self): #Generate
page number
l = []
#Add a home page
l.append( ' <li><a href="{}?page=1">Home</a></li> ' .format (self.url_prefix)) #Add
a previous page
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)
#Add a next page
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)
