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Django框架 Pagination分頁(yè)實(shí)現(xiàn)代碼實(shí)例

發(fā)布時(shí)間：2020-10-09 12:54:59 來(lái)源：腳本之家 閱讀：144 作者：高~雅 欄目：開(kāi)發(fā)技術(shù)

一、自定義分頁(yè)

1、基礎(chǔ)版自定義分頁(yè)

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
 
  # 數(shù)據(jù)總條數(shù)
  total_count = len(data)
  # 總頁(yè)碼
  total_page, more = divmod(total_count, per_page)
  if more:
    total_page += 1
 
  # 頁(yè)面最多顯示多少個(gè)頁(yè)碼
  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
 
  # 數(shù)據(jù)庫(kù)中獲取數(shù)據(jù)
  data_start = (current_page - 1) * per_page
  data_end = current_page * per_page
 
  user_list = data[data_start:data_end]
 
  # 生成頁(yè)面上顯示的頁(yè)碼
  page_html_list = []
  # 加首頁(yè)
  first_li = '<li><a href="/user_list/?page=1" rel="external nofollow" >首頁(yè)</a></li>'
  page_html_list.append(first_li)
  # 加上一頁(yè)
  if current_page == 1:
    prev_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一頁(yè)</a></li>'
  else:
    prev_li = '<li><a href="/user_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一頁(yè)</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)
 
  # 加下一頁(yè)
  if current_page == total_page:
    next_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一頁(yè)</a></li>'
  else:
    next_li = '<li><a href="/user_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一頁(yè)</a></li>'.format(current_page+1)
  page_html_list.append(next_li)
 
  # 加尾頁(yè)
  page_end_li = '<li><a href="/user_list/?page={}" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾頁(yè)</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、封裝保存版

class Pagination(object):
  def __init__(self, current_page, total_count, base_url, per_page=10, max_show=11):
    """
    :param current_page: 當(dāng)前頁(yè)
    :param total_count: 數(shù)據(jù)庫(kù)中數(shù)據(jù)總數(shù)
    :param per_page: 每頁(yè)顯示多少條數(shù)據(jù)
    :param max_show: 最多顯示多少頁(yè)
    """
    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
 
    # 總頁(yè)碼
    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
 
        # 生成頁(yè)面上顯示的頁(yè)碼
    page_html_list = []
    # 加首頁(yè)
    first_li = '<li><a href="{}?page=1" rel="external nofollow" >首頁(yè)</a></li>'.format(self.base_url)
    page_html_list.append(first_li)
    # 加上一頁(yè)
    if self.current_page == 1:
      prev_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一頁(yè)</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" >上一頁(yè)</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)
     # 加下一頁(yè)
    if self.current_page == self.total_page:
      next_li = '<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一頁(yè)</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" >下一頁(yè)</a></li>'.format(self.base_url, self.current_page + 1)
    page_html_list.append(next_li)
 
    # 加尾頁(yè)
    page_end_li = '<li><a href="{0}?page={1}" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >尾頁(yè)</a></li>'.format(self.base_url, self.total_page)
    page_html_list.append(page_end_li)
     return "".join(page_html_list)

3、封裝保存版使用指南

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內(nèi)置分頁(yè)

1、內(nèi)置分頁(yè)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: 每頁(yè)顯示條目數(shù)量
  # count:  數(shù)據(jù)總個(gè)數(shù)
  # num_pages:總頁(yè)數(shù)
  # page_range:總頁(yè)數(shù)的索引范圍，如: (1,10),(1,200)
  # page:   page對(duì)象
  try:
    posts = paginator.page(current_page)
    # has_next       是否有下一頁(yè)
    # next_page_number   下一頁(yè)頁(yè)碼
    # has_previous     是否有上一頁(yè)
    # previous_page_number 上一頁(yè)頁(yè)碼
    # object_list      分頁(yè)之后的數(shù)據(jù)列表
    # number        當(dāng)前頁(yè)
    # paginator       paginator對(duì)象
  except PageNotAnInteger:
    posts = paginator.page(1)
  except EmptyPage:
    posts = paginator.page(paginator.num_pages)
  return render(request, 'index.html', {'posts': posts})　

2、內(nèi)置分頁(yè)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>

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