Python - Django - 封装分页成通用的模块

新建 utils 文件夹，并创建 page.py

page.py：

class ShowPage(object):

    def __init__(self, page_num, total_count, url_prefix, per_page=10, max_page=11):

        '''

        :param page_num: 当前页码数

        :param total_count: 数据总数

        :param url_prefix: a 标签 href 的前缀

        :param per_page: 每页展示的数据数

        :param max_page: 页面上最多显示的页码数

        '''

        self.url_prefix = url_prefix

        self.max_page = max_page

        # 总共需要多少页码来显示

        total_page, m = divmod(total_count, per_page)

        # 如果还有数据

        if m:

            total_page += 1

        self.total_page = total_page

        try:

            page_num = int(page_num)

            # 如果输入的页码数超过了最大的页码数，默认返回最后一页

            if page_num > self.total_page:

                page_num = self.total_page

            # 如果输入的页码数小于 1，则返回第一页

            if page_num < 1:

                page_num = 1

        except Exception as e:

            # 当输入的页码不是正经数字的时候 默认返回第一页的数据

            page_num = 1

        self.page_num = page_num

        # 定义两个变量保存数据从哪儿取到哪儿

        self.data_start = (self.page_num - 1) * 10

        self.data_end = self.page_num * 10

        # 页面上总共展示多少页码

        if self.total_page < self.max_page:

            self.max_page = self.total_page

        half_max_page = self.max_page // 2

        # 页面上展示的页码的开始页

        page_start = self.page_num - half_max_page

        # 页面上展示的页码的结束页

        page_end = self.page_num + half_max_page

        # 如果当前页减一半比 1 还小

        if page_start <= 1:

            page_start = 1

            page_end = self.max_page

        # 如果当前页加一半比总页码还大

        if page_end >= self.total_page:

            page_end = self.total_page

            page_start = self.total_page - self.max_page + 1

        self.page_start = page_start

        self.page_end = page_end

    @property

    def start(self):

        return self.data_start

    @property

    def end(self):

        return self.data_end

    def page_html(self):

        # 拼接 html 的分页代码

        html_list = []

        # 添加首页按钮

        html_list.append('<li><a href="{}?page=1">首页</a></li>'.format( self.url_prefix))

        # 如果是第一页，就没有上一页

        if self.page_num <= 1:

            html_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">«</span></a></li>'.format(self.page_num - 1))

        else:

            # 加一个上一页的标签

            html_list.append('<li><a href="{}?page={}"><span aria-hidden="true">«</span></a></li>'.format(self.url_prefix, self.page_num-1))

        # 展示的页码

        for i in range(self.page_start, self.page_end + 1):

            # 给当前页添加 active

            if i == self.page_num:

                tmp = '<li class="active"><a href="{0}?page={1}">{1}</a></li>'.format(self.url_prefix, i)

            else:

                tmp = '<li><a href="{0}?page={1}">{1}</a></li>'.format(self.url_prefix, i)

            html_list.append(tmp)

        # 如果是最后一页，就没有下一页

        if self.page_num >= self.total_page:

            html_list.append('<li class="disabled"><a href="#"><span aria-hidden="true">»</span></a></li>')

        else:

            html_list.append(

                '<li><a href="{}?page={}"><span aria-hidden="true">»</span></a></li>'.format(self.url_prefix, self.page_num + 1))

        # 添加尾页按钮

        html_list.append('<li><a href="{}?page={}">尾页</a></li>'.format(self.url_prefix, self.total_page))

        page_html = "".join(html_list)  # 拼接 html 的分页代码

        return page_html

views.py：

from django.shortcuts import render

from app01 import models

def book_list(request):

    # 从URL取参数

    page_num = request.GET.get("page")

    print(page_num, type(page_num))

    # 书籍总数

    total_count = models.Book.objects.all().count()

    # 导入显示页码的函数

    from utils.page import ShowPage

    page_obj = ShowPage(page_num, total_count, per_page=10, url_prefix="/book_list/", max_page=11, )

    ret = models.Book.objects.all()[page_obj.start:page_obj.end]

    print(ret)

    page_html = page_obj.page_html()

    return render(request, "book_list.html", {"books": ret, "page_html": page_html})

book_list.html：

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>书籍列表</title>

    <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">

</head>

<body>

<div class="container">

    <table class="table table-bordered">

        <thead>

        <tr>

            <th>序号</th>

            <th>id</th>

            <th>书名</th>

        </tr>

        </thead>

        <tbody>

        {% for book in books %}

            <tr>

                <td>{{ forloop.counter }}</td>

                <td>{{ book.id }}</td>

                <td>{{ book.title }}</td>

            </tr>

        {% endfor %}

        </tbody>

    </table>

    <nav aria-label="Page navigation">

        <ul class="pagination">

            <li>

                {{ page_html|safe }}

            </li>

        </ul>

    </nav>

</div>

</body>

</html>

巴特西

Python - Django - 封装分页成通用的模块

最新文章

热门文章