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media/com_users/js/admin-users-groups.js

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+/**
+ * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+Joomla = window.Joomla || {};
+(Joomla => {
+
+  document.addEventListener('DOMContentLoaded', () => {
+    Joomla.submitbutton = task => {
+      if (task === 'groups.delete') {
+        const cids = document.getElementsByName('cid[]');
+        for (let i = 0; i < cids.length; i += 1) {
+          if (cids[i].checked && cids[i].parentNode.getAttribute('data-usercount') !== '0') {
+            // @todo replace with joomla-alert
+            if (window.confirm(Joomla.Text._('COM_USERS_GROUPS_CONFIRM_DELETE'))) {
+              Joomla.submitform(task);
+            }
+            return false;
+          }
+        }
+      }
+      Joomla.submitform(task);
+      return false;
+    };
+  });
+})(Joomla);