Python之路【第三十二篇】:django 分页器

Django的分页器paginator

文件为pageDemo

models.py

from django.db import models

# Create your models here.
class Book(models.Model):
    title = models.CharField(max_length=32)
    price = models.DecimalField(decimal_places=2, max_digits=8)

views.py

from django.shortcuts import render

# Create your views here.
from .models import Book
from django.core.paginator import Paginator, EmptyPage
def index(request):
    '''
    批量导入:  #批量导入数据库文件里边
    book_list = []
    for i in range(100):
        book = Book(title="book_%s"%i, price=i*i) #实例化一个book对象；
        book_list.append(book)                    #实例化出100个对象；
    Book.objects.bulk_create(book_list)           #批量插入
    return render(request, "index.html")
    :param request:
    :return:
    '''
    book_list = Book.objects.all()  #拿到所有书籍数据
    #分页器
    paginator = Paginator(book_list, 8) #对谁分页，一页显示多少条数据 总的分页器对象
    print("count:",paginator.count)           #数据总数  打印：count:100
    print("num_pages",paginator.num_pages)    #总页数　　　　　num_pages:13
    print("page_range",paginator.page_range)  #页码的列表 　　 page_range range(1,14)

    try: #page数字超了或者不在那个返回里就会抛出一个EmptyPage的错误
        current_page_num = int(request.GET.get("page", 1))  #做成一个动态的效果。给它个默认值拿第一页，不加1就会返回一个None。当前想要的第几页的数据
        current_page = paginator.page(current_page_num)     #拿到第几页的page对象。
        #显示某一页具体数据的两种方式：
        print("object_list", current_page.object_list)
        for i in current_page:
            print(i)
    except EmptyPage as e:
        current_page=paginator.page(1)     #拿到第一页的page对象
    return render(request, "index.html", locals())

 

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
    <ul>
        {% for book in current_page %} 
        <li>{{ book.title }}:{{ book.price }}</li> 
        {% endfor %}
    </ul>

    <nav aria-label="Page navigation">  //分页的页面
        <ul class="pagination">
            {% if current_page.has_previous %} //上一页：当前页码-1 ---> href="?page={{current_page_num|add:-1}}或者下面这种写法 ；判断当前页是否还有上一页、下一页
            <li><a href="?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>  //没有上一页就不
            {% endif %}


            {% for item in paginator.page_range %}  //item为数字  这里不该写死-->page_range
                {% if current_page_num == item %}
                    <li class="active"><a href="?page={{ item }}">{{ item }}</a></li>  //也当前页码匹配成功了，加个class="active" 一点击谁颜色就会变深
                {% else %}
                    <li><a href="?page={{ item }}">{{ item }}</a></li>
                {% endif %}
            {% endfor %}

            {% if current_page.has_next %}
                <li><a href="?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>
</body>
</html>

 

 改进版

views

from django.shortcuts import render

# Create your views here.
from .models import Book
from django.core.paginator import Paginator, EmptyPage
def index(request):
    '''
    批量导入:
    book_list = []
    for i in range(100):
        book = Book(title="book_%s"%i, price=i*i)
        book_list.append(book)
    Book.objects.bulk_create(book_list)  #匹配插入
    return render(request, "index.html")
    :param request:
    :return:
    '''
    book_list = Book.objects.all()
    #分页器
    paginator = Paginator(book_list, 3)
    print("count:",paginator.count)           #数据总数
    print("num_pages",paginator.num_pages)    #总页数
    print("page_range",paginator.page_range)  #页码的列表

    current_page_num = int(request.GET.get("page", 1))
    if paginator.num_pages>11:
        if current_page_num-5 < 1:                     ##点1、2、3、4、5页码不动，点7开始显示左5右5
            page_range = range(1, 12)
        elif current_page_num+5 > paginator.num_pages: #如果大于最大页码数
            page_range = range(paginator.num_pages-10, paginator.num_pages+1)
        else:
           
    else:
        current_page = paginator.page_range

    try:
        current_page_num = int(request.GET.get("page", 1))
        current_page = paginator.page(current_page_num)
        #显示某一页具体数据的两种方式：
        print("object_list", current_page.object_list)
        for i in current_page:
            print(i)
    except EmptyPage as e:
        current_page=paginator.page(1)
    return render(request, "index.html", locals())

 

index.html

{% for item in page_range %}  不应该写死，其他同上
                {% if current_page_num == item %}
                    <li class="active"><a href="?page={{ item }}">{{ item }}</a></li>
                {% else %}
                    <li><a href="?page={{ item }}">{{ item }}</a></li>
                {% endif %}
            {% endfor %}

posted @ 2020-02-16 17:32  Simon92  阅读(327)  评论(0)  编辑  收藏  举报