爱站程序员基地[toc]
Django 分页器
在页面显示分页数据，需要用到Django分页器组件
先看效果图：
使用分页器需要导入模块
- 导入：
from django.core.paginator import Paginator
方法介绍
Paginator对象：paginator = Paginator(user_list, 10) # 传入分页数据，和展示的条数# 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page对象：page=paginator.page(1)# 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
示例
\'\'\'urls.py\'\'\'from django.contrib import adminfrom django.urls import pathfrom app01 import viewsurlpatterns = [path(\'admin/\', admin.site.urls),path(\'user_list/\',views.user_page),path(\'delete/\',views.delete),]
\'\'\'views.py\'\'\'from django.core.paginator import Paginatorfrom django.shortcuts import render, redirectfrom app01 import modelsdef user_page(request):user_page_num = int(request.GET.get(\'page_num\', 1)) # 用户不传页码默认为1user_list = models.User.objects.all() # 获取所有数据\'\'\'Paginator 对象\'\'\'# 实例化paginator = Paginator(user_list, 10) # 分页的数据，每页显示十行# print(paginator.count) # 总条数 500# print(paginator.num_pages) # 总页数 50# print(paginator.per_page) # 每页显示条数 10# print(paginator.page_range) # 生成器，next拿一页 range(1,51)# print(paginator.page(1)) # page(1)第一页，()内写几可以拿到的页# 判断页码数和11的关系，布局\'\'\'Page对象\'\'\'try:page = paginator.page(user_page_num) # 获取当前页# print(page.has_next()) # 判断有没有下一页 True# print(page.next_page_number()) # 下一页页码数 3# print(page.has_previous()) # 判断有没有上一页 True# print(page.previous_page_number()) # 上一页页码 1# print(paginator.object_list) # 获取该页的所有数据的对象except Exception as e:user_page_num = paginator.num_pages # 如果没有搜索页设置默认数显示最后一页page = paginator.page(user_page_num) # 没有搜索页显示最后一页# print(page.number) # 获取当前页码 2if paginator.num_pages > 11:# 开头的判断，如果当前页-5小于1，那么显示1，12if user_page_num - 5 < 1:page_range = range(1, 12)# 末尾的判断，如果当前页+5大于总页码数，回退11elif user_page_num + 5 > paginator.num_pages:page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)# 中间当前页-5，+6else:page_range = range(user_page_num - 5, user_page_num + 6)else:page_range = paginator.page_range # 如果小于11那么就显示少有的对象return render(request, \'user_page.html\', locals())def delete(request):del_id = request.GET.get(\'del_id\')# is_delete = 0models.User.objects.filter(pk=del_id).delete()# models.User.objects.filter(pk=del_id).update(is_delete=1)import timetime.sleep(3)return redirect(\'/user_list/\')
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title><script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.4.1/jquery.min.js"></script><link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet"><script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js"></script><script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script></head><body>{#数据#}<div class="container"><h1 style="text-align: center">Uesr-Info</h1><div class="row"><div class="col-md-8 col-md-offset-2"><div><table class="table table-striped table-hover"><thead><tr><th>id</th><th>name</th><th>phone</th><th>address</th><th>action</th></tr></thead><tbody>{# 获取当前页的所有对象 #}{% for user in page.object_list %}<tr><td>{{ user.id }}</td><td>{{ user.name }}</td><td>{{ user.phone }}</td><td>{{ user.address }}</td><td class="btn btn-danger btn-xs"><a href="/delete/?del_id={{ user.id }}" id="del">删除</a></td></tr>{% endfor %}</tbody></table></div></div></div></div>{#分页#}<nav aria-label="Page navigation" class="text-center"><ul class="pagination">{# 判断是否有上一页 #}{% if page.has_previous %}<li><a href="/user_list/?page_num={{ page.previous_page_number }}" aria-label="Previous"><span aria-hidden="true">«</span></a></li>{% else %}<li class="disabled"><a href="" aria-label="Previous"><span aria-hidden="true">«</span></a></li>{% endif %}{# for循环拿到页码数 #}{% for foo in page_range %}{% if user_page_num == foo %}<li class="active"><a href="/user_list/?page_num={{ foo }}">{{ foo }}</a></li>{% else %}<li><a href="/user_list/?page_num={{ foo }}">{{ foo }}</a></li>{% endif %}{% endfor %}{# 判断是否有下一页 #}{% if page.has_next %}<li><a href="/user_list/?page_num={{ page.next_page_number }}" aria-label="Next"><span aria-hidden="true">»</span></a></li>{% else %}<li class="disabled"><a href="" aria-label="Next"><span aria-hidden="true">»</span></a></li>{% endif %}</ul></nav></body><script>$(\'#del\').click(function () {swal({title: "确定要删除吗?",text: "删除一条数据",icon: "warning",buttons: true,dangerMode: true,}).then((willDelete) => {if (willDelete) {swal("删除成功", {icon: "success",});} else {swal("取消删除");}});})</script></html>
分页器模板
class Pagination(object):def __init__(self, current_page, all_count, per_page_num=2, pager_count=5):"""封装分页相关数据:param current_page: 当前页:param all_count: 数据库中的数据总条数:param per_page_num: 每页显示的数据条数:param pager_count: 最多显示的页码个数"""try:current_page = int(current_page)except Exception as e:current_page = 1if current_page < 1:current_page = 1self.current_page = current_pageself.all_count = all_countself.per_page_num = per_page_num# 总页码all_pager, tmp = divmod(all_count, per_page_num)if tmp:all_pager += 1self.all_pager = all_pagerself.pager_count = pager_countself.pager_count_half = int((pager_count - 1) / 2)@propertydef start(self):return (self.current_page - 1) * self.per_page_num@propertydef end(self):return self.current_page * self.per_page_numdef page_html(self):# 如果总页码 < 11个：if self.all_pager <= self.pager_count:pager_start = 1pager_end = self.all_pager + 1# 总页码 > 11else:# 当前页如果<=页面上最多显示11/2个页码if self.current_page <= self.pager_count_half:pager_start = 1pager_end = self.pager_count + 1# 当前页大于5else:# 页码翻到最后if (self.current_page + self.pager_count_half) > self.all_pager:pager_end = self.all_pager + 1pager_start = self.all_pager - self.pager_count + 1else:pager_start = self.current_page - self.pager_count_halfpager_end = self.current_page + self.pager_count_half + 1page_html_list = []# 添加前面的nav和ul标签page_html_list.append(\'\'\'<nav aria-label=\'Page navigation>\'<ul class=\'pagination\'>\'\'\')first_page = \'<li><a href="?page=%s">首页</a></li>\' % (1)page_html_list.append(first_page)if self.current_page <= 1:prev_page = \'<li class="disabled"><a href="#">上一页</a></li>\'else:prev_page = \'<li><a href="?page=%s">上一页</a></li>\' % (self.current_page - 1,)page_html_list.append(prev_page)for i in range(pager_start, pager_end):if i == self.current_page:temp = \'<li class="active"><a href="?page=%s">%s</a></li>\' % (i, i,)else:temp = \'<li><a href="?page=%s">%s</a></li>\' % (i, i,)page_html_list.append(temp)if self.current_page >= self.all_pager:next_page = \'<li class="disabled"><a href="#">下一页</a></li>\'else:next_page = \'<li><a href="?page=%s">下一页</a></li>\' % (self.current_page + 1,)page_html_list.append(next_page)last_page = \'<li><a href="?page=%s">尾页</a></li>\' % (self.all_pager,)page_html_list.append(last_page)# 尾部添加标签page_html_list.append(\'\'\'</nav></ul>\'\'\')return \'\'.join(page_html_list)
