本文目录
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,HttpResponse# Create your views here.from 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
Title 分页器
{% for book in book_list %}
- { { book.title }} -----{ { book.price }}
{% endfor %}{% if book_list.has_previous %}
- 上一页
{% else %}- 上一页
{% endif %} {% for num in paginator.page_range %} {% if num == currentPage %}- { { num }}
{% else %}- { { num }}
{% endif %} {% endfor %} {% if book_list.has_next %}- 下一页
{% else %}- 下一页
{% endif %}
4 扩展
''' 显示左5，右5，总共11个页， 1 如果总页码大于11 1.1 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_range page_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_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())
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=1 page = 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_range return render(request,'page_test.html',locals()) Title
- {% for foo in page %}
- { { foo.name }} {% endfor %}
---------https://www.cnblogs.com/liuqingzheng/articles/9509767.html