Django的分页器（paginator

分页和中间件

一、分页

Django的分页器（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})

 

 view.py

 

def chakanbook(request):
    '''
        批量导入
        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打印的是一个对象  先查看所有的书
    paginator=Paginator(book_list,5)  #这里的book_list必须是一个集合对象，把所有的书分页，一页有五个
    print(paginator.page_range)  #range(1, 4)
    num = request.GET.get("page",2)#得到页数范围,默认有1页
    print(num,type(num))
    book_list = paginator.page(num) #显示第一页的内容
    return render(request,"chakan.html",{"book_list":book_list,"page_range":page_range,"num":int(num),"paginator":paginator})

 

index.html:

 

    
    
    





    
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 %}

            

 

扩展

def index(request):


    book_list=Book.objects.all()

    paginator = Paginator(book_list, 15)
    page = request.GET.get('page',1)
    currentPage=int(page)

    #  如果页数十分多时，换另外一种显示方式
    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())