分页器（paginator）
分页器的使用
>>> from django.core.paginator import Paginator
>>> objects = ['john', 'paul', 'george', 'ringo']
>>> p = Paginator(objects, 2)
>>> p.count #数据总数
4
>>> p.num_pages #总页数
2
>>> type(p.page_range) # `<type 'rangeiterator'>` in Python 2.
<class 'range_iterator'>
>>> p.page_range #页码的列表
range(1, 3) # =========[1,2]
>>> page1 = p.page(1) #第1页的page对象
>>> page1
<Page 1 of 2>
>>> page1.object_list #第1页的数据
['john', 'paul']
>>> page2 = p.page(2)
>>> page2.object_list #第2页的数据
['george', 'ringo']
>>> page2.has_next() #是否有下一页
False
>>> page2.has_previous() #是否有上一页
True
>>> page2.has_other_pages() #是否有其他页
True
>>> page2.next_page_number() #下一页的页码
Traceback (most recent call last):
...
EmptyPage: That page contains no results
>>> page2.previous_page_number() #上一页的页码
1
>>> page2.start_index() # 本页第一条记录的序数（从1开始）
3
>>> page2.end_index() # 本页最后录一条记录的序数（从1开始）
4
>>> p.page(0) #错误的页，抛出异常
Traceback (most recent call last):
...
EmptyPage: That page number is less than 1
>>> p.page(3) #错误的页，抛出异常
Traceback (most recent call last):
...
EmptyPage: That page contains no results
实现一个分页效果：
Template:
{% load staticfiles %}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="{% static 'bootstrap.css' %}">
</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="/blog/?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="/blog/?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="/blog/?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_list.has_next %}
<li class="next"><a href="/blog/?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>
views：
from django.shortcuts import render,HttpResponse
# Create your views here.
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from app01.models import *
def index(request):
'''
批量导入数据:
Booklist=[]
for i in range(100):
Booklist.append(Book(title="book"+str(i),price=30+i*i))
Book.objects.bulk_create(Booklist)
'''
book_list=Book.objects.all()
paginator = Paginator(book_list, 10)
page = request.GET.get('page',1)
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",locals())