ColinSpace Site

1、函数视图分页

from django.core.paginator import Paginator
from django.shortcuts import render
from .models import Post 

def index(request):
    posts = Post.objects.all()
    paginator = Paginator(posts, 15)
    # 默认一般都是使用page参数
    page_number = request.GET.get('page')
    page_obj = paginator.get_page(page_number)
    return render(request, 'blog/index.html', {'page_obj': page_obj})

2、类视图分页

from django.views.generic import ListView
from .models import Post 

class IndexListView(ListView):
    # 关联模型
    model = Post
    # 模板名称，默认推导为 index_list.html
    template_name = 'blogv3/index.html'
    # 模板中的对象名称，默认为 object_list
    context_object_name = 'posts'
    # 限制请求方法
    http_method_names = ['get']
    # 设置分页
    paginate_by = 15
    
    # 可以通过get_context_data获取到分页信息，当然前提是设置了 paginate_by
    # def get_context_data(self, *args, **kwargs):
    #     context = super().get_context_data(*args, **kwargs)
    #     print(context)
    #     return context

上述调试中获取的到context内容为

{
	'paginator': <django.core.paginator.Paginator object at 0x104ff4160>, 
  'page_obj': <Page 1 of 4>, 
  'is_paginated': True, 
  'object_list': <QuerySet [... ...]>, 
  'view': <blogv3.views.IndexListView object at 0x104ff43a0>
  }

说明：

• paginator Django的分页对象
• page_obj 当前页参数， 实际在template中判断的时候使用的就是该对象
• is_paginated 是否分页
• object_list 对象名称，context_object_name 定义了posts ，两者效果等效
• view 视图名称

template中配置实际分页信息

<div class="container navigation">
    {% if page_obj.has_previous %}
    <a class="navigate pull-left" href="?page={{ page_obj.previous_page_number }}"><i class="fa fa-caret-left"></i> <<< 更 新</a>
    {% endif %}
      
    <!-- 当然有时候这里也可以显示当前页码 -->
    <span>Current Page {{ page_obj.number }} of {{ page_obj.paginator.num_pages }} </span>
    
    {% if page_obj.has_next %}
    <a class="navigate pull-right" href="?page={{ page_obj.next_page_number }}">更 多 >>> <i class="fa fa-caret-right"></i></a>
    {% endif %}
</div>

附加：

Paginator常用的属性和方法

• count 总共有多少条记录
• num_pages 总共有多少页
• page_range 页面的区间

Page 常用属性和方法

• has_next
• has_previous
• next_page_number
• previous_page_number
• number 当前页
• start_index 当前页的第一条记录的索引值
• end_index 当前页的最后一条记录的索引值

Paginator 练习

(django_exercise_book) [ 22-04-02 11:08 ] [ colinspace ] python manage.py shell
Python 3.9.6 (default, Jul 16 2021, 13:41:17)
[Clang 12.0.5 (clang-1205.0.22.11)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.core.paginator import Paginator
>>> obj_list = ['apple', 'orange', 'banana', 'tomato', 'pear' ]
>>> paginator = Paginator(obj_list, 2)
>>> paginator
<django.core.paginator.Paginator object at 0x106cf8130>
>>> paginator.
paginator.ELLIPSIS                paginator.get_page(               paginator.page(
paginator.allow_empty_first_page  paginator.num_pages               paginator.page_range
paginator.count                   paginator.object_list             paginator.per_page
paginator.get_elided_page_range(  paginator.orphans                 paginator.validate_number(
>>> paginator.count
5
>>> paginator.num_pages
3
>>> paginator.per_page
2
>>> paginator.page_range
range(1, 4)
>>> paginator.object_list
['apple', 'orange', 'banana', 'tomato', 'pear']
>>>
>>>
>>> page1 = paginator.page(2)
>>> page2 = paginator.page(2)
>>>
>>> page2
<Page 2 of 3>
>>> page2.
page2.count(                 page2.has_other_pages(       page2.next_page_number(      page2.paginator
page2.end_index(             page2.has_previous(          page2.number                 page2.previous_page_number(
page2.has_next(              page2.index(                 page2.object_list            page2.start_index(
>>> page2.has_previous()
True
>>> page2.has_next()
True
>>> page2.number
2
>>> page2.has_other_pages()
True
>>> page2.next_page_number()
3
>>> page2.previous_page_number()
1
>>> page2.start_index()
3
>>> page2.end_index()
4
>>>

参考：
https://docs.djangoproject.com/en/3.2/topics/pagination/