Validator for input type file in Parsley 2.x

gistfile1.txt

    window.Parsley
    .addValidator('filemaxsize',  {
        requirementType: 'string',
        validateString: function (val, req){
            var reqs = req.split('|');
            var input = $('input[type="file"][name="'+reqs[0]+'"]');
            console.log(reqs[0], reqs[1]);
            var maxsize = reqs[1];
            var max_bytes = maxsize * 1000000, file = input.prop('files')[0];
            return file.size <= max_bytes;
        },
        messages: {
            en: 'The file is too big'
        }
    });