"""
自定义分页组件的使用方法:
pager_obj = Pagination(request.GET.get('page',1),len(HOST_LIST),request.path_info)
host_list = HOST_LIST[pager_obj.start:pager_obj.end]
html = pager_obj.page_html()
return render(request,'hosts.html',{'host_list':host_list,"page_html":html})
"""
class Pagination(object):
"""
自定义分页
"""
per_page_count = 2
max_pager_count = 11
def __init__(self,current_page,total_count,base_url,params):
#current_page:当前页。total_count:总条数。base_url: 对应的路径。params:保存搜索条件
# per_page_count:每页显示数据条数。max_pager_count:最大显示的页数
try:
current_page = int(current_page) #页码是数字,需要转换。前端传来的是字符串
except Exception as e:
current_page = 1
if current_page <=0:
current_page = 1
#当前的页数
self.current_page = current_page
# 数据总条数
self.total_count = total_count
# 每页显示10条数据
self.per_page_count = self.per_page_count
# 页面上应该显示的最大页码
max_page_num, div = divmod(total_count, self.per_page_count) #divmod,余运算,总条数除以每页显示的条数
if div: #如果有余数,
max_page_num += 1 #就给最大的页数加1
#最大页数
self.max_page_num = max_page_num
# 页面上默认显示11个页面(当前页在中间)
self.max_pager_count = self.max_pager_count
self.half_max_pager_count = int((self.max_pager_count - 1) / 2) #取到中间的页码
# URL前缀
self.base_url = base_url
#request.GET
import copy
# params = copy.deepcopy(params)
# params._mutable =True
#包含当前列表页面素有的搜索条件
# {source:[2,], status:[2], gender:[2],consultant:[1],page:[1]}
# self.params[page] = 8
# self.params.urlencode()
# source=2&status=2&gender=2&consultant=1&page=8
# href="/hosts/?source=2&status=2&gender=2&consultant=1&page=8"
# href="%s?%s" %(self.base_url,self.params.urlencode())
# self.params = params
@property
def start(self): #起始页
return (self.current_page - 1) * self.per_page_count
@property
def end(self): #末尾页
return self.current_page * self.per_page_count
# 分页器
def page_html(self):
# 如果总页数 <= 11
if self.max_page_num <= self.max_pager_count:
pager_start = 1 #起始页为1
pager_end = self.max_page_num #末尾页为最大页数
# 如果总页数 > 11
else:
# 如果当前页 <= 5
if self.current_page <= self.half_max_pager_count:
pager_start = 1 #起始页为1
pager_end = self.max_pager_count #末尾页为最大显示的页数11
else:
# 当前页 + 5 > 总页码
if (self.current_page + self.half_max_pager_count) > self.max_page_num:
pager_end = self.max_page_num #末尾页为:最大页数
pager_start = self.max_page_num - self.max_pager_count + 1 #起始页为最大页减最大页码数+1
else:
pager_start = self.current_page - self.half_max_pager_count #起始页为当前页减自身一半
pager_end = self.current_page + self.half_max_pager_count #末尾页为当前页加自身一半
page_html_list = []
# 首页
# self.params['page'] = 1
first_page = '<li><a href="%s?%s">首页</a></li>'%(self.base_url,1,)
page_html_list.append(first_page)
#上一页
high_page = '<li><a href="%s?page=%s">上一页</a></li>'%(self.base_url,self.current_page-1)
if self.current_page == 1:
high_page = '<li class="hidden"><a href="%s?page=%s">上一页</a></li>' % (self.base_url, self.current_page - 1)
page_html_list.append(high_page)
else:
high_page = '<li><a href="%s?page=%s">上一页</a></li>' % (self.base_url, self.current_page - 1)
page_html_list.append(high_page)
#中间页
for i in range(pager_start, pager_end + 1):
if i == self.current_page:
temp = '<li class="active"><a href="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
else:
temp = '<li><a href="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
page_html_list.append(temp)
#下一页
# fall_page = '<li><a href="%s?page=%s">下一页</a></li>'%(self.base_url,self.current_page+1)
if self.current_page == self.max_page_num:
fall_page = '<li class="hidden"><a href="%s?page=%s">下一页</a></li>' % (self.base_url, self.current_page + 1)
page_html_list.append(fall_page)
else:
fall_page = '<li><a href="%s?page=%s">下一页</a></li>' % (self.base_url, self.current_page + 1)
page_html_list.append(fall_page)
#尾页
# self.params['page'] = self.max_page_num
last_page = '<li><a href="%s?page=%s">尾页</a></li>'%(self.base_url,self.max_page_num)
page_html_list.append(last_page)
return ''.join(page_html_list)