1 Django的分页器（paginator）简介
在页面显示分页数据，需要用到Django分页器组件
from django.core.paginator import Paginator
Paginator对象： paginator = Paginator(user_list, 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
page对象：page=paginator.page(1)
# 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
2 应用View层
from django.shortcuts import render,HttpResponsefrom app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnIntegerdef 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)''''''
分页器的使用:book_list=Book.objects.all()paginator = Paginator(book_list, 10)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#page=paginator.page(12) # error:EmptyPage#page=paginator.page("z") # error:PageNotAnInteger'''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",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
3 模版层 index.html
<!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>
4 扩展
'''显示左5，右5，总共11个页，1 如果总页码大于111.1 if 当前页码减5小于1，要生成1到12的列表（顾头不顾尾，共11个页码）page_range=range(1,12)1.2 elif 当前页码+5大于总页码，生成当前页码减10，到当前页码加1的列表（顾头不顾尾，共11个页码）page_range=range(paginator.num_pages-10,paginator.num_pages+1)1.3 else 生成当前页码-5，到当前页码+6的列表page_range=range(current_page_num-5,current_page_num+6)2 其它情况，生成的列表就是pageinator的page_rangepage_range=paginator.page_range'''
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>11: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_rangetry: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())
def page_test(request):# book_list=[]# for i in range(100):# book=Book(name='book%s'%i,price=10+i,pub_date='2018-09-18',publish_id=1)# book_list.append(book)# Book.objects.bulk_create(book_list,10)book_list=Book.objects.all()# 生成paginator对象，传入书籍列表，每页10条数据paginator=Paginator(book_list,3)# 总页码数print(paginator.num_pages)# 页码列表print(paginator.page_range)# 总数据print(paginator.count)# 获取页面传来的页码current_page=int(request.GET.get('page',1))page_range=[]# 左5 右5# 获取页面传来的页码的page对象try:page=paginator.page(current_page)# print(page.has_next()) #是否有下一页# print(page.next_page_number()) #下一页的页码# print(page.has_previous()) #是否有上一页# print(page.previous_page_number()) #上一页的页码# 循环打印出当页对象for i in page:print(i)except Exception as e:current_page=1page = paginator.page(1)if paginator.num_pages>11:if current_page+5>paginator.num_pages:page_range=range(paginator.num_pages-10,paginator.num_pages+1)elif current_page-5<1:page_range=range(1,12)else:page_range=range(current_page-5,current_page+6)else:page_range=paginator.page_rangereturn render(request,'page_test.html',locals())
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.min.css"><title>Title</title>
</head>
<body><ul>{% for foo in page %}<li>{{ foo.name }}</li>{% endfor %}</ul>
<nav aria-label="Page navigation"><ul class="pagination">{% if page.has_previous %}<li><a href="/page_test/?page={{ page.previous_page_number }}" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>{% else %}<li class="disabled"><a href="#" aria-label="Previous"><span aria-hidden="true">上一页</span></a></li>{% endif %}{% for foo in page_range %}{% if current_page == foo %}<li class="active"><a href="/page_test/?page={{ foo }}">{{ foo }}</a></li>{% else %}<li><a href="/page_test/?page={{ foo }}">{{ foo }}</a></li>{% endif %}{% endfor %}{% if page.has_next %}<li><a href="/page_test/?page={{ page.next_page_number }}" aria-label="Next"><span aria-hidden="true">下一页</span></a></li>{% else %}<li class="disabled"><a href="#" aria-label="Next"><span aria-hidden="true">下一页</span></a></li>{% endif %}</ul>
</nav></body>
</html>
