mage-ajaxSubmit.js

// Uses this script: https://limonte.github.io/sweetalert2/
var footernewsletterSubscriberFormDetail = new VarienForm("footer-newsletter-validate-detail"),
    val_form = new VarienForm("footer-newsletter-validate-detail");
jQuery("#footer-newsletter-validate-detail").submit(function(e) {
    if (val_form.validator && val_form.validator.validate()) {
        var t = jQuery(this).serializeArray(),
            o = jQuery(this).attr("action"),
            r = swal({
                title: "One moment please...",
                showCancelButton: !0,
                confirmButtonText: "Submit"
            });
        swal.enableLoading();
        jQuery.ajax({
            url: o,
            type: "POST",
            data: t,
            onLoading: r,
            success: function(e, t, o) {
                swal.close(), swal({
                    title: "Cool it worked.",
                    text: t,
                    type: "success",
                    confirmButtonColor: "#DD6B55",
                    confirmButtonText: "Close",
                    closeOnConfirm: !1
                })
            },
            error: function(e, t, o) {
                swal({
                    title: "Uh oh. ",
                    text: "It looks like there was a problem with your submission. Please try again later",
                    type: "error",
                    confirmButtonColor: "#DD6B55",
                    confirmButtonText: "Close",
                    closeOnConfirm: !1
                })
            }
        }), this.reset(), e.preventDefault()
    }
});

Note to self:
this is the original script
<script type="text/javascript"> //<![CDATA[ var footernewsletterSubscriberFormDetail = new VarienForm('footer-newsletter-validate-detail'); var val_form = new VarienForm('footer-newsletter-validate-detail'); jQuery("#footer-newsletter-validate-detail").submit(function(e) { if (val_form.validator && val_form.validator.validate()) { var postData = jQuery(this).serializeArray(); var formURL = jQuery(this).attr("action"); jQuery.ajax( { url : formURL, type: "POST", data : postData, success:function(data, textStatus, jqXHR) { alert('success'); }, error: function(jqXHR, textStatus, errorThrown) { alert('Failure'); } }); this.reset(); //form field reset e.preventDefault(); //STOP default action e.unbind(); //unbind. to stop multiple form submit. } }); //]]> </script>