分頁和中間件
阿新 • • 發佈：2017-11-02
creat tcs col ret lis paginator 分享 try con 
一、分頁
Django的分頁器（paginator）
view.py
from django.shortcuts import render,HttpResponse # Create your views here. from app01.models import * from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger def 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})
view.py
def chakanbook(request): ‘‘‘ 批量導入 Booklist = [] for i in range(100): Booklist.append(models.Book(title="book" + str(i), price=20 + i * i)) models.Book.objects.bulk_create(Booklist) :param request: :return: ‘‘‘ book_list = models.Book.objects.all()# book_list打印的是一個對象 先查看所有的書 paginator=Paginator(book_list,5) #這裏的book_list必須是一個集合對象，把所有的書分頁，一頁有五個 print(paginator.page_range) #range(1, 4) page_range = paginator.page_range num = request.GET.get("page",2)#得到頁數範圍,默認有1頁 print(num,type(num)) book_list = paginator.page(num) #顯示第一頁的內容 return render(request,"chakan.html",{"book_list":book_list,"page_range":page_range,"num":int(num)})
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>
擴展
def index(request): book_list=Book.objects.all() paginator = Paginator(book_list, 15) page = request.GET.get(‘page‘,1) currentPage=int(page) # 如果頁數十分多時，換另外一種顯示方式 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())
二、中間件
http://www.cnblogs.com/yuanchenqi/articles/7652353.html#_label0
分頁和中間件