分页
一、自定义的分页
"""
分页组件使用示例：
obj = Pagination(request.GET.get('page',1),len(USER_LIST),request.path_info)
page_user_list = USER_LIST[obj.start:obj.end]
page_html = obj.page_html()
return render(request,'index.html',{'users':page_user_list,'page_html':page_html})
"""
class Pagination(object):
def __init__(self,current_page,all_count,base_url,per_page_num=10,pager_count=11):
"""
封装分页相关数据
:param current_page: 当前页
:param all_count: 数据库中的数据总条数
:param per_page_num: 每页显示的数据条数
:param base_url: 分页中显示的URL前缀
:param pager_count: 最多显示的页码个数
"""
try:
current_page = int(current_page)
except Exception as e:
current_page = 1
if current_page <1:
current_page = 1
self.current_page = current_page
self.all_count = all_count
self.per_page_num = per_page_num
self.base_url = base_url
# 总页码
all_pager, tmp = divmod(all_count, per_page_num)
if tmp:
all_pager += 1
self.all_pager = all_pager
self.pager_count = pager_count
self.pager_count_half = int((pager_count - 1) / 2)
@property
def start(self):
return (self.current_page - 1) * self.per_page_num
@property
def end(self):
return self.current_page * self.per_page_num
def page_html(self):
# 如果总页码 < 11个：
if self.all_pager <= self.pager_count:
pager_start = 1
pager_end = self.all_pager + 1
# 总页码 > 11
else:
# 当前页如果<=页面上最多显示11/2个页码
if self.current_page <= self.pager_count_half:
pager_start = 1
pager_end = self.pager_count + 1
# 当前页大于5
else:
# 页码翻到最后
if (self.current_page + self.pager_count_half) > self.all_pager:
pager_end = self.all_pager + 1
pager_start = self.all_pager - self.pager_count + 1
else:
pager_start = self.current_page - self.pager_count_half
pager_end = self.current_page + self.pager_count_half + 1
page_html_list = []
first_page = '<li><a href="%s?page=%s">首页</a></li>' % (self.base_url,1,)
page_html_list.append(first_page)
if self.current_page <= 1:
prev_page = '<li><a href="#">上一页</a></li>'
else:
prev_page = '<li><a href="%s?page=%s">上一页</a></li>' % (self.base_url,self.current_page - 1,)
page_html_list.append(prev_page)
for i in range(pager_start, pager_end):
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)
if self.current_page >= self.all_pager:
next_page = '<li><a href="#">下一页</a></li>'
else:
next_page = '<li><a href="%s?page=%s">下一页</a></li>' % (self.base_url,self.current_page + 1,)
page_html_list.append(next_page)
last_page = '<li><a href="%s?page=%s">尾页</a></li>' % (self.base_url,self.all_pager,)
page_html_list.append(last_page)
return ''.join(page_html_list)
二、Django自带的分页
只有上一页下一页，没有页码，不推荐用
后端
from django.shortcuts import render
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
L = []
for i in range(999):
L.append(i)
def index(request):
current_page = request.GET.get('p')
paginator = Paginator(L, 10)
# per_page: 每页显示条目数量
# count: 数据总个数
# num_pages:总页数
# page_range:总页数的索引范围，如: (1,10),(1,200)
# page: page对象
try:
posts = paginator.page(current_page)
# has_next 是否有下一页
# next_page_number 下一页页码
# has_previous 是否有上一页
# previous_page_number 上一页页码
# object_list 分页之后的数据列表
# number 当前页
# paginator paginator对象
except PageNotAnInteger:
posts = paginator.page(1)
except EmptyPage:
posts = paginator.page(paginator.num_pages)
return render(request, 'index.html', {'posts': posts})
前端：
<div class="pagination">
<span class="step-links">
{% if posts.has_previous %}
<a href="?p={{ posts.previous_page_number }}">Previous</a>
{% endif %}
<span class="current">
Page {{ posts.number }} of {{ posts.paginator.num_pages }}.
</span>
{% if posts.has_next %}
<a href="?p={{ posts.next_page_number }}">Next</a>
{% endif %}
</span>
</div>
