Django内置分页
准备工作
import os
if __name__ == '__main__':
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "new_pagedemo.settings")
import django
django.setup()
from app01 import models
# 列表生成式, 批量生成数据
create_list = (models.Book(title="book_%s" % i, price=i * i) for i in range(501,601))
# bulk_create()创建大量数据时使用
models.Book.objects.bulk_create(create_list)
学习研究
from app01.models import Book
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
def index(request):
# 分页器的使用:
book_list = Book.objects.all() # 总数据
paginator = Paginator(book_list, 10) # 传入总数据和每一页显示多少数据
print("count:", paginator.count) # 数据总数
print("num_pages", paginator.num_pages) # 总页数
print("page_range", paginator.page_range) # 页码的列表
page1 = paginator.page(1) # 第1页的page对象
for i in page1: # 遍历第1页的所有数据对象
print(i)
print(page1.object_list) # 第1页的所有数据
page2 = paginator.page(2)
print(page2.has_next()) # 是否有下一页
print(page2.next_page_number()) # 下一页的页码
print(page2.has_previous()) # 是否有上一页
print(page2.previous_page_number()) # 上一页的页码
# 抛错，假如没有12页和不正经的输入
page=paginator.page(12) # error:EmptyPage
page=paginator.page("z") # error:PageNotAnInteger
return HttpResponse('ok')
使用
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
def index(request):
book_list = Book.objects.all() # 总数据
paginator = Paginator(book_list, 10) # 总数居和一页显示多少数据
page = request.GET.get('page', 1) # 获取当前页码
currentPage = int(page)
try:
print(page)
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request, "index.html", {"book_list": book_list, "paginator": paginator, "currentPage": currentPage})
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<div class="container">
<h4>分页器</h4>
<ul>
{% for book in book_list %}
<li>{{ book.title }} -----{{ book.price }}</li>
{% endfor %}
</ul>
<ul class="pagination" id="pager">
{% if book_list.has_previous %}
<li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一页</a></li>
{% else %}
<li class="previous disabled"><a href="#">上一页</a></li>
{% endif %}
{% for num in paginator.page_range %}
{% if num == currentPage %}
<li class="item active"><a href="/index/?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="/index/?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_list.has_next %}
<li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li>
{% else %}
<li class="next disabled"><a href="#">下一页</a></li>
{% endif %}
</ul>
</div>
</body>
</html>
index.html
def index(request):
book_list=Book.objects.all()
paginator = Paginator(book_list, 15)
page = request.GET.get('page',1)
currentPage=int(page)
# 如果页数十分多时，换另外一种显示方式
if paginator.num_pages>30:
if currentPage-5<1:
pageRange=range(1,11)
elif currentPage+5>paginator.num_pages:
pageRange=range(currentPage-5,paginator.num_pages+1)
else:
pageRange=range(currentPage-5,currentPage+5)
else:
pageRange=paginator.page_range
try:
print(page)
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request,"index.html",locals())
扩展