Angular Router Course

Author: Your Name

src/app/app-routing.module.ts

@@ -47,7 +47,13 @@ const routes: Routes = [
   imports: [
       RouterModule.forRoot(
           routes, {
-              preloadingStrategy: CustomPreloadingStrategy
+              preloadingStrategy: CustomPreloadingStrategy,
+              scrollPositionRestoration:'enabled',
+              paramsInheritanceStrategy: 'always',
+              relativeLinkResolution: 'corrected',
+              malformedUriErrorHandler:
+                  (error: URIError, urlSerializer: UrlSerializer, url:string) =>
+                    urlSerializer.parse("/page-not-found")
           })
   ],
   exports: [RouterModule],

src/app/courses/services/lesson-detail.resolver.ts

@@ -15,9 +15,7 @@ export class LessonDetailResolver implements Resolve<LessonDetail> {
     resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot):
         Observable<LessonDetail>  {
 
-        // http://localhost:4200/courses/angular-router-course/lessons/17
-
-        const courseUrl = route.parent.paramMap.get("courseUrl"),
+        const courseUrl = route.paramMap.get("courseUrl"),
             lessonSeqNo = route.paramMap.get("lessonSeqNo");
 
         return this.courses.loadLessonDetail(courseUrl, lessonSeqNo);