欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

Django框架 Pagination分页实现代码实例

程序员文章站 2023-08-22 19:47:25
一、自定义分页 1、基础版自定义分页 data = [] for i in range(1, 302): tmp = {"id": i,...

一、自定义分页

1、基础版自定义分页

data = []
 
for i in range(1, 302):
  tmp = {"id": i, "name": "alex-{}".format(i)}
  data.append(tmp)
 
print(data)
def user_list(request):
 
  # user_list = data[0:10]
  # user_list = data[10:20]
  try:
    current_page = int(request.get.get("page"))
  except exception as e:
    current_page = 1
 
  per_page = 10
 
  # 数据总条数
  total_count = len(data)
  # 总页码
  total_page, more = divmod(total_count, per_page)
  if more:
    total_page += 1
 
  # 页面最多显示多少个页码
  max_show = 11
  half_show = int((max_show-1)/2)
 
  if current_page <= half_show:
    show_start = 1
    show_end = max_show
  else:
    if current_page + half_show >= total_page:
      show_start = total_page - max_show
      show_end = total_page
    else:
      show_start = current_page - half_show
      show_end = current_page + half_show
 
  # 数据库中获取数据
  data_start = (current_page - 1) * per_page
  data_end = current_page * per_page
 
  user_list = data[data_start:data_end]
 
  # 生成页面上显示的页码
  page_html_list = []
  # 加首页
  first_li = '<li><a href="/user_list/?page=1" rel="external nofollow" >首页</a></li>'
  page_html_list.append(first_li)
  # 加上一页
  if current_page == 1:
    prev_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a></li>'
  else:
    prev_li = '<li><a href="/user_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a></li>'.format(current_page - 1)
  page_html_list.append(prev_li)
  for i in range(show_start, show_end+1):
    if i == current_page:
      li_tag = '<li class="active"><a href="/user_list/?page={0}" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i)
    else:
      li_tag = '<li><a href="/user_list/?page={0}" rel="external nofollow" rel="external nofollow" >{0}</a></li>'.format(i)
    page_html_list.append(li_tag)
 
  # 加下一页
  if current_page == total_page:
    next_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a></li>'
  else:
    next_li = '<li><a href="/user_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a></li>'.format(current_page+1)
  page_html_list.append(next_li)
 
  # 加尾页
  page_end_li = '<li><a href="/user_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>'.format(total_page)
  page_html_list.append(page_end_li)
 
  page_html = "".join(page_html_list)
 
  return render(request, "user_list.html", {"user_list": user_list, "page_html": page_html})

2、封装保存版

class pagination(object):
  def __init__(self, current_page, total_count, base_url, per_page=10, max_show=11):
    """
    :param current_page: 当前页
    :param total_count: 数据库中数据总数
    :param per_page: 每页显示多少条数据
    :param max_show: 最多显示多少页
    """
    try:
      current_page = int(current_page)
    except exception as e:
      current_page = 1
 
    self.current_page = current_page
    self.total_count = total_count
    self.base_url = base_url
    self.per_page = per_page
    self.max_show = max_show
 
    # 总页码
    total_page, more = divmod(total_count, per_page)
    if more:
      total_page += 1
     
    half_show = int((max_show - 1) / 2)
    self.half_show = half_show
    self.total_page = total_page
 
  @property
  def start(self):
    return (self.current_page - 1) * self.per_page
 
  @property
  def end(self):
    return self.current_page * self.per_page
 
  def page_html(self):
 
    if self.current_page <= self.half_show:
      show_start = 1
      show_end = self.max_show
    else:
      if self.current_page + self.half_show >= self.total_page:
        show_start = self.total_page - self.max_show
        show_end = self.total_page
      else:
        show_start = self.current_page - self.half_show
        show_end = self.current_page + self.half_show
 
        # 生成页面上显示的页码
    page_html_list = []
    # 加首页
    first_li = '<li><a href="{}?page=1" rel="external nofollow" >首页</a></li>'.format(self.base_url)
    page_html_list.append(first_li)
    # 加上一页
    if self.current_page == 1:
      prev_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a></li>'
    else:
      prev_li = '<li><a href="{0}?page={1}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a></li>'.format(self.base_url, self.current_page - 1)
    page_html_list.append(prev_li)
    for i in range(show_start, show_end + 1):
      if i == self.current_page:
        li_tag = '<li class="active"><a href="{0}?page={1}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{1}</a></li>'.format(self.base_url, i)
      else:
        li_tag = '<li><a href="{0}?page={1}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >{1}</a></li>'.format(self.base_url, i)
      page_html_list.append(li_tag)
     # 加下一页
    if self.current_page == self.total_page:
      next_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a></li>'
    else:
      next_li = '<li><a href="{0}?page={1}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a></li>'.format(self.base_url, self.current_page + 1)
    page_html_list.append(next_li)
 
    # 加尾页
    page_end_li = '<li><a href="{0}?page={1}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾页</a></li>'.format(self.base_url, self.total_page)
    page_html_list.append(page_end_li)
     return "".join(page_html_list)

3、封装保存版使用指南

def user_list(request):
  pager = pagination(request.get.get("page"), len(data), request.path_info)
  user_list = data[pager.start:pager.end]
  page_html = pager.page_html()
  return render(request, "user_list.html", {"user_list": user_list, "page_html": page_html})

二、django内置分页

1、内置分页view部分

from django.shortcuts import render
from django.core.paginator import paginator, emptypage, pagenotaninteger
l = []
for i in range(999):
  l.append(i)
def index(request):
  current_page = request.get.get('p')
  paginator = paginator(l, 10)
  # per_page: 每页显示条目数量
  # count:  数据总个数
  # num_pages:总页数
  # page_range:总页数的索引范围,如: (1,10),(1,200)
  # page:   page对象
  try:
    posts = paginator.page(current_page)
    # has_next       是否有下一页
    # next_page_number   下一页页码
    # has_previous     是否有上一页
    # previous_page_number 上一页页码
    # object_list      分页之后的数据列表
    # number        当前页
    # paginator       paginator对象
  except pagenotaninteger:
    posts = paginator.page(1)
  except emptypage:
    posts = paginator.page(paginator.num_pages)
  return render(request, 'index.html', {'posts': posts}) 

2、内置分页html部分

<!doctype html>
<html>
<head lang="en">
  <meta charset="utf-8">
  <title></title>
</head>
<body>
<ul>
  {% for item in posts %}
    <li>{{ item }}</li>
  {% endfor %}
</ul>
 
<div class="pagination">
   <span class="step-links">
    {% if posts.has_previous %}
      <a href="?p={{ posts.previous_page_number }}" rel="external nofollow" >previous</a>
    {% endif %}
     <span class="current">
      page {{ posts.number }} of {{ posts.paginator.num_pages }}.
     </span>
     {% if posts.has_next %}
       <a href="?p={{ posts.next_page_number }}" rel="external nofollow" >next</a>
     {% endif %}
   </span>
</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。