Try to optimize frontend

1 files changed, 16 insertions, 0 deletions

diff --git a/client/src/app/core/routing/preload-selected-modules-list.ts b/client/src/app/core/routing/preload-selected-modules-list.ts
new file mode 100644
index 000000000..dd5be6ad9
--- /dev/null
+++ b/client/src/app/core/routing/preload-selected-modules-list.ts
@@ -0,0 +1,16 @@
+import { Route, PreloadingStrategy } from '@angular/router';
+import { Observable } from 'rxjs/Observable';
+import 'rxjs/add/observable/timer';
+import 'rxjs/add/operator/switchMap';
+
+export class PreloadSelectedModulesList implements PreloadingStrategy {
+  preload(route: Route, load: Function): Observable<any> {
+    if (!route.data || !route.data.preload) return Observable.of(null);
+
+    if (typeof route.data.preload === 'number') {
+      return Observable.timer(route.data.preload).switchMap(() => load());
+    }
+
+    return load();
+  }
+}