primo commit

media/com_guidedtours/joomla.asset.json

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+{
+  "$schema": "https://developer.joomla.org/schemas/json-schema/web_assets.json",
+  "name": "com_guidedtours",
+  "version": "4.0.0",
+  "description": "Joomla CMS",
+  "license": "GPL-2.0-or-later",
+  "assets": [
+    {
+      "name": "com_guidedtours.tour-edit",
+      "type": "script",
+      "uri": "com_guidedtours/tour-edit.min.js",
+      "dependencies": [
+        "core"
+      ],
+      "attributes": {
+        "type": "module",
+        "defer": true
+      },
+      "version": "318150"
+    }
+  ]
+}

media/com_guidedtours/js/tour-edit.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
+ */
+
+(() => {
+
+  // before 'joomla:showon-processed' is implemented in Showon we must use more frequent 'joomla:showon-show' and'joomla:showon-hide' events
+  ['joomla:showon-show', 'joomla:showon-hide'].forEach(eventType => {
+    document.addEventListener(eventType, () => {
+      document.querySelectorAll('#guidedtour-dates-form fieldset').forEach(fieldset => {
+        // Only hide fieldsets containing field control-group i.e. not radio selectors etc. that may use fieldsets
+        if (fieldset.querySelectorAll(':scope .control-group').length === 0) {
+          return;
+        }
+        const visibleChildren = fieldset.querySelectorAll(':scope .control-group:not(.hidden)');
+        if (visibleChildren.length) {
+          fieldset.classList.remove('hidden');
+        } else {
+          fieldset.classList.add('hidden');
+        }
+      });
+      document.querySelectorAll('#guidedtour-dates-form joomla-tab-element').forEach(tabelement => {
+        const tabLabel = document.querySelector(`button[aria-controls="${tabelement.id}"]`);
+        if (tabLabel) {
+          const visibleChildren = tabelement.querySelectorAll(':scope .control-group:not(.hidden)');
+          if (visibleChildren.length) {
+            tabLabel.removeAttribute('hidden');
+          } else {
+            tabLabel.setAttribute('hidden', 'hidden');
+          }
+        }
+      });
+    });
+  });
+})();

media/com_guidedtours/js/tour-edit.min.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:showon-show","joomla:showon-hide"].forEach(t=>{document.addEventListener(t,()=>{document.querySelectorAll("#guidedtour-dates-form fieldset").forEach(e=>{if(e.querySelectorAll(":scope .control-group").length===0)return;e.querySelectorAll(":scope .control-group:not(.hidden)").length?e.classList.remove("hidden"):e.classList.add("hidden")}),document.querySelectorAll("#guidedtour-dates-form joomla-tab-element").forEach(e=>{const o=document.querySelector(`button[aria-controls="${e.id}"]`);o&&(e.querySelectorAll(":scope .control-group:not(.hidden)").length?o.removeAttribute("hidden"):o.setAttribute("hidden","hidden"))})})});