11 Djongo组件——分页器

柔光的暖阳◎ 2021-12-22 09:19 199阅读 0赞

# 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())

转载于:https://www.cnblogs.com/bai-max/p/9244491.html