django 分页 带搜索框

from django.utils.safestring import mark_safe

"""
自定义的分页组件

def pretty_list(request):
    from app01.utils.pagination import Pagination
    # 1.根据自己的情况去筛选自己的数据
    queryset = models.PrettyNum.objects.filter(**data_dict).order_by("-level")
    # 2.实例化分页对象
    page_object = Pagination(request, queryset)

    context = {
        "search_data": search_data,

        "queryset": page_object.page_queryset, # 分完页的数据
        "page_string": page_object.html() # 页码
    }

    return render(request, "pretty_list.html", context)
# 在html中
    <ul class="pagination">
        {{ page_string }}
    </ul>
"""


class Pagination(object):
    def __init__(self, request, queryset, page_size=10, page_param="page", plus=5):
        """
        :param request: 请求的对象
        :param queryset: 查询符合条件的数据，根据这个数据对他进行分页处理
        :param page_size: 每页显示多少条数据
        :param page_param: 在url中传递的获取分页的参数 例如： /pretty/list/?page=12
        :param plus: 显示当前页的前后几页（页码）
        """

        from django.http.request import QueryDict
        import copy
        query_dict = copy.deepcopy(request.GET)
        query_dict._mutable = True
        self.query_dict = query_dict
        page = request.GET.get(page_param, "1")
        if page.isdecimal():
            page = int(page)
        else:
            page = 1
        self.page = page
        self.page_param = page_param
        self.page_size = page_size
        self.start = (self.page - 1) * self.page_size
        self.end = self.page * self.page_size
        self.page_queryset = queryset[self.start: self.end]
        self.plus = plus

        # 数据总条数
        total_count = queryset.count()

        # 计算总页码数
        total_page_count, div = divmod(total_count, page_size)  # divmod 除法 第二个是余数
        if div > 1:
            total_page_count += 1

        if total_page_count != 0:
            self.total_page_count = total_page_count
        else:
            self.total_page_count = 1

    def html(self):
        # 计算出当前页的前5页， 后5页
        plus = 5
        if self.total_page_count < 2 * self.plus + 1:
            # 数据库中数据比较少，都没有达到11页
            start_page = 1
            end_page = self.total_page_count
        else:
            # 数据库中数据比较多 > 11页

            # 当前页小于5时（小极值）
            if self.page <= self.plus:
                start_page = 1
                end_page = 2 * self.plus + 1
            else:
                # 当前页大于5
                # 当前页+5 > 总页面
                if (self.page + 5) > self.total_page_count:
                    start_page = self.total_page_count - 2 * self.plus
                    end_page = self.total_page_count
                else:
                    start_page = self.page - self.plus
                    end_page = self.page + self.plus

        # 页码
        page_str_list = []

        self.query_dict.setlist(self.page_param, [1])

        page_str_list.append('<li><a href="?{}">首页</a></li>'.format(self.query_dict.urlencode()))

        # 上一页
        if self.page > 1:
            self.query_dict.setlist(self.page_param, [self.page - 1])
            prey = '<li><a href="?{}">上一页</a></li>'.format(self.query_dict.urlencode())
        else:
            self.query_dict.setlist(self.page_param, [1])
            prey = '<li><a href="?{}">上一页</a></li>'.format(self.query_dict.urlencode())
        page_str_list.append(prey)

        for i in range(start_page, end_page + 1):
            if i == self.page:
                self.query_dict.setlist(self.page_param, [i])
                ele = '<li class="active"><a href="?{}">{}</a></li>'.format(self.query_dict.urlencode(), i)
            else:
                self.query_dict.setlist(self.page_param, [i])
                ele = '<li><a href="?{}">{}</a></li>'.format(self.query_dict.urlencode(), i)
            page_str_list.append(ele)

        # 下一页
        if self.page < self.total_page_count:
            self.query_dict.setlist(self.page_param, [self.page + 1])
            prey = '<li><a href="?{}">下一页</a></li>'.format(self.query_dict.urlencode())
        else:
            self.query_dict.setlist(self.page_param, [self.total_page_count])
            prey = '<li><a href="?{}">下一页</a></li>'.format(self.query_dict.urlencode())
        page_str_list.append(prey)

        # 尾页
        self.query_dict.setlist(self.page_param, [self.total_page_count])
        page_str_list.append('<li><a href="?{}">尾页</a></li>'.format(self.query_dict.urlencode()))

        search_string = """
           <li>
               <form style="float: left; margin-left: -1px" method="get">
                   <input type="text" name='page'  style="position: relative;float: left;display: inline-block;width: 80px;border-radius: 0"
                       class="form-control" placeholder="页码">
                   <button style="border-radius: 0" class="btn btn-default" type="submit">跳转</button>
               </form>
           </li>
           """
        page_str_list.append(search_string)

        page_string = mark_safe("".join(page_str_list))

        return page_string