Django 之 分页功能

HTML代码

    
    
    
    
    
    


图书列表


    {% for book in book_list %}
        
    {% endfor %}
    

    

    

        
ID
        
名字
        
出版社
        
价格
    
    
    

            
{{ book.id }}
            
{{ book.title }}
            

                {{ book.publisher.name }}
            
            
{{ book.price }}
        

{#重点位置#}

    

        

            
                首页
            
        
                {{ page_html|safe }}
        

            
                尾页
            
        
    

Python 代码

def book_list(request):
    # 每一页显示数量
    per_page = 7

    # 总数据
    total_count = models.Book.objects.all().count()

    # 总共需要多少页显示数据
    total_page, m = divmod(total_count, per_page)
    if m:
        total_page += 1

    # 从URL中取参数,当没有page时，page_num为1，当page_num大于总页数时，赋于最后一页，当page为字符时，异常出错时，为1值
    try:
        page_num = request.GET.get("page")
        page_num = int(page_num)
        if page_num > total_page:
            page_num = total_page
        elif page_num < 1:
            page_num =1
    except Exception as e:
        page_num = 1

    #定义两个变量，截取数据
    data_start = (page_num-1)*per_page
    data_end = page_num*per_page

    #页面上总共展示多少页面
    max_page =11
    if total_page < max_page:
        max_page = total_page

    half_max_page = max_page//2    #结果为5，即左右各5页

    # 页面上展示的面码从那儿结束
    page_end = page_num + half_max_page

    #页面上展示的页码从那儿开始
    page_start = page_num - half_max_page

    #如果当前面减一半比1还小
    if page_start <= 1:
        page_start = 1
        page_end = max_page

    #如果当前页大于总页数
    if page_end >= total_page:
        page_end = total_page
        page_start = total_page-max_page+1

    #在后台拼接分页的html
    html_str_list = []
    for i in range(page_start, page_end+1):
        #为当前加一个active样式
        if i == page_num:
            tmp = '
{0}
'.format(i)
        else:
            tmp = '
{0}
'.format(i)
        html_str_list.append(tmp)

    #将所有li的html文件拼接连接成一块
    page_html = "".join(html_str_list)
    #print(page_html)

    all_book = models.Book.objects.all()[data_start:data_end]
    return render(request,"book.html",{"book_list":all_book,"page_html":page_html,"total_page":total_page})

展示效果