diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 3803d0d..c0591cd 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -139,6 +139,7 @@
         entry: ./site.sh lint-js
         language: system
         files: \.js$
+        exclude: ^sphinx_airflow_theme/
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v2.3.0
     hooks:
diff --git a/sphinx_airflow_theme/sphinx_airflow_theme/__init__.py b/sphinx_airflow_theme/sphinx_airflow_theme/__init__.py
index 8296d2a..3ff400e 100644
--- a/sphinx_airflow_theme/sphinx_airflow_theme/__init__.py
+++ b/sphinx_airflow_theme/sphinx_airflow_theme/__init__.py
@@ -37,5 +37,6 @@
 def setup(app: Sphinx):
     app.add_html_theme('sphinx_airflow_theme', path.abspath(path.dirname(__file__)))
     app.add_css_file('_gen/css/main-custom.min.css')
+    app.add_js_file('js/globaltoc.js')
     app.connect("config-inited", setup_my_func)
     return {"version": "__version__", "parallel_read_safe": True, "parallel_write_safe": True}
diff --git a/sphinx_airflow_theme/sphinx_airflow_theme/static/js/globaltoc.js b/sphinx_airflow_theme/sphinx_airflow_theme/static/js/globaltoc.js
new file mode 100644
index 0000000..716c969
--- /dev/null
+++ b/sphinx_airflow_theme/sphinx_airflow_theme/static/js/globaltoc.js
@@ -0,0 +1,24 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+// The script adds a 'click' eventListener to the 'span.toctree-expand' element that makes the active submenus collapsible.
+// To make the submenus collapsible is sufficient to add/remove the 'current' class to the active 'li.toctree-l1' element.
+$("span.toctree-expand").on("click", function() {
+  $(this).closest("li").toggleClass("current");
+});