Django内置的分页模块
自定义分页
未封装版：
- 优点：直观
- 缺点：代码乱，不易维护，可拓展性差
data = []
for i in range(1, 302):
tmp = {"id": i, "name": "alex-{}".format(i)}
data.append(tmp)
print(data)
def user_list(request):
# user_list = data[0:10]
# user_list = data[10:20]
try:
current_page = int(request.GET.get("page"))
except Exception as e:
current_page = 1
per_page = 10
# 数据总条数
total_count = len(data)
# 总页码
total_page, more = divmod(total_count, per_page)
if more:
total_page += 1
# 页面最多显示多少个页码
max_show = 11
half_show = int((max_show-1)/2)
if current_page <= half_show:
show_start = 1
show_end = max_show
else:
if current_page + half_show >= total_page:
show_start = total_page - max_show
show_end = total_page
else:
show_start = current_page - half_show
show_end = current_page + half_show
# 数据库中获取数据
data_start = (current_page - 1) * per_page
data_end = current_page * per_page
user_list = data[data_start:data_end]
# 生成页面上显示的页码
page_html_list = []
# 加首页
first_li = '<li><a href="/user_list/?page=1">首页</a></li>'
page_html_list.append(first_li)
# 加上一页
if current_page == 1:
prev_li = '<li><a href="#">上一页</a></li>'
else:
prev_li = '<li><a href="/user_list/?page={}">上一页</a></li>'.format(current_page - 1)
page_html_list.append(prev_li)
for i in range(show_start, show_end+1):
if i == current_page:
li_tag = '<li class="active"><a href="/user_list/?page={0}">{0}</a></li>'.format(i)
else:
li_tag = '<li><a href="/user_list/?page={0}">{0}</a></li>'.format(i)
page_html_list.append(li_tag)
# 加下一页
if current_page == total_page:
next_li = '<li><a href="#">下一页</a></li>'
else:
next_li = '<li><a href="/user_list/?page={}">下一页</a></li>'.format(current_page+1)
page_html_list.append(next_li)
# 加尾页
page_end_li = '<li><a href="/user_list/?page={}">尾页</a></li>'.format(total_page)
page_html_list.append(page_end_li)
page_html = "".join(page_html_list)
return render(request, "user_list.html", {"user_list": user_list, "page_html": page_html})
封装版：
- 优点：易维护、可拓展性强
- 缺点：逻辑相对复杂
"""
自定义分页组件
"""
class Pagination(object):
def __init__(self, data_num, current_page, url_prefix, per_page=10, max_show=11):
"""
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
if self.page_num < self.page_end:
self.page_end = self.page_num # 如果总页面小于结束页面，那么结束页面即为总页码
@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))
for i in range(self.page_start, self.page_end + 1):
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}?page={1}">{1}</a></li>'.format(self.url_prefix, 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)
封装版使用步骤：
- 将上面的一段代码复制到自定义的模块（pt文件）中
- 导入自定义模块
- 在views系统的函数里写入以下代码
def user_list(request): # 实例化一个分页类的对象 obj = Pagination(blogs.count(),page,'blogs.html') # 根据传入的总博客数、页码获取当页需要展示的博客 blog_list = blogs[obj.start:obj.end] # 根据传入的博客数及页码获取生成分页的html格式的页码列表 page_html = pager.page_html() #返回指定页面 return render(request, "blog_list.html", {"blog_list": blog_list, "page_html": page_html}) - 在需要生成页面的html页面写入以下代码
<div class="topicListFooter fenye"> <ul class="pagination"> {{ page_html|safe }} </ul> </div>注：示例中用的是bootstrap分页样式
Django中的内置分页（不能展示页码列表）
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})
内置分页view部分
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<ul>
{% for item in posts %}
<li>{{ item }}</li>
{% endfor %}
</ul>
<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>
</body>
</html>
内置分页HTML部分
