can i resubmit the post to another page after ajax request

I have a form that I want to validate on both sides script and php. So I thought I can do an ajax request to a page to validate. After that if the validation is successful I want to go to the original page (the action of the form).

Is that possible?

I tried this code but its not working properly. Can someone help please?

$(document).ready(function () {
    $('#checkout_form').on('submit', function (e) {
        e.preventDefault();
        var link = "{#$config.base_url_https}/function_ajax.php";

        $.ajax({
            url: link,
            type: "POST",
            data: $(this).serialize() + "&function_name=validate_checkout",
            success: function (html) {
                if (html == "false") {
                    location.href = "./login.php";
                } else {
                    document.getElementById('checkout_form').submit();
                }
            },
            error: function (jXHR, textStatus, errorThrown) {
                // alert(errorThrown);
            }
        });
    });
});

if its not possible is there any other way to do this?