django 分页实用

1、分页器

class Pagination(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
        # 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:
            # 将取出的page转换为int类型
            page_num = int(page_num)
        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
        # 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
        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) * per_page
        self.data_end = page_num * per_page

        # 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, 不然页面上会显示负数的页码
        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， 不然页面上会显示比总页码还大的多余页码
        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 = []
        # # 加上首页
        html_str_list.append('<li><a href="{}?page=1">首页</a></li>'.format(self.url_prefix))
        # 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>')
        else:
            # 不是第一页，就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)

        # 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:
            # 不是最后一页， 就加一个下一页标签
            html_str_list.append('<li><a href="{}?page={}"><span aria-hidden="true">&raquo;</span></a></li>'.format(self.url_prefix, self.page_num + 1))

        # 加上尾页
        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

    def page_conditions_html(self, search_content):
        # 自己拼接分页的HTML代码
        html_str_list = []
        # # 加上首页
        html_str_list.append('<li><a href="{}?page=1&search_content={}">首页</a></li>'.format(self.url_prefix, search_content))
        # 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>')
        else:
            # 不是第一页，就加一个上一页的标签
            html_str_list.append(
                '<li><a href="{}?page={}&search_content={}"><span aria-hidden="true">&laquo;</span></a></li>'.format(
                    self.url_prefix, self.page_num - 1, search_content
                ))

        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}&search_content={2}">{1}</a></li>'.format(
                    self.url_prefix, i, search_content
                )
            else:
                tmp = '<li><a href="{0}?page={1}&search_content={2}">{1}</a></li>'.format(
                    self.url_prefix, i, search_content
                )

            html_str_list.append(tmp)

        # 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:
            # 不是最后一页， 就加一个下一页标签
            html_str_list.append(
                '<li><a href="{}?page={}&search_content={}"><span aria-hidden="true">&raquo;</span></a></li>'.format(
                    self.url_prefix, self.page_num + 1, search_content
                ))

        # 加上尾页
        html_str_list.append('<li><a href="{}?page={}&search_content={}">尾页</a></li>'.format(
            self.url_prefix, self.total_page, search_content
        ))

        page_html = "".join(html_str_list)
        return page_html

2、视图

def show_supplier(request):

    current_page = int(request.GET.get('page'))
    total_count = TpAcgPhone.objects.using('dev').count()
    page_obj = Pagination(current_page, total_count, request.path_info)
    contact_lst = TpAcgPhone.objects.using('dev').all()[page_obj.start:page_obj.end]
    page_html = page_obj.page_html()
    return render(request, "show_supplier.html", {"contact_lst": contact_lst, "page_html": page_html})

好难受