PythonDjango页面上展示固定的页码数实现代码

  
  
  


 

 
  
    {% for book in books %}
      
    {% endfor %}
 
    

    

    

      
序号
      
id
      
书名
    
    
    

        
{{ forloop.counter }}
        
{{ book.id }}
        
{{ book.title }}
      
  
 
   
 

from django.shortcuts import render
from app01 import models 
def book_list(request):
  # 从 URL 中取参数
  page_num = request.GET.get("page")
  print(page_num, type(page_num))
  page_num = int(page_num)
 
  # 定义两个变量保存数据从哪儿取到哪儿
  data_start = (page_num-1)*10
  data_end = page_num*10
 
  # 书籍总数
  total_count = models.Book.objects.all().count()
 
  # 每一页显示多少条数据
  per_page = 10
 
  # 总共需要多少页码来显示
  total_page, m = divmod(total_count, per_page)
 
  # 页面上最多展示的页码
  max_page = 11
  half_max_page = max_page // 2
 
  # 页面上展示的页码的开始页
  page_start = page_num - half_max_page
  # 页面上展示的页码的结束页
  page_end = page_num + half_max_page
 
  # 如果当前页减一半比 1 小
  if page_start <= 1:
    page_start = 1
    page_end = max_page
  # 如果当前页加一半比总页码还大
  if page_end > total_page:
    page_end = total_page
    page_start = total_page - max_page + 1
 
  # 如果还有数据
  if m:
    total_page += 1
 
  all_book = models.Book.objects.all()[data_start:data_end]
 
  # 拼接 html 的分页代码
  html_list = []
  for i in range(page_start, page_end+1):
    tmp = '
{0}
'.format(i)
    html_list.append(tmp)
 
  page_html = "".join(html_list)
 
  return render(request, "book_list.html", {"books": all_book, "page_html": page_html})