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    Django实现基于类的分页功能

    栏目:Linux/apache问题 时间:2019-11-08 10:45

    开发个人博客时往往避免不了分页功能的实现,实现方法大体上分为函数和类两种。本文基于类实现分页功能,以下是详细代码:

    class Page:
     page_num = 0
     total_count = 0
     tartype = ""
     total_page = 0 # 总页数
     per_page = 8 # 每页显示8篇文章
     max_page = 11 # 每页最大展示页数选项
     half_page = max_page // 2
     category = "" # 标记该链接所属分类ID,首页默认为空
    
     def __init__(self, page_num, total_count, tartype, category):
     """
     初始化函数:接收页码数、总数据数,计算总页码数并过滤错误页码数据
     :param page_num: 页码数
     :param total_count: 总数据数
     :param tartype: 分类值
     :param category: 所属分类ID
     """
     self.page_num = page_num
     self.total_count = total_count
     self.tartype = tartype
     self.total_page, m = divmod(self.total_count, self.per_page) # 总页码数,余数为m
     if category:
      self.category = category
     if m:
      self.total_page += 1
     if self.total_page < self.max_page:
      self.max_page = self.total_page
      self.half_page = self.max_page // 2
     # 过滤错误get数据
     if self.page_num > self.total_page:
      self.page_num = self.total_page
     elif self.page_num < 1:
      self.page_num = 1
    
     def data_start(self):
     return (self.page_num - 1) * self.per_page
    
     def data_end(self):
     return self.page_num * self.per_page
    
     def page_html(self):
     # 计算页数选项
     page_start = self.page_num - self.half_page
     page_end = self.page_num + self.half_page
     if page_start <= 1:
      page_start = 1
      page_end = self.max_page
     if page_end >= self.total_page:
      page_end = self.total_page
      page_start = self.total_page - self.max_page + 1
     # 计算上一页下一页选项
     if self.page_num == 1:
      last_page = self.page_num
      next_page = self.page_num + 1
     else:
      if self.page_num == self.total_page:
      last_page = self.page_num - 1
      next_page = self.page_num
      else:
      last_page = self.page_num - 1
      next_page = self.page_num + 1
     print(self.category)
     html_str_list = []
     html_str_list.append('<li><a href="/{}/?page={}{}" >«</a></li>'.format(self.tartype, last_page, self.category))
     for i in range(page_start, page_end + 1):
      if i == self.page_num:
      tmp = '<li><a class="active" href="/{}/?page={}{}" >{}</a></li>'.format(self.tartype, i, self.category, i)
      html_str_list.append(tmp)
      continue
      tmp = '<li><a href="/{}/?page={}{}" >{}</a></li>'.format(self.tartype, i, self.category, i)
      html_str_list.append(tmp)
     html_str_list.append('<li><a href="/{}/?page={}{}" >»</a></li>'.format(self.tartype, next_page, self.category))
     page_html = "".join(html_str_list)
     return page_html

    通过修改per_page、max_page控制每页展示的文章数和分页模块展示的最大页码数。

    实现思路:创建page类对象,传入参数为page_num(当前页码数)、total_count(总文章数)、tartype(分类值)、category(所属分类ID)【注:tartpe用于区分index页还是category页,category为查询的分类ID,index页时值为空。可以根据自己要实现的功能进行修改】构造函数会计算出总页码数并过滤掉错误数据。需要实现某功能是直接调用类方法即可。

    类方法: