知识预览

分页

Django的分页器（paginator）

view

from django.shortcuts import render, HttpResponse
from app01.models import Book
from django.core.paginator import Paginator, EmptyPage
from app01.utils.pagination import Pagination

  def index(request):

     # 创建数据

     # book_list = [Book(title='Hello Python',price=price) for price in range()]

     # res = Book.objects.bulk_create(book_list)  # 批量创建，效率高

     # print(res)

     book_list = Book.objects.all()

     # return HttpResponse('ok')

     paginator = Paginator(book_list, )

     # 打印

     print('数据总数：', paginator.count)  #

     print('总页数：', paginator.num_pages)  #

     print('页码列表：', paginator.page_range)  # range(, )

     current_page_num = int(request.GET.get('page', ))

     if paginator.num_pages > :

         if current_page_num -  < :

             p1 =

             p2 =

         elif current_page_num +  > paginator.num_pages:

             p1 = paginator.num_pages -

             p2 = paginator.num_pages +

         else:

             p1 = current_page_num -

             p2 = current_page_num +

         page_range = range(p1, p2)

     else:

         page_range = paginator.page_range

     try:

         current_page = paginator.page(current_page_num)  # 第几页的数据

     except EmptyPage as e:

         current_page = paginator.page()

     return render(request, 'book_list.html', locals())

<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>书籍列表</title>
    <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">

</head>
<body>

<ul>
    {% for book in current_page %}
        <li>名称：{{ book.title }}----价格：{{ book.price }}</li>
        <br>
    {% endfor %}

</ul>

<nav aria-label="Page navigation">
    <ul class="pagination">
        {% if current_page.has_previous %}
            <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>
        {% endif %}

        {% for num in page_range %}
            {% if current_page_num == num %}
                <li class="active"><a href="?page={{ num }}">{{ num }}</a></li>
            {% else %}
                <li><a href="?page={{ num }}">{{ num }}</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="Previous"><span aria-hidden="true">上一页</span></a>
            </li>
        {% endif %}

    </ul>
</nav>

</body>
</html>

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>30:

        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:

        print(page)

        book_list = paginator.page(page)

    except PageNotAnInteger:

        book_list = paginator.page(1)

    except EmptyPage:

        book_list = paginator.page(paginator.num_pages)

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

自定义分页器

class Pagination(object):

    def __init__(self, current_page, all_count, base_url, per_page_num=10, page_count=11):
        """
        封装分页相关数据
        :param current_page: 当前页
        :param all_count: 数据库的数据总条数
        :param base_url:分页显示的url前缀
        :param per_page_num:每页显示的数据条数
        :param page_count:最多显示的页码数
        """

        try:
            current_page = int(current_page)
        except Exception as e:
            # 当输入的页码不是正经数字的时候，默认返回第一页数据
            current_page = 1

        if current_page < 1:
            current_page = 1

        self.current_page = current_page
        self.all_count = all_count
        self.base_url = base_url
        self.per_page_num = per_page_num
        self.page_count = page_count
        self.page_count_half = int(page_count) // 2

        # 总页码
        all_page, tmp = divmod(all_count, per_page_num)  # 7,6 = div(90,12)
        # 如果有多余，加一页：
        if tmp:
            all_page += 1
        self.all_page = all_page

    @property
    def start(self):
        # 从哪开始
        return (self.current_page - 1) * self.per_page_num

    @property
    def end(self):
        # 到哪结束
        return self.current_page * self.per_page_num

    def page_html(self):
        # 如果总页码 <= 11:
        if self.all_page <= self.page_count:
            page_start = 1
            page_end = self.all_page + 1
        # 如果页码数 > 11:
        else:
            # 如果当前页 <= self.page_count_half
            if self.current_page <= self.page_count_half:
                page_start = 1
                page_end = self.page_count + 1
            # 当前页大于5
            else:
                # 页码翻到最后
                if (self.current_page + self.page_count_half) > self.all_page:
                    page_start = self.all_page - self.page_count + 1
                    page_end = self.all_page + 1
                else:
                    page_start = self.current_page - self.page_count_half
                    page_end = self.current_page + self.page_count_half + 1
        page_html_list = []

        first_page = '<li><a href ="%s?page=%s">首页</a></li>' % (self.base_url, 1)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
        else:
            prev_page = '<li><a href="%s?page=%s">上一页</a></li>' % (self.base_url, self.current_page - 1,)

        page_html_list.append(prev_page)

        for i in range(page_start, page_end):
            if i == self.current_page:
                temp = '<li class="active"><a href="%s?page=%s">%s</a></li>' % (self.base_url, i, i,)
            else:
                temp = '<li><a href="%s?page=%s">%s</a></li>' % (self.base_url, i, i,)
            page_html_list.append(temp)

        if self.current_page >= self.all_page:
            next_page = '<li class="disabled"><a href="#">下一页</a></li>'
        else:
            next_page = '<li><a href="%s?page=%s">下一页</a></li>' % (self.base_url, self.current_page + 1,)
        page_html_list.append(next_page)

        last_page = '<li><a href="%s?page=%s">尾页</a></li>' % (self.base_url, self.all_page,)
        page_html_list.append(last_page)

        return ''.join(page_html_list)

使用案例：

 def index1(request):

     book_list = Book.objects.all()

     current_page = request.GET.get('page',)

     obj = Pagination(current_page,len(book_list),request.path)

     page_book_list = book_list[obj.start:obj.end]

     print(page_book_list)

     page_html = obj.page_html()

     return render(request,'book_list1.html',locals())

 <!DOCTYPE html>

 <html lang="zh_CN">

 <head>

     <meta charset="UTF-8">

     <meta http-equiv="x-ua-compatible" content="IE=edge">

     <meta name="viewport" content="width=device-width, initial-scale=1">

     <title>Title</title>

     <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">

 </head>

 <body>

 <ul>

     {% for book in page_book_list %}

         <li>名称：{{ book.title }}----价格：{{ book.price }}</li>

         <br>

     {% endfor %}

 </ul>

 <nav aria-label="Page navigation">

     <ul class="pagination">

         {{ page_html|safe }}

     </ul>

 </nav>

 </body>

 </html>

巴特西

013---Django的分页器

分页

Django的分页器（paginator）

view

扩展

自定义分页器

最新文章

热门文章