Marketo Email Domain Validation (Blocklist)

marketo-block-email-domains.js

/*
 * @author Sanford Whiteman
 * @version v1.0 2020-10-22
 * @copyright © 2020 Sanford Whiteman
 * @license Hippocratic 2.1: This license must appear with all reproductions of this software.
 * @https://nation.marketo.com/t5/product-discussions/how-do-i-get-a-form-to-display-an-error-message-in-real-time/td-p/306036
 *
 *
 */
(function () {
   // Please include the email domains you would like to block in this list
   var invalidDomains = [
      "@gmail.",
      "@yahoo.",
      "@hotmail.",
      "@live.",
      "@aol.",
      "@outlook."
   ];
   var interestingEmailField = "Email";

   MktoForms2.whenReady(function (mktoForm) {
      let formEl = mktoForm.getFormElem()[0],
         emailEl = formEl.querySelector("[name='" + interestingEmailField + "']");

      mktoForm.onValidate(extendedEmailValidation);
      emailEl.addEventListener("blur", extendedEmailValidation);

      function extendedEmailValidation(nativeValid) {
         if (nativeValid === false) return;

         let currentValues = mktoForm.getValues(),
            email = currentValues[interestingEmailField];

         if (email) {
            if (isInvalidDomain(email)) {
               emailEl.classList.add("customInvalid");
               emailEl.setAttribute("aria-invalid","true");
               mktoForm.submittable(false);
               mktoForm.showErrorMessage("Must be Business email.", MktoForms2.$(emailEl) );
            } else {
               emailEl.classList.remove("customInvalid");
               emailEl.setAttribute("aria-invalid","false");
               mktoForm.submittable(true);
            }
         }
      }

      function isInvalidDomain(email) {
         return invalidDomains.some(function(domainPrefix){
            return new RegExp(domainPrefix.replace(".","[.]")+"[a-z.-]+$","i").test(email);
         });
      }
      
   });
})();