update

static/js/main.js

@@ -1 +1,15 @@
 
+function getCookie(name) {
+    let cookieValue = null;
+    if (document.cookie && document.cookie !== '') {
+        const cookies = document.cookie.split(';');
+        for (let cookie of cookies) {
+            cookie = cookie.trim();
+            if (cookie.substring(0, name.length + 1) === (name + '=')) {
+                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
+                break;
+            }
+        }
+    }
+    return cookieValue;
+}

templates/base.html

@@ -701,6 +701,7 @@
     <script src="{% static 'js/phoenix.js' %}"></script>
     <script src="{% static 'vendors/echarts/echarts.min.js' %}"></script>
     <script src="{% static 'js/travel-agency-dashboard.js' %}"></script>
+    <script src="{% static 'js/main.js' %}"></script>
     <script src="{% static 'vendors/mapbox-gl/mapbox-gl.js' %}"></script>
     <script src="https://unpkg.com/@turf/turf@6/turf.min.js"></script>
     <script src="{% static 'vendors/swiper/swiper-bundle.min.js' %}"></script>