first commit

media/com_config/js/modules-default.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
+ */
+((document, submitForm) => {
+
+  // Selectors used by this script
+  const buttonDataSelector = 'data-submit-task';
+
+  /**
+   * Submit the task
+   * @param task
+   * @param form
+   */
+  const submitTask = (task, form) => {
+    if (task === 'modules.cancel' || document.formvalidator.isValid(form)) {
+      submitForm(task, form);
+    }
+  };
+
+  /**
+   * Register events
+   */
+  const registerEvents = () => {
+    const buttons = [].slice.call(document.querySelectorAll(`[${buttonDataSelector}]`));
+    buttons.forEach(button => {
+      button.addEventListener('click', e => {
+        e.preventDefault();
+        const task = e.currentTarget.getAttribute(buttonDataSelector);
+        submitTask(task, e.currentTarget.form);
+      });
+    });
+  };
+  document.addEventListener('DOMContentLoaded', () => {
+    registerEvents();
+  });
+})(document, Joomla.submitform);