python web框架中使用原生分页

转载 wxp_2001 2019/9/7 23:17:12

 

原生分页器 示例   

#!/usr/bin/env python
# -*- coding:utf-8 -*-


class Pagination:

    def __init__(self, p, all_count, pre=10, max_show=11):
        '''

                :param p:    当前页码
                :param all_count:  数据总条数
                :param pre:  每页数据量
                :param max_show: 最多页码数
                '''
        try:
            self.p = int(p)  # 传进来的页码
            if self.p <= 0:
                self.p = 1
        except Exception as e:
            self.p = 1

        # 总量
        # all_count = all_count
        # pre = per  # 每页数据条数
        total_num, more = divmod(all_count, pre)
        if more:
            total_num += 1  # total_num总数据页数

        # 显示页码数
        max_show = max_show
        if total_num <= max_show:  # 总数据量很小
            page_start = 1
            page_end = total_num
        else:
            if self.p - max_show // 2 <= 0:  # 防止左边出现0页
                page_start = 1
                page_end = max_show

            elif self.p + max_show // 2 >= total_num + 1:  # 防止右边出现超出
                page_end = total_num
                page_start = page_end - max_show
            else:
                page_start = self.p - max_show // 2
                page_end = self.p + max_show // 2

        # 数据的起始结束
        self.start = (self.p - 1) * pre
        self.end = self.p * pre

        # 页码
        self.page_start = page_start
        self.page_end = page_end
        self.total_num = total_num

    @property
    def page_html(self):
        li_list = []
        for i in range(self.page_start, self.page_end + 1):
            if i == self.p:
                li_list.append('<li class="active"><a href="?p={}">{}</a></li>'.format(i, i))
            else:
                li_list.append('<li><a href="?p={}">{}</a></li>'.format(i, i))

        # 添加页首 页尾

        li_list.insert(0,
                       '<li><a href="?p={}" aria-label="Previous"><span aria-hidden="true">«</span></a></li>'.format(
                           self.p - 1))
        li_list.append(
            '<li><a href="?p={}" aria-label="Next"><span aria-hidden="true">»</span> </a></li>'.format(self.p + 1))

        if self.p == 1:
            li_list[0] = '<li class="disabled"><span aria-hidden="true">«</span></li>'
        elif self.p == self.total_num:
            li_list[-1] = '<li class="disabled"><span aria-hidden="true">»</span></li>'

        pagehtml = ''.join(li_list)
        return pagehtml

 

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