rxjs

问题 I have an issue with the async pipe running on SSR. there are no errors, only an infinite loop (it seems that the server is waiting for the observable to be resolved). I am using: @nestjs/ng-universal Angular 9 Firebase Rxjs A simple case like this works: <p>{{ observable | async }}</p> But using structural directives do not work: ngIf <p *ngIf="(observable$ | async) > 5">{{ observable$ | async }}</p> Ngfor <p *ngFor="let item of items | async">{{ item }}</p> Using async is a good practice

问题 I have an issue with the async pipe running on SSR. there are no errors, only an infinite loop (it seems that the server is waiting for the observable to be resolved). I am using: @nestjs/ng-universal Angular 9 Firebase Rxjs A simple case like this works: <p>{{ observable | async }}</p> But using structural directives do not work: ngIf <p *ngIf="(observable$ | async) > 5">{{ observable$ | async }}</p> Ngfor <p *ngFor="let item of items | async">{{ item }}</p> Using async is a good practice

问题 I have an issue with the async pipe running on SSR. there are no errors, only an infinite loop (it seems that the server is waiting for the observable to be resolved). I am using: @nestjs/ng-universal Angular 9 Firebase Rxjs A simple case like this works: <p>{{ observable | async }}</p> But using structural directives do not work: ngIf <p *ngIf="(observable$ | async) > 5">{{ observable$ | async }}</p> Ngfor <p *ngFor="let item of items | async">{{ item }}</p> Using async is a good practice

问题 No code changes done, upgraded to Angular 10, everything works except a feature. There were no build errors, but in browser console able to see below error. I guess this may be related to angular.core, rxjs, but unclear..appreciate your help. core.js:4197 ERROR TypeError: templateRef.createEmbeddedView is not a function at ViewContainerRef.createEmbeddedView (core.js:10092) at NgTemplateOutlet.ngOnChanges (ng_template_outlet.ts:65) at NgTemplateOutlet

问题 No code changes done, upgraded to Angular 10, everything works except a feature. There were no build errors, but in browser console able to see below error. I guess this may be related to angular.core, rxjs, but unclear..appreciate your help. core.js:4197 ERROR TypeError: templateRef.createEmbeddedView is not a function at ViewContainerRef.createEmbeddedView (core.js:10092) at NgTemplateOutlet.ngOnChanges (ng_template_outlet.ts:65) at NgTemplateOutlet

问题 Server is processing multiple request at the same time. Call the service to check the status of each request. Service accepts list of ids and will give status of each id as following { id: number, status: number}; Status 1 is pending and 2 is complete Need to poll on all the pending request ids until all requests are complete I have a following recursive solution but need a concise RXJS solution for it poll(requestIds: Array<number>): void { if (requestIds.length > 0) { callService(requestIds

问题 Server is processing multiple request at the same time. Call the service to check the status of each request. Service accepts list of ids and will give status of each id as following { id: number, status: number}; Status 1 is pending and 2 is complete Need to poll on all the pending request ids until all requests are complete I have a following recursive solution but need a concise RXJS solution for it poll(requestIds: Array<number>): void { if (requestIds.length > 0) { callService(requestIds

问题 I have a resolver that needs to fetch data from two dependant Apis before the page is loaded. The second call is defined by the result of the first one, so I try to chain the two observables and need to return the second one at the end of the resolver. Before I tried to chain the observables I had: resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<MySecondObservable> { const observable1 = this.myService.getFirstDataSet(); observable1.subscribe( firstDataSet =>

问题 I am trying to do multiple HTTP requests in angular using forkjoin.But when I subscribe to Observable it doest not give any response. let data = this.email.map((email) => this.get_student_service.get_student_by_email_id(email) ); forkJoin([data]).subscribe((res) => { console.log(res); }); console.log('Execute'); Here is my service get_student_by_email_id(email) { return this.fire_store .collection('User', (ref) => ref.where('email', '==', email)) .valueChanges(); } 回答1: Ok, if you're getting

问题 I am trying to do multiple HTTP requests in angular using forkjoin.But when I subscribe to Observable it doest not give any response. let data = this.email.map((email) => this.get_student_service.get_student_by_email_id(email) ); forkJoin([data]).subscribe((res) => { console.log(res); }); console.log('Execute'); Here is my service get_student_by_email_id(email) { return this.fire_store .collection('User', (ref) => ref.where('email', '==', email)) .valueChanges(); } 回答1: Ok, if you're getting