Django_Paginator分页器

分页器代码说明

import os
import random
# 需要导入分页器类

from django.core.paginator import Paginator, EmptyPage


# 导入配置django配置文件
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'dailyfresh.settings')


iterable_obj = [random.randint(1, 100) for i in range(45)]   # 必须为可迭代对象，比如 QuerySet, list, tuple
print(iterable_obj)
# 实例化分页器
paginator = Paginator(object_list=iterable_obj, per_page=20)

# 每页显示数据量
print("每页显示数据量:%s" % paginator.per_page)
# 总页数
print("总页数:%s" % paginator.num_pages)
# 数据总数
print("数据总数:%s" % paginator.count)

# 获取某页的page对象，如果为不存在的页码会抛EmptyPage异常
try:
    page_obj = paginator.page(random.randint(1, 4))
except EmptyPage:
    page_obj = paginator.page(1)
    print("[异常]获取page对象超出范围")
print(page_obj)
print("通过page对象获取分页器实例", page_obj.paginator)

# 获取当前页码
print("获取当前页码:%s" % page_obj.number)
# 获取当前页内容
print("获取当前页内容:%s" % page_obj.object_list)

# 校验是否有上一页，返回布尔值
print("是否有上一页：%s" % page_obj.has_previous())
# 上一页页码。如果无上一页，则抛错
print("上一页页码：%s" % page_obj.previous_page_number())

# 校验是否有下一页，返回布尔值
print("是否有下一页:%s" % page_obj.has_next())
# 下一页页码。如果无下一页，则抛错
print("下一页页码：%s" % page_obj.next_page_number())

执行结果如下：

简单demo

定义视图

from django.views import View


class DemoView(View):

    def get(self, request, page_num):
        iterable_obj = [i for i in range(45)]
        # 对数据进行分页
        paginator = Paginator(iterable_obj, 10)
        cur_page = paginator.page(page_num)
        content = {
            "cur_page": cur_page,
        }
        return render(request, "demo.html", content)

添加路由

from django.urls import re_path, path
from apps.goods import views
# 定义命名空间
app_name = "goods"

urlpatterns = [
    re_path("demo_list/(?P<page_num>\d+)", views.DemoView.as_view(), name="demo_list")
]

添加demo.html模板

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!-- 展示每页信息 -->
<ul>
    {% for v in cur_page.object_list %}
        <li>{{v}}</li>
    {% endfor %}
</ul>

<!-- 生成页码信息 -->
<div>
    {% if cur_page.has_previous %}
        <a href="{% url 'goods:demo_list' cur_page.previous_page_number %}">上一页</a>
    {% endif %}

    {% for page_num in cur_page.paginator.page_range %}
        <a href="{% url 'goods:demo_list' page_num %}">{{ page_num }}</a>
    {% endfor %}

    {% if cur_page.has_next %}
         <a href="{% url 'goods:demo_list' cur_page.next_page_number %}">下一页</a>
    {% endif %}
</div>
</body>
</html>

界面第5页展示如下：

 

posted @ 2022-06-18 16:32  码上测  阅读(114)  评论(0)    收藏  举报