Django分页器

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

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})

3 模版层 index.html




    
    Title
    



分页器

    {% for book in book_list %}
  • {{ book.title }} -----{{ book.price }}
  • {% endfor %}

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 %}

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