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How to implement custom paging in Django?

零下一度Original: 2017-06-29 15:31:531067browse

This article mainly introduces the Django custom paging effect in detail, which has certain reference value. Interested friends can refer to it

Paging functionIn each Websites are necessary. For paging, it is actually to calculate the starting position of the data that should be displayed on the page in the database table based on the user's input.

Determinepaging requirements:

1. Number of data items displayed on each page
2. Number of page number links displayed on each page
3. Previous Page and next page
4. Home page and last page

Rendering:

First, use the built-in paging function of django, Write pagination class:

from django.core.paginator import Paginator, Page  # 导入django分页模块


class PageInfo(object):
 def init(self, current_page, all_count, base_url, per_page=10, show_page=11):
  """

  :param current_page: 当前页
  :param all_count: 总页数
  :param base_url: 模板
  :param per_page: 每页显示数据条数
  :param show_page: 显示链接页个数
  """
  #若url错误，默认显示第一页（错误类型可能为：空页面编号，非整数型页面编号）
  try:
   self.current_page = int(current_page)
  except Exception as e:
   self.current_page = 1
  
  #根据数据库信息条数得出总页数   
  a, b = pmod(all_count, per_page)
  if b:
   a += 1
  self.all_page = a 
  
  self.base_url = base_url
  self.per_page = per_page
  self.show_page = show_page

 #当前页起始数据id
 def start_data(self):  
  return (self.current_page - 1) * self.per_page

 #当前页结束数据id
 def end_data(self):  
  return self.current_page * self.per_page
 
 #动态生成前端html
 def pager(self):
  page_list = []
  half = int((self.show_page - 1)/2)
  #如果：总页数 < show_page，默认显示页数范围为： 1~总页数
  if self.all_page < self.show_page:
   start_page = 1
   end_page = self.all_page + 1
  #如果：总页数 > show_page
  else:
   #如果：current_page - half <= 0，默认显示页数范围为：1~show_page
   if self.current_page <= half:
    start_page = 1
    end_page = self.show_page + 1
   else:
    #如果：current_page + half >总页数，默认显示页数范围为：总页数 - show_page ~ 总页数
    if self.current_page + half > self.all_page:
     end_page = self.all_page + 1
     start_page = end_page - self.show_page
    else:
     start_page = self.current_page - half
     end_page = self.current_page + half + 1

  #首页
  first_page = "<li><a href=&#39;%s?page=%s&#39;>首页</a></li>" %(self.base_url, 1)
  page_list.append(first_page)

  #上一页（若当前页等于第一页，则上一页无链接，否则链接为当前页减1）
  if self.current_page <= 1:
   prev_page = "<li><a href=&#39;#&#39;>上一页</a></li>"
  else:
   prev_page = "<li><a href=&#39;%s?page=%s&#39;>上一页</a></li>" %(self.base_url, self.current_page-1)
  page_list.append(prev_page)

  #动态生成中间页数链接
  for i in range(start_page, end_page):
   if i == self.current_page:
    temp = "<li class=&#39;active&#39;><a href=&#39;%s?page=%s&#39;>%s</a></li>" %(self.base_url, i, i)
   else:
    temp = "<li><a href=&#39;%s?page=%s&#39;>%s</a></li>" % (self.base_url, i, i)
   page_list.append(temp)

  #下一页（若当前页等于最后页，则下一页无链接，否则链接为当前页加1）
  if self.current_page >= self.all_page:
   next_page = "<li><a href=&#39;#&#39;>下一页</a></li>"
  else:
   next_page = "<li><a href=&#39;%s?page=%s&#39;>下一页</a></li>" %(self.base_url, self.current_page+1)
  page_list.append(next_page)

  #末页（若总页数只有一页，则无末页标签）
  if self.all_page > 1:
   last_page = "<li><a href=&#39;%s?page=%s&#39;>末页</a></li>" % (self.base_url, self.all_page)
   page_list.append(last_page)

  return &#39;&#39;.join(page_list)

Then, write the method in views (written here in app01):

from utils.pagnition import PageInfo # 从文件中导入上步自定义的分页模块

def custom(request):
 all_count = models.UserInfo.objects.all().count() 
 # 获取要显示数据库的总数据条数
 page_info = PageInfo(request.GET.get(&#39;page&#39;), all_count, &#39;/custom.html/&#39;,)  
 # 生成分页对象
 user_list = models.UserInfo.objects.all()[page_info.start_data():page_info.end_data()]  
 # 利用分页对象获取当前页显示数据
 return render(request, &#39;custom.html&#39;, {&#39;user_list&#39;: user_list, &#39;page_info&#39;: page_info}) 
 # 模板渲染

Then, write the "custom.html" file in the templates directory:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>customers</title>
{# 引入bootstrap样式#}
 <link rel="stylesheet" href="/static/plugins/bootstrap-3.3.7-dist/css/bootstrap.css">
</head>
<body>
<h1>customers</h1>
{#当前页显示的数据#}
<ul>
 {% for row in user_list %}
  <li>{{ row.name }}</li>
 {% endfor %}
</ul>

{#分页#}
 <nav aria-label="Page navigation">
  <ul class="pagination">
{#    传入page_info.pager#}
   {{ page_info.pager|safe }}
  </ul>
 </nav>

</body>
</html>

Finally, add the url relationship (urls.py):

 from django.conf.urls import url
 from django.contrib import admin
 from app01 import views as app01_views
 
 urlpatterns = [
  url(r&#39;^custom.html/$&#39;, app01_views.custom),
 ]

At this point, you have completed customizing the paging module using django's paging function, which can be applied to different business pages.

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