django分页
1.路由系统
url(r'^custom.html$', views.custom),
2.前端
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>分页</title>
<link rel="stylesheet" href="/static/plugin/bootstrap-3.3.7/css/bootstrap.css">
</head>
<body>
<h1>用户列表</h1>
<ul style="list-style: none;">
{% for row in user_list %}
<li>{{ row.name }}</li>
{% endfor %}
</ul>
<nav aria-label="Page navigation">
<ul class="pagination">
{{ obj.pager|safe}}
</ul>
</nav>
</body>
</html>
3.views函数
# 分页
from utils.pager import PageInfo
def custom(request):
# http://127.0.0.1:8000/custom.html?page=6
current_page = request.GET.get("page")
# 获取数据总行数
all_count = models.UserInfo.objects.all().count()
# 调用封装分页的类
obj = PageInfo(current_page,all_count,10,"/custom.html")
# 需要显示的页码
user_list = models.UserInfo.objects.all()[obj.start():obj.end()]
print(user_list)
return render(request, "custom.html", {"user_list":user_list,
"obj":obj})
4.封装分页类
class PageInfo():
"""
:param current_page: 当前页码
:param all_count: 数据库总行数
:param per_page: 每页显示行数
:param base_url: 基本路径
:param show_page: 每页显示页码数
"""
def __init__(self,current_page, all_count, per_page, base_url, show_page=11):
# 防止页面的非法输入
try:
self.current_page = int(current_page)
except Exception as e:
# 非法输入时跳到首页
self.current_page = 1
self.per_page= per_page
a, b = divmod(all_count, per_page)
if b:
a = a+1
self.all_pager = a # 数据总共有多少页
self.show_page = show_page # 每页显示的 页码 数
self.base_url = base_url
def start(self):
return (self.current_page - 1) * self.per_page
def end(self):
return self.current_page * self.per_page
def pager(self):
page_list = []
# 页码中间值
half = int((self.show_page -1 ) / 2)
# 如果数据总页数 < 11 页
if self.all_pager < self.show_page:
begin = 1
stop = self.all_pager + 1
# 如果数据总页数>11页
else:
# 如果当前页 <=5，永远显示1-11页
if self.current_page <= half:
begin = 1
stop = self.show_page + 1
else:
# 当前页+5，超出了总页数
if self.current_page + half > self.all_pager:
begin = self.all_pager - self.show_page + 1
stop = self.all_pager + 1
else:
# 正常显示页码
begin = self.current_page - half
stop = self.current_page + half + 1
# 上一页
if self.current_page <= 1:
prev = "<li><a href='#'>上一页</a1></li>"
else:
prev = "<li><a href='%s?page=%s'>上一页</a1></li>" %(self.base_url, self.current_page-1)
page_list.append(prev)
# 页码
for i in range(begin, stop):
if i == self.current_page:
page_list.append("<li class='active'><a href='%s?page=%s'>%s</a1></li>" %(self.base_url, i, i))
else:
page_list.append("<li><a href='%s?page=%s'>%s</a1></li>" %(self.base_url, i, i))
# 下一页
if self.current_page >= self.all_pager:
after = "<li><a href='#'>下一页</a></li>"
else:
after = "<li><a href='%s?page=%s'>下一页</a></li>" %(self.base_url, self.current_page+1)
page_list.append(after)
return "".join(page_list)