UI: Add notification popover loadings state

ui-ngx/src/app/modules/home/components/notification/show-notification-popover.component.html

@@ -24,6 +24,7 @@
   </button>
 </section>
 <mat-divider></mat-divider>
+<ng-container *ngIf="loadNotification; else loadingNotification">
   <div *ngIf="(notifications$ | async).length; else emptyNotification" style="overflow: auto">
     <section style="min-height: 100px; overflow: auto; padding: 6px 0;">
       <div *ngFor="let notification of (notifications$ | async); let last = last; trackBy: trackById">
@@ -41,7 +42,14 @@
       {{ 'notification.view-all' | translate }}
     </button>
   </section>
+</ng-container>
 <ng-template #emptyNotification>
   <img src="assets/notification-bell.svg" alt="empty notification" style="margin: 20px 24%">
   <span style="text-align: center; margin-bottom: 12px" translate>notification.no-notifications-yet</span>
 </ng-template>
+<ng-template #loadingNotification>
+  <div class="tb-no-data-available" style="margin: 20px; gap: 16px;">
+    <mat-spinner color="accent" diameter="65" strokeWidth="4"></mat-spinner>
+    <div class="tb-no-data-text" translate>notification.loading-notifications</div>
+  </div>
+</ng-template>

ui-ngx/src/app/modules/home/components/notification/show-notification-popover.component.ts

@@ -22,7 +22,7 @@ import { AppState } from '@core/core.state';
 import { Notification, NotificationRequest } from '@shared/models/notification.models';
 import { NotificationWebsocketService } from '@core/ws/notification-websocket.service';
 import { BehaviorSubject, Observable, ReplaySubject, Subscription } from 'rxjs';
-import { share, tap } from 'rxjs/operators';
+import { map, share, tap } from 'rxjs/operators';
 import { Router } from '@angular/router';
 import { NotificationSubscriber } from '@shared/models/websocket/notification-ws.models';
 
@@ -46,6 +46,7 @@ export class ShowNotificationPopoverComponent extends PageComponent implements O
   private notificationCountSubscriber: Subscription;
 
   notifications$: Observable<Notification[]>;
+  loadNotification = false;
 
   constructor(protected store: Store<AppState>,
               private notificationWsService: NotificationWebsocketService,
@@ -58,6 +59,13 @@ export class ShowNotificationPopoverComponent extends PageComponent implements O
   ngOnInit() {
     this.notificationSubscriber = NotificationSubscriber.createNotificationsSubscription(this.notificationWsService, this.zone, 6);
     this.notifications$ = this.notificationSubscriber.notifications$.pipe(
+      map(value => {
+        if (Array.isArray(value)) {
+          this.loadNotification = true;
+          return value;
+        }
+        return [];
+      }),
       share({
         connector: () => new ReplaySubject(1)
       }),

ui-ngx/src/app/shared/models/websocket/notification-ws.models.ts

@@ -52,7 +52,7 @@ export class NotificationSubscriber extends WsSubscriber {
     cmdUpdateType: undefined,
     errorCode: 0,
     errorMsg: '',
-    notifications: [],
+    notifications: null,
     totalUnreadCount: 0
   });
 

ui-ngx/src/assets/locale/locale.constant-en_US.json

@@ -3201,6 +3201,7 @@
             "dashboard": "Open dashboard",
             "link": "Open URL link"
         },
+        "loading-notifications": "Loading notifications...",
         "management": "Notification management",
         "mark-all-as-read": "Mark all as read",
         "mark-as-read": "Mark as read",