Python Django 封装分页成通用的模块详解

 class ShowPage(object): def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11): ''' :param page_num: 当前页码数 :param total_count: 数据总数 :param url_prefix: a 标签 href 的前缀 :param per_page: 每页展示的数据数 :param max_page: 页面上最多显示的页码数 ''' self.url_prefix = url_prefix self.max_page = max_page # 总共需要多少页码来显示 total_page, m = divmod(total_count, per_page) # 如果还有数据 if m: total_page += 1 self.total_page = total_page try: page_num = int(page_num) # 如果输入的页码数超过了最大的页码数，默认返回最后一页 if page_num > self.total_page: page_num = self.total_page # 如果输入的页码数小于 1，则返回第一页 if page_num <1: page_num=1 except exception as e: # 当输入的页码不是正经数字的时候 默认返回第一页的数据 1 self.page_num=page_num 定义两个变量保存数据从哪儿取到哪儿 self.data_start=(self.page_num - 1) * 10 self.data_end=self.page_num 页面上总共展示多少页码 if self.total_page < self.max_page: self.max_page=self.total_page half_max_page=self.max_page>= self.total_page: page_end = self.total_page page_start = self.total_page - self.max_page + 1 self.page_start = page_start self.page_end = page_end @property def start(self): return self.data_start @property def end(self): return self.data_end def page_html(self): # 拼接 html 的分页代码 html_list = [] # 添加首页按钮 html_list.append('
首页
'.format( self.url_prefix)) # 如果是第一页，就没有上一页 if self.page_num <= 1: html_list.append('
«
'.format(self.page_num - 1)) else: # 加一个上一页的标签 html_list.append('
«
'.format(self.url_prefix, self.page_num-1)) # 展示的页码 for i in range(self.page_start, self.page_end + 1): # 给当前页添加 active if i == self.page_num: tmp = '
{1}
'.format(self.url_prefix, i) else: tmp = '
{1}
'.format(self.url_prefix, i) html_list.append(tmp) # 如果是最后一页，就没有下一页 if self.page_num >= self.total_page: html_list.append('
»
') else: html_list.append( '
»
'.format(self.url_prefix, self.page_num + 1)) # 添加尾页按钮 html_list.append('
尾页
'.format(self.url_prefix, self.total_page)) page_html = "".join(html_list) # 拼接 html 的分页代码 return page_html

 from django.shortcuts import render from app01 import models def book_list(request): # 从URL取参数 page_num = request.GET.get("page") print(page_num, type(page_num)) # 书籍总数 total_count = models.Book.objects.all().count() # 导入显示页码的函数 from utils.page import ShowPage page_obj = ShowPage(page_num, total_count, per_page=10, url_prefix="/book_list/", max_page=11, ) ret = models.Book.objects.all()[page_obj.start:page_obj.end] print(ret) page_html = page_obj.page_html() return render(request, "book_list.html", {"books": ret, "page_html": page_html})

    
  {% for book in books %}  {% endfor %} 
 
 
 
序号
id
书名
 
{{ forloop.counter }}
{{ book.id }}
{{ book.title }}