项目中，我们需要很多非业务逻辑的功能，例如分页功能，而且此类功能移植性很好，可以在不同的项目中使用，所以整理好这些功能会一定程度上提高开发效率，下面是分页功能代码，使用时，可单独放在utils目录
"""
使用方法：
from utils.page import Pagination
def users(request):
current_page = int(request.GET.get('page',1))
total_item_count = models.UserInfo.objects.all().count()
# page_obj = Pagination(current_page,total_item_count,request.path_info)
# request.path_info,当前请求的页面，也可以直接把请求页面写上，如下
page_obj = Pagination(current_page,total_item_count,'/users.html')
user_list = models.UserInfo.objects.all()[page_obj.start:page_obj.end]
return render(request,'users.html',{'user_list':user_list,'page_html':page_obj.page_html()})
"""
from django.utils.safestring import mark_safe
class Pagination(object):
def __init__(self,current_page,total_item_count,base_url,per_page_count=10,show_pager_count=11):
"""
:param current_page: 当前页
:param total_item_count: 数据库数据总条数
:param base_url: 分页前缀URL
:param per_page_count: 每页显示数据条数
:param show_pager_count: 对多显示的页码
"""
self.current_page = current_page
self.total_item_count = total_item_count
self.base_url = base_url
self.per_page_count = per_page_count
self.show_pager_count = show_pager_count
max_pager_num, b = divmod(total_item_count, per_page_count)
if b:
max_pager_num += 1
self.max_pager_num = max_pager_num
@property
def start(self):
"""
:return:
"""
return (self.current_page-1)* self.per_page_count
@property
def end(self):
"""
:return:
"""
return self.current_page * self.per_page_count
def page_html(self):
"""
:return:
"""
page_list = []
if self.current_page == 1:
prev = ' <li><a href="#">上一页</a></li>'
else:
prev = ' <li><a href="%s?page=%s">上一页</a></li>' % (self.base_url,self.current_page - 1,)
page_list.append(prev)
half_show_pager_count = int(self.show_pager_count / 2)
# 数据特别少，15条数据=2页
if self.max_pager_num < self.show_pager_count:
# 页码小于11
pager_start = 1
pager_end = self.max_pager_num + 1
else:
if self.current_page <= half_show_pager_count:
pager_start = 1
pager_end = self.show_pager_count + 1
else:
if self.current_page + half_show_pager_count > self.max_pager_num:
pager_start = self.max_pager_num - self.show_pager_count + 1
pager_end = self.max_pager_num + 1
else:
pager_start = self.current_page - half_show_pager_count
pager_end = self.current_page + half_show_pager_count + 1
for i in range(pager_start, pager_end):
if i == self.current_page:
tpl = ' <li class="active"><a href="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
else:
tpl = ' <li><a href="%s?page=%s">%s</a></li>' % (self.base_url,i, i,)
page_list.append(tpl)
if self.current_page == self.max_pager_num:
nex = ' <li><a href="#">下一页</a></li>'
else:
nex = ' <li><a href="%s?page=%s">下一页</a></li>' % (self.base_url,self.current_page + 1,)
page_list.append(nex)
return mark_safe(''.join(page_list)
应用：
创建300条数据
页面显示
用get请求发送页码（get请求，直接在url后面加上"?page=n"就好了）
调用上面的页码类，写好视图函数
前端页面很简单就能显示出来页码
思路：
显示所有——按页显示(每页的起始结束项)——显示页码——当前页样式——上页下页——显示十个页码（当前页前后各五个）——页码前后极限处理