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Django之分頁初級版本

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):

    '''
    批量匯入資料:

    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) #資料總數 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物件 for i in page1: #遍歷第1頁的所有資料物件 print(i) print(page1.object_list) #第1頁的所有資料 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):
    '''
        批量匯入
        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列印的是一個物件  先檢視所有的書
    paginator=Paginator(book_list,5)  #這裡的book_list必須是一個集合物件,把所有的書分頁,一頁有五個
    print(paginator.page_range)  #range(1, 4)
    num = request.GET.get("page",2)#得到頁數範圍,預設有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),"paginator":paginator})

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>

擴充套件

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())