Django组件 分页器（paginator）

分页器

该分页的方法是Django自己提供的，以后会学习自定义分页，之后可以使用自定义分页的方法，因为可以曹村搜索条件

视图（views.py）

from django.shortcuts import render,HttpResponse

　　# Create your views here.
　　from app01.models import Book  # 假设models中有一个书籍表
　　from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

　　def index(request):
        '''
        批量导入数据:
        booklist = []
        for i in range(100):
            booklist.append(Book(title="book"+str(i), price=30+i*i))
        Book.objects.bulk_create(booklist)
        '''

        '''
        分页器的使用:
        book_list = Book.objects.all()
        paginator = Paginator(book_list, 10)   # 实例化对象，每页有10条数据

        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

        page1 = paginator.page(1)  # 第1页的page对象
        for i in page1:          # 遍历第1页的所有数据对象
            print(i)
        print(page1.object_list)  # 第1页的所有数据

        page2 = paginator.page(2)  # 第2页的page对象
    
        print(page2.has_next())            # 是否有下一页
        print(page2.has_previous())        # 是否有上一页
        print(page2.next_page_number())    # 下一页的页码
        print(page2.previous_page_number()) # 上一页的页码

        # 抛错
        # page = paginator.page(12)   # 超出范围的错误类型，error:EmptyPage
        # page = paginator.page("z")   # error:PageNotAnInteger

        '''
        book_list = Book.objects.all()
        paginator = Paginator(book_list, 10)
    
        current_page_num = request.GET.get('page', 1)

        try:
        currentPage = int(current_page_num)
            book_list = paginator.page(current_page_num)
        except (PageNotAnInteger, ValueError):
            book_list = paginator.page(1)   # 页码不是数字字符串，返回第一页
        currentPage = 1
        except EmptyPage:
            book_list = paginator.page(paginator.num_pages)  # 超范围，返回最后一页
        currentPage = paginator.num_pages

        return render(request, "index.html", {"book_list": book_list, "paginator": paginator, "currentPage": currentPage})

 模板（html）

<!DOCTYPE html>
　　<html lang="en">
　　<head>
　　　　<meta charset="UTF-8">
　　　　<title>paginator</title>
　　　　<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>

　　<div class="container">
        <h4>分页器</h4>
        <ul>
            {% for book in book_list %}
                 <li>{{ book.title }} ----- {{ book.price }}</li>
            {% endfor %}
        </ul>

        <ul class="pagination" id="pager">
            {% if book_list.has_previous %}
                <li class="previous"><a href="/index/?page={{ book_list.previous_page_number }}">上一页</a></li>
            {% else %}
                <li class="previous disabled"><a href="#">上一页</a></li>
            {% endif %}

            {% for num in paginator.page_range %}
                {% if num == currentPage %}
                    <li class="item active"><a href="/index/?page={{ num }}"> {{ num }} </a></li>
                {% else %}
                    <li class="item"><a href="/index/?page={{ num }}"> {{ num }} </a></li>
                {% endif %}
            {% endfor %}

            {% if book_list.has_next %}
                <li class="next"><a href="/index/?page={{ book_list.next_page_number }}">下一页</a></li>
            {% else %}
                <li class="next disabled"><a href="#">下一页</a></li>
            {% endif %}
        </ul>
　　</div>

　　</body>
　　</html>

 

分页扩展

def index(request):
        book_list = Book.objects.all()
        paginator = Paginator(book_list, 15)
        page = request.GET.get('page',1)
        currentPage = int(page)

        #  如果页数十分多时，换另外一种显示方式
        if paginator.num_pages>11:
            if currentPage - 5 < 1:
                pageRange = range(1,11)
            elif currentPage + 5 > paginator.num_pages:
                pageRange = range(currentPage - 5, paginator.num_pages + 1)
            else:
                pageRange = range(currentPage - 5, currentPage + 5)
        else:
            pageRange = paginator.page_range

        try:
            book_list = paginator.page(page)
        except PageNotAnInteger:
            currentPage = 1
            book_list = paginator.page(1)
        except EmptyPage:
            book_list = paginator.page(paginator.num_pages)
            currentPage = paginator.num_pages

        return render(request,"index.html",locals())

 

posted @ 2018-10-30 16:50  葡萄想柠檬  Views(166)  Comments(0)    收藏  举报
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