first commit

media/layouts/js/joomla/form/field/category-change.js

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+/**
+ * @copyright  (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+(Joomla => {
+  const id = Joomla.getOptions('category-change');
+  const element = document.querySelector(`#${id}`);
+  if (!element) {
+    throw new Error('Category Id element not found');
+  }
+  if (element.getAttribute('data-refresh-catid') && element.value !== element.getAttribute('data-cat-id')) {
+    element.value = element.getAttribute('data-refresh-catid');
+  } else {
+    // No custom fields
+    element.setAttribute('data-refresh-catid', element.value);
+  }
+  window.Joomla.categoryHasChanged = el => {
+    if (el.value === el.getAttribute('data-refresh-catid')) {
+      return;
+    }
+    document.body.appendChild(document.createElement('joomla-core-loader'));
+
+    // Custom Fields
+    if (el.getAttribute('data-refresh-section')) {
+      document.querySelector('input[name=task]').value = `${el.getAttribute('data-refresh-section')}.reload`;
+    }
+    Joomla.submitform(`${el.getAttribute('data-refresh-section')}.reload`, element.form);
+  };
+})(Joomla);

media/layouts/js/joomla/form/field/category-change.min.js

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+(e=>{const t=e.getOptions("category-change"),a=document.querySelector(`#${t}`);if(!a)throw new Error("Category Id element not found");a.getAttribute("data-refresh-catid")&&a.value!==a.getAttribute("data-cat-id")?a.value=a.getAttribute("data-refresh-catid"):a.setAttribute("data-refresh-catid",a.value),window.Joomla.categoryHasChanged=t=>{t.value!==t.getAttribute("data-refresh-catid")&&(document.body.appendChild(document.createElement("joomla-core-loader")),t.getAttribute("data-refresh-section")&&(document.querySelector("input[name=task]").value=`${t.getAttribute("data-refresh-section")}.reload`),e.submitform(`${t.getAttribute("data-refresh-section")}.reload`,a.form))}})(Joomla);