(function ($) {
    if($.validator && $.validator.unobtrusive){
        $.validator.unobtrusive.options = {
            errorClass: 'is-invalid',
            validClass: 'is-valid',
            errorElement: 'span',
            errorPlacement: function (error, element) {
                error.addClass('invalid-feedback');

                var valmsgFor = element[0].id;
                if (element[0].type === 'radio') {
                    valmsgFor = element[0].name.replace(/\..*/g, "");
                }

                var errElement = 
                    $('[data-valmsg-for="' + valmsgFor + '"]');

                errElement.after(error);
            }  
        };
    }
    else {
        console.warn('$.validator is not defined. Please load this library **after** loading jquery.validate.js and jquery.validate.unobtrusive.js');
    }
})(jQuery);