if (((document.getElementById(field_id).files.length) === 0) || (!fileInput.files[0].fileName.match(/\.(jpg|jpeg|png|gif)$/))) {
            error = this.message.replace('{{ field_name }}', String(parse_field_name(field.attr('name'))));
            if (field.attr('data-message') !== '') {
                error = field.attr('data-message');
            }