Django中的分页

方法一：views

def books(request):
    # url取page参数书
    page_num = request.GET.get(‘page‘)
    print(page_num, type(page_num))
    # 总页码数
    total_count = models.Book.objects.all().count()
    # 每页显示多少条数据
    per_page = 10
    # 总共需要多少页码展示
    total_page, m = divmod(total_count, per_page)
    if m:
        total_page += 1

    try:
        page_num = int(page_num)
        if page_num > total_page:
            page_num = total_page
    except Exception as e:
        # 页码不是数字,默认返回第一页
        page_num = 1

    # 定义两个变量保存数据从取到哪儿
    data_start = (page_num - 1) * 10
    data_end = page_num * 10

    # 页面上最多展示多少个页码
    max_page = 11
    if total_page < max_page:
        max_page = total_page

    half_max_page = max_page // 2
    # 页码上展示的页码从哪儿开始
    page_start = page_num - half_max_page
    # 页面展示到哪儿结束
    page_end = page_num + half_max_page
    # 如果当前页面减一半，比1还小
    if page_start <= 1:
        page_start = 1
        page_end = max_page
    # 如果当前页 加 一半 比总页码数还大
    if page_end >= total_page:
        page_end = total_page
        page_start = total_page - max_page

    all_book = models.Book.objects.all()[data_start:data_end]
    # 自己拼接分页的代码
    html_str_list = []
    # 加上第一页(首页)
    html_str_list.append(‘<li><a href="/books/?page=1">首页</a></li>‘)

    # 判断一下，如果是第一页，就没有上一页
    if page_num <= 1:
        html_str_list.append(
            ‘<li class="disabled"><a href="#"> <span aria-hidden="true">&laquo;</span></a></li>‘.format(
                page_num - 1))
    else:
        html_str_list.append(
            ‘<li><a href="/books/?page={}"> <span aria-hidden="true">&laquo;</span></a></li>‘.format(page_num - 1))

    for i in range(page_start, page_end + 1):
        tmp = ‘<li> <a href="/books/?page={0}">{0}</a></li>‘.format(i)
        html_str_list.append(tmp)
    # 加一个下一页的标签(下一页)
    # 判断是否是最后一页
    if page_num >= total_page:
        html_str_list.append(
            ‘<li class="disabled" ><a href="#"> <span aria-hidden="true">&raquo;</span></a></li>‘)
    else:
        html_str_list.append(
            ‘<li><a href="/books/?page={}"> <span aria-hidden="true">&raquo;</span></a></li>‘.format(page_num + 1))

    # 加上最后一页(尾页)
    html_str_list.append(‘<li><a href="/books/?page={}">尾页</a></li>‘.format(total_page))

    page_html = "".join(html_str_list)
    return render(request, "books.html",
                  {‘books‘: all_book, "page_html": page_html})

book.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>

方法二：利用封装

创建文件utils文件

mypage

class Page():

    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: 每页显示多少条数据
        :param max_page: 页面上最多显示几个页码
        """
        self.url_prefix = url_prefix
        self.max_page = max_page
        # 每一页显示多少条数据
        # 总共需要多少页码来展示
        total_page, m = divmod(total_count, per_page)
        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 > total_page:
                page_num = total_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 = (page_num - 1) * 10
        self.data_end = page_num * 10

        # 页面上总共展示多少页码
        if total_page < self.max_page:
            self.max_page = total_page

        half_max_page = self.max_page // 2
        # 页面上展示的页码从哪儿开始
        page_start = page_num - half_max_page
        # 页面上展示的页码到哪儿结束
        page_end = 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 比总页码数还大
        if page_end >= total_page:
            page_end = total_page
            page_start = 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):
        # 自己拼接分页的HTML代码
        html_str_list = []
        # 加上第一页
        html_str_list.append(‘<li><a href="{}?page=1">首页</a></li>‘.format( self.url_prefix))

        # 判断一下 如果是第一页，就没有上一页
        if self.page_num <= 1:
            html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">&laquo;</span></a></li>‘.format(self.page_num-1))
        else:
            # 加一个上一页的标签
            html_str_list.append(‘<li><a href="{}?page={}"><span aria-hidden="true">&laquo;</span></a></li>‘.format( self.url_prefix, self.page_num-1))

        for i in range(self.page_start, self.page_end+1):
            # 如果是当前页就加一个active样式类
            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_str_list.append(tmp)

        # 加一个下一页的按钮
        # 判断，如果是最后一页，就没有下一页
        if self.page_num >= self.total_page:
            html_str_list.append(‘<li class="disabled"><a href="#"><span aria-hidden="true">&raquo;</span></a></li>‘)
        else:
            html_str_list.append(‘<li><a href="{}?page={}"><span aria-hidden="true">&raquo;</span></a></li>‘.format( self.url_prefix, self.page_num+1))
        # 加最后一页
        html_str_list.append(‘<li><a href="{}?page={}">尾页</a></li>‘.format( self.url_prefix, self.total_page))

        page_html = "".join(html_str_list)
        return page_html

封装代码

views

def depts(request):
    page_num = request.GET.get(‘page‘)
    print(page_num, type(page_num))
    # 总页码
    total_count = models.Dept.objects.all().count()
    from utils.mypage import Page
    page_obj = Page(page_num, total_count, per_page=10, url_prefix="/depts/", 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,"dept.html",{‘dept‘:ret,‘page_html‘:page_html})

视图

html代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
     <title>部门列表</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>部门名</th>
            </tr>
          </thead>
            <tbody>
            {% for dept in depts %}
                <tr>
                <td>{{ forloop.counter }}</td>
                <td>{{ dept.id }}</td>
                <td>{{ dept.name }}</td>
                </tr>
            {% endfor %}

            </tbody>
        </table>
        <nav aria-label="Page navigation">
          <ul class="pagination">
                {{ page_html|safe }}
          </ul>
        </nav>
    </div>
</body>

Django中的分页

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