11 Djongo组件——分页器

Django的分页器（paginator）

view

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})

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>分页器</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 }}">上一页</a></li>
                 {% else %}
                    <li class="previous disabled"><a href="#">上一页</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 }}">下一页</a></li>
                 {% else %}
                    <li class="next disabled"><a href="#">下一页</a></li>
                 {% endif %}
            </ul>
</div>
</body>
</html>

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>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())