django 基于yield可迭代对象实现CheckFilter组合搜索组件

class CheckFilter(object):
    def __init__(self, name, data_list, request):
        """

        :param name: 字段名称
        :param data_list: 数据库数据 (('k': 'v'), ('k': 'v')) 类型 
        :param request: request参数
        """
        self.name = name
        self.data_list = data_list
        self.request = request

    def __iter__(self):
        for item in self.data_list:
            key = str(item[0])
            text = item[1]
            ck = ''
            # 如果name在当前用户请求的URL中
            value_list = self.request.GET.getlist(self.name)
            if key in value_list:
                ck = 'checked'
                value_list.remove(key)
            else:
                value_list.append(key)

            # 为自己生成URL
            # 在当前URL参数的基础上再增加一项
            query_dict = self.request.GET.copy()
            query_dict._mutable = True
            query_dict.setlist(self.name, value_list)
            if 'page' in query_dict:
                query_dict.pop('page')
            param_url = query_dict.urlencode()
            if param_url:
                url = '{}?{}'.format(self.request.path_info, param_url)
            else:
                url = self.request.path_info

            tpl = "<a class='cell' href='{url}'><input type='checkbox' {ck} /><label>{text}</label></a>"
            html = tpl.format(url=url, ck=ck, text=text)
            yield mark_safe(html)

function bindClickCheckFilter() {
	$('.filter-area').find(':checkbox').click(function () {
		location.href = $(this).parent().attr('href');
	});
}