Python Django 封装分页成通用的模块详解

Python  /  管理员 发布于 7年前   215

这篇文章主要介绍了Python Django 封装分页成通用的模块详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

新建 utils 文件夹，并创建 page.py

page.py：

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      page_num = 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 * 10     # 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 // 2     # 页面上展示的页码的开始页    page_start = self.page_num - half_max_page    # 页面上展示的页码的结束页    page_end = self.page_num + half_max_page    # 如果当前页减一半比 1 还小    if page_start <= 1:      page_start = 1      page_end = self.max_page    # 如果当前页加一半比总页码还大    if page_end >= 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('<li><a href="https:/article/{}?page=1" rel="external nofollow" >首页</a></li>'.format( self.url_prefix))     # 如果是第一页，就没有上一页    if self.page_num <= 1:      html_list.append('<li class="disabled"><a href="" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.format(self.page_num - 1))    else:      # 加一个上一页的标签      html_list.append('<li><a href="https:/article/{}?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">«</span></a></li>'.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 = '<li class="active"><a href="https:/article/{0}?page={1}" rel="external nofollow" rel="external nofollow" >{1}</a></li>'.format(self.url_prefix, i)      else:        tmp = '<li><a href="https:/article/{0}?page={1}" rel="external nofollow" rel="external nofollow" >{1}</a></li>'.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('<li class="disabled"><a href="" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>')    else:      html_list.append(        '<li><a href="https:/article/{}?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span aria-hidden="true">»</span></a></li>'.format(self.url_prefix, self.page_num + 1))     # 添加尾页按钮    html_list.append('<li><a href="https:/article/{}?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>'.format(self.url_prefix, self.total_page))     page_html = "".join(html_list) # 拼接 html 的分页代码    return page_html

views.py：

from django.shortcuts import renderfrom 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})

book_list.html：

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>书籍列表</title>  <link rel="stylesheet" href="https:static/bootstrap/css/bootstrap.min.css" rel="external nofollow" ></head><body> <div class="container">   <table class="table table-bordered">    <thead>    <tr>      <th>序号</th>      <th>id</th>      <th>书名</th>    </tr>    </thead>    <tbody>    {% for book in books %}      <tr>        <td>{{ forloop.counter }}</td>        <td>{{ book.id }}</td>        <td>{{ book.title }}</td>      </tr>    {% endfor %}     </tbody>  </table>   <nav aria-label="Page navigation">    <ul class="pagination">      <li>        {{ page_html|safe }}      </li>    </ul>  </nav> </div></body></html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。