Django的分页器

一个分页器的模板

import copy


class Pagination(object):

    def __init__(self, current_page_num, all_count, request, per_page_num, page_count=11):
        '''

        :param current_page_num:当前访问页的数字
        :param all_count:分页数据中的数据总条数
        :param request:
        :param per_page_num:每页显示的数据条数
        :param page_count:最多显示的页码个数
        '''

        try:
            current_page_num = int(current_page_num)
        except Exception as e:
            current_page_num = 1

        if current_page_num < 1:
            current_page_num = 1

        self.current_page_num = current_page_num
        self.all_count = all_count
        self.per_page_num = per_page_num
        self.page_count = page_count

        # 实际总页码,每页显示的数据条数
        all_page, tmp = divmod(all_count, per_page_num)
        if tmp:
            all_page += 1
        self.all_page = all_page
        self.page_count = page_count
        self.page_count_half = int((page_count - 1) / 2)

        # 保存搜索条件
        self.params = copy.deepcopy(request.GET)

    @property
    def start(self):
        return (self.current_page_num - 1) * self.per_page_num

    @property
    def end(self):
        return self.current_page_num * self.per_page_num

    def page_html(self):
        # 如果总页码<11个
        if self.all_page <= self.page_count:
            page_start = 1
            page_end = self.all_page + 1
        # 如果总页码>11
        else:
            # 如果当前页<5
            if self.current_page_num <= self.page_count_half:
                page_start = 1
                page_end = self.page_count + 1
            # 如果当前页>5
            else:
                # 页码翻到最后
                # 如果当前页+5>总页数
                if (self.current_page_num + self.page_count_half) > self.all_page:
                    page_start = self.all_page - self.page_count + 1
                    page_end = self.all_page + 1
                # (10,21)

                else:
                    page_start = self.current_page_num - self.page_count_half
                    page_end = self.current_page_num + self.page_count_half + 1

        page_html_list = []
        first_page = '<li><a href="?page=%s">首页</a></li>' % 1
        page_html_list.append(first_page)

        if self.current_page_num <= 1:
            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
        else:
            prev_page = '<li><a href="?page=%s">上一页</a></li>' % (self.current_page_num - 1)

        page_html_list.append(prev_page)

        for i in range(page_start, page_end):
            self.params["page"] = i

            if i == self.current_page_num:
                temp = '<li class="active"><a href="?%s">%s</a></li>' % (self.params.urlencode(), i)
            else:
                temp = '<li><a href="?%s">%s</a></li>' % (self.params.urlencode(), i)
            page_html_list.append(temp)

        if self.current_page_num >= self.all_page:
            next_page = '<li class="disabled"><a href="#">下一页</a></li>'
        else:
            next_page = '<li><a href="?page=%s">下一页</a></li>' % (self.current_page_num + 1)

        page_html_list.append(next_page)
        last_page = '<li><a href="?page=%s">尾页</a></li>' % self.all_page
        page_html_list.append(last_page)

        return "".join(page_html_list)

在视图函数中调用分页器(部分代码):

from page import Pagination

def index(request):
    current_page_num = request.GET.get("page")    #获取第几页
    all_count = data_list.count()    #获取所有数据
    per_page_num = 10    #每页显示10条数据
    pagination = Pagination(current_page_num, all_count, request, per_page_num) 
    data_list = data_list[pagination.start:pagination.end]
    return render(request,"data.html", {"data_list":data_list})