"""

自定义分页组件

"""

class Pagination(object):

    def __init__(self, current_page, all_count, base_url, params, per_page_num=8, pager_count=11, ):

        """

        封装分页相关数据

        :param current_page: 当前页

        :param all_count:    数据库中的数据总条数

        :param base_url: 分页中显示的URL前缀

        :param params:  request.get 对象

        :param per_page_num: 每页显示的数据条数

        :param pager_count:  最多显示的页码个数

        """

        try:

            current_page = int(current_page)

        except Exception as e:

            current_page = 1

        if current_page < 1:

            current_page = 1

        self.current_page = current_page

        self.all_count = all_count

        self.per_page_num = per_page_num

        self.base_url = base_url

        all_pager, tmp = divmod(all_count, per_page_num)

        if tmp:

            all_pager += 1

        self.all_pager = all_pager

        self.pager_count = pager_count

        self.pager_count_half = int((pager_count - 1) / 2)

        import copy

        params = copy.deepcopy(params)

        params._mutable = True

        self.params = params  # self.params : {"page":77,"title":"python","nid":1}

    @property

    def start(self):

        return (self.current_page - 1) * self.per_page_num

    @property

    def end(self):

        return self.current_page * self.per_page_num

    def page_html(self):

        # 如果总页码 < 11个：

        if self.all_pager <= self.pager_count:

            pager_start = 1

            pager_end = self.all_pager + 1

        # 总页码  > 11

        else:

            # 当前页如果<=页面上最多显示(11-1)/2个页码

            if self.current_page <= self.pager_count_half:

                pager_start = 1

                pager_end = self.pager_count + 1

            # 当前页大于5

            else:

                # 页码翻到最后

                if (self.current_page + self.pager_count_half) > self.all_pager:

                    pager_start = self.all_pager - self.pager_count + 1

                    pager_end = self.all_pager + 1

                else:

                    pager_start = self.current_page - self.pager_count_half

                    pager_end = self.current_page + self.pager_count_half + 1

        page_html_list = []

        self.params["page"] = 1

        first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(first_page)

        if self.current_page <= 1:

            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'

        else:

            self.params["page"] = self.current_page - 1

            prev_page = '<li><a href="%s?%s">上一页</a></li>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(prev_page)

        for i in range(pager_start, pager_end):

            self.params["page"] = i

            if i == self.current_page:

                temp = '<li class="active"><a href="%s?%s">%s</a></li>' % (self.base_url, self.params.urlencode(), i,)

            else:

                temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url, self.params.urlencode(), i,)

            page_html_list.append(temp)

        if self.current_page >= self.all_pager:

            next_page = '<li class="disabled"><a href="#">下一页</a></li>'

        else:

            self.params["page"] = self.current_page + 1

            next_page = '<li><a href="%s?%s">下一页</a></li>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(next_page)

        self.params["page"] = self.all_pager

        last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(last_page)

        return ''.join(page_html_list)

from django.shortcuts import render,HttpResponse

# Create your views here.

from .models import *

def index(request):

    '''

    book_list=[]

    for  i in range(500):

        book_obj=Book(title="book_%s"%i,price=i*i)

        book_list.append(book_obj)

    Book.objects.bulk_create(book_list)

    '''

    current_page = request.GET.get("page", 1)

    all_count = Book.objects.all().count()

    base_url = request.path  # /index/

    from app01.utils.page import Pagination

    pagination = Pagination(int(current_page),all_count,base_url,request.GET, per_page_num=8, pager_count=11,)

    # def __init__(self, current_page, all_count, base_url, params, per_page_num=8, pager_count=11, ):

    book_list = Book.objects.all()[pagination.start:pagination.end]

    from django.http.request import QueryDict

    # dic = QueryDict(mutable=True)

    # dic["info"] = 123

    # print(type(request.GET))

    # request.GET["info"]=123

    import copy

    params = copy.deepcopy(request.GET)

    params["xxx"] = 123

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

<!DOCTYPE html>

<html lang="zh-CN">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

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

    <!-- 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 foo in book_list %}

        <li>{{ foo }}</li>

    {% endfor %}

</ul>

<nav>

    <ul class="pagination">

        {{ pagination.page_html|safe }}

    </ul>

</nav>

</body>

</html>