fix(interactive-fieldset): small fix

frontend/src/lib/event-manager/event-manager.js

@@ -8,7 +8,7 @@ export const EVENT_TYPE = {
     SUBMIT : 'submit',
     INPUT : 'input',
     FOCUS_OUT : 'focusout',
-    //more to be added
+    BEFOREUNLOAD : 'beforeunload',
 };
 
 
@@ -47,6 +47,12 @@ export class EventManager {
 
     removeAllObserversFromUtil() {
         this._mutationObservers.forEach((observer) => observer.disconnect());
+        this.mutationObservers = [];
+    }
+
+    cleanUp() {
+        this.removeAllObserversFromUtil();
+        this.removeAllEventListenersFromUtil();
     }
 
 

frontend/src/utils/form/interactive-fieldset.js

@@ -31,7 +31,7 @@ export class InteractiveFieldset {
 
     this._element = element;
 
-    this._eventManger = new EventManager();
+    this._eventManager = new EventManager();
 
     if (this._element.classList.contains(INTERACTIVE_FIELDSET_INITIALIZED_CLASS)) {
       return false;