分页器的介绍

一 、分页器的简介

  在页面显示分页数据,需要用到django分页器组件 

  from django.core.paginator import Paginator

paginator对象:paginator = Paginator(user_list,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),(1,100)

page:  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

二、应用view层

 

from django.shortcuts import render,HttpResponse

# Create your views here.
from app01.models import *
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
# 创建100行的数据
def index(request):
l1 = []
for i in range(100):
l1.append(models.Book(name='图书%s'%i, price=10+i))
# 批量插入,两个 参数,第一个是对象 列表,第二个是一次插入到数据量,
# 不填,默认一次全插入
models.Book.objects.bulk_create(l1)
return HttpResponse('ok')

'''
# 查询所有图书
book_list=models.Book.objects.all()
# 分页器--类
# 实例化产生 一个对象
# 两个参数 :object_list:对象列表,pre_page:每页显示的条数
paginator=Paginator(book_list,10)
# 对象内的属性
# 数据总条数 100条
print(paginator.count)
# 总页数10页
print(paginator.num_pages)
# 页码数的列表
print(paginator.page_range)
# 取到第x页,返回一个Page 对象
current_page=paginator.page(5)
# 当前页码内的所有数据
print(current_page.object_list)
# 是否有下一页
print(current_page.has_next())
# 是否有上一页
print(current_page.has_previous())
# 下一页页码数
print(current_page.next_page_number())
# 上一页页码数
print(current_page.previous_page_number())
return render(request,'index.html',locals())

'''

实例 :

from django.shortcuts import render, HttpResponse

# Create your views here.

from app01 import models
from django.core.paginator import Paginator, EmptyPage


# def index(request):
# l1 = []
# for i in range(100):
#     l1.append(models.Book(name='图书%s'%i, price=10+i))
#     # 批量插入,两个 参数,第一个是对象 列表,第二个是一次插入到数据量,
#     # 不填,默认一次全插入
# models.Book.objects.bulk_create(l1)
# return HttpResponse('ok')


def index_next(request):
    book_list = models.Book.objects.all()
    paginator = Paginator(book_list, 10)
    # 如果页码数多,让它显示前5,后5,中间是 当前 所在的页码
    try:
        current_page_num = int(request.GET.get('page'))
        current_page = paginator.page(current_page_num)
        print(current_page.object_list)
        # 总页数,大于11的时候
        if paginator.num_pages > 11:
            # 当前页码数-5大于1的时候,page_range应该是?
            if current_page_num - 5 < 1:
                page_range = range(1, 12)
            elif current_page_num + 5 > paginator.num_pages:
                # 当前页码数+5大于总页码数,总页码数 往前推11个
                page_range = range(paginator.num_pages - 10, paginator.num_pages + 1)
            else:
                page_range = range(current_page_num - 5, current_page_num + 6)
        else:
            # 小于11,有多少页,就显示多少页
            page_range = paginator.page_range
    except Exception as e:
        current_page_num = 1
        current_page = paginator.page(current_page_num)
    return render(request, 'index_next.html', locals())
View 层
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css"
          integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <title>Title</title>
</head>
<body>
<div class="row">
    <div class="col-md-6 col-md-offset-3">
       <table class="table table-striped">
            <thead>
            <tr>
                <th>书名</th>
                <th>价格</th>
            </tr>
            </thead>
            <tbody>
            {% for book in current_page %}
                <tr>
                    <td>{{ book.name }}</td>
                    <td>{{ book.price }}</td>
                </tr>
            {% endfor %}

            </tbody>
        </table>
        <nav aria-label="Page navigation">
            <ul class="pagination">
                {% if current_page.has_previous %}
                    <li>
                        {#                    <a href="/index/?page={{ current_page_num|add:-1 }}" aria-label="Previous">#}
                        <a href="/index/?page={{ current_page.previous_page_number }}" aria-label="Previous">
                            <span aria-hidden="true">上一页</span>
                        </a>
                    </li>
                {% else %}
                    <li class="disabled">
                        <a href="" aria-label="Previous">
                            <span aria-hidden="true">上一页</span>
                        </a>
                    </li>
                {% endif %}
                {% for foo in paginator.page_range %}
                    {% if current_page_num == foo %}
                        {# 当前页码等于循环到的页码数,变色#}
                        <li class="active"><a href="/index/?page={{ foo }}">{{ foo }}</a></li>
                    {% else %}
                        <li><a href="/index/?page={{ foo }}">{{ foo }}</a></li>
                    {% endif %}
                {% endfor %}
                {% if current_page.has_next %}
                    <li>
                        {#                    <a href="/index/?page={{ current_page_num|add:1 }}" aria-label="Next">#}
                        <a href="/index/?page={{ current_page.next_page_number }}" aria-label="Next">
                            <span aria-hidden="true">下一页</span>
                        </a>
                    </li>
                {% else %}
                    <li class="disabled">
                        <a href="" aria-label="Next">
                            <span aria-hidden="true">下一页</span>
                        </a>
                    </li>
                {% endif %}
            </ul>
        </nav>
    </div>
</div>
</body>
</html>
模板层

 

posted @ 2018-11-20 17:19  薛才昌  阅读(353)  评论(0编辑  收藏  举报