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media/com_menus/js/default-batch-body.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 => {
+  const batchMenu = document.getElementById('batch-menu-id');
+  const batchCopyMove = document.getElementById('batch-copy-move');
+  let batchSelector;
+  const onChange = () => {
+    if (batchSelector.value !== 0 || batchSelector.value !== '') {
+      batchCopyMove.classList.remove('hidden');
+    } else {
+      batchCopyMove.classList.add('hidden');
+    }
+  };
+  if (batchMenu) {
+    batchSelector = batchMenu;
+  }
+  if (batchCopyMove) {
+    batchSelector.addEventListener('change', onChange);
+  }
+})(document);