[Blazor] Avoid calling dispatchGlobalEventToAllElements when no renderer attached (#58667)

* Prevents an issue where the event tries to get dispatched when no renderer is attached.

---------

Co-authored-by: Javier Calvarro Nelson <[email protected]>

Author: 2 people

src/Components/Web.JS/src/Rendering/Events/EventDelegator.ts

@@ -3,7 +3,7 @@
 
 import { EventFieldInfo } from './EventFieldInfo';
 import { eventNameAliasRegisteredCallbacks, getBrowserEventName, getEventNameAliases, getEventTypeOptions } from './EventTypes';
-import { dispatchEvent } from '../WebRendererInteropMethods';
+import { isRendererAttached, dispatchEvent } from '../WebRendererInteropMethods';
 
 const nonBubblingEvents = toLookup([
   'abort',
@@ -136,6 +136,11 @@ export class EventDelegator {
       return;
     }
 
+    if (!isRendererAttached(this.browserRendererId)) {
+      // when connection closed, it will detachWebRendererInterop, so we need to check if the renderer is still attached
+      return;
+    }
+
     // Always dispatch to any listeners for the original underlying browser event name
     this.dispatchGlobalEventToAllElements(evt.type, evt);