Python Django 页面上展示固定的页码数实现代码

2019-11-25 11:54:39

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如果页数太多的话，全部显示在页面上就会显得很冗杂

可以在页面中显示规定的页码数

例如：

book_list.html：

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>书籍列表</title>  <link rel="stylesheet" href="/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>        <a href="#" rel="external nofollow" rel="external nofollow" aria-label="Previous">          <span aria-hidden="true">«</span>        </a>      </li>      <li>        {{ page_html|safe }}      </li>      <li>        <a href="#" rel="external nofollow" rel="external nofollow" aria-label="Next">          <span aria-hidden="true">»</span>        </a>      </li>    </ul>  </nav> </div> </body></html>

views.py：

from django.shortcuts import renderfrom 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 = '<li><a href="/book_list/?page={0}" rel="external nofollow" >{0}</a></li>'.format(i)    html_list.append(tmp)   page_html = "".join(html_list)   return render(request, "book_list.html", {"books": all_book, "page_html": page_html})

运行结果：