Django--分页器（paginator）
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Django--分页器（paginator）
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1 Django的分頁器（paginator）簡介
在頁面顯示分頁數據，需要用到Django分頁器組件
from django.core.paginator import Paginator
Paginator對象： paginator = Paginator(user_list, 10) # per_page: 每頁顯示條目數量 # count: 數據總個數 # num_pages:總頁數 # page_range:總頁數的索引范圍，如: (1,10),(1,200) # page: page對象 page對象：page=paginator.page(1) # has_next 是否有下一頁 # next_page_number 下一頁頁碼 # has_previous 是否有上一頁 # previous_page_number 上一頁頁碼 # object_list 分頁之后的數據列表 # number 當前頁 # paginator paginator對象2 應用View層
from django.shortcuts import render,HttpResponse# Create your views here. from app01.models import * from django.core.paginator import Paginator, EmptyPage, PageNotAnIntegerdef index(request):'''批量導入數據:Booklist=[]for i in range(100):Booklist.append(Book(title="book"+str(i),price=30+i*i))Book.objects.bulk_create(Booklist)'''''' 分頁器的使用:book_list=Book.objects.all()paginator = Paginator(book_list, 10)print("count:",paginator.count) #數據總數print("num_pages",paginator.num_pages) #總頁數print("page_range",paginator.page_range) #頁碼的列表page1=paginator.page(1) #第1頁的page對象for i in page1: #遍歷第1頁的所有數據對象print(i)print(page1.object_list) #第1頁的所有數據page2=paginator.page(2)print(page2.has_next()) #是否有下一頁print(page2.next_page_number()) #下一頁的頁碼print(page2.has_previous()) #是否有上一頁print(page2.previous_page_number()) #上一頁的頁碼# 拋錯#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 模版層 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>分頁器</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 }}">上一頁</a></li>{% else %}<li class="previous disabled"><a href="#">上一頁</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 }}">下一頁</a></li>{% else %}<li class="next disabled"><a href="#">下一頁</a></li>{% endif %}</ul> </div></body> </html>4 擴展
'''顯示左5，右5，總共11個頁，1 如果總頁碼大于111.1 if 當前頁碼減5小于1，要生成1到12的列表（顧頭不顧尾，共11個頁碼）page_range=range(1,12)1.2 elif 當前頁碼+5大于總頁碼，生成當前頁碼減10，到當前頁碼加1的列表（顧頭不顧尾，共11個頁碼）page_range=range(paginator.num_pages-10,paginator.num_pages+1)1.3 else 生成當前頁碼-5，到當前頁碼+6的列表page_range=range(current_page_num-5,current_page_num+6)2 其它情況，生成的列表就是pageinator的page_rangepage_range=paginator.page_range'''?
?
HTML
<!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">上一頁</span></a></li>{% else %}<li class="disabled"><a href="#" aria-label="Previous"><span aria-hidden="true">上一頁</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">下一頁</span></a></li>{% else %}<li class="disabled"><a href="#" aria-label="Next"><span aria-hidden="true">下一頁</span></a></li>{% endif %}</ul> </nav></body> </html>模版?VIEWS
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對象，傳入書籍列表，每頁10條數據paginator=Paginator(book_list,3)# 總頁碼數print(paginator.num_pages)# 頁碼列表print(paginator.page_range)# 總數據print(paginator.count)# 獲取頁面傳來的頁碼current_page=int(request.GET.get('page',1))page_range=[]# 左5 右5# 獲取頁面傳來的頁碼的page對象try:page=paginator.page(current_page)# print(page.has_next()) #是否有下一頁# print(page.next_page_number()) #下一頁的頁碼# print(page.has_previous()) #是否有上一頁# print(page.previous_page_number()) #上一頁的頁碼# 循環打印出當頁對象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())views?
轉載于:https://www.cnblogs.com/polly-ling/p/9679327.html
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