rxjs

I tried to make a http.get() call with these two methods. First: getResults(){ return this.http.get('http://localhost/api.php') .toPromise() .then( data => data.json() ); } Error Shown: 3 122412 error EXCEPTION: Uncaught (in promise): Response with status:0 for URL: null 4 122413 error ORIGINAL STACKTRACE: 5 122413 error Error: Uncaught (in promise): Response with status: 0 for URL: null .......... Second: getResults(){ return new Promise((resolve, reject) => { this.http.get('http://localhost/api.php') .map(res => res.json()) .subscribe(data => { resolve(data); }, (err) => { reject(err); }); }

I am trying to call a Method in my Component from a a Service . What is the proper way to do this? I have tried to use rxjs Subject to create an Observable, but I cannot get it to fire. import {Subject} from 'rxjs/Subject'; export class MyService { callComponent = function(value) { let invokeEvent = new Subject(); invokeEvent.next({some:value}) } } and in my Component export class MyComponent { constructor(private _myService: MyService) { this._myService.invokeEvent.subscribe(value => console.log(value)) } } Here's the plunker: http://plnkr.co/edit/WKSurRJMXo5JZOPrwSP5?p=preview Change your

I was wondering about best practices regard using pure observable vs subscribe to an observable and use an array. option 1 - "pure observable" this.schools = this.angularFire.database.list('schools') and then in the HTML use async pipe (and rxjs operators for handling the data) option 2 - "subscribe to array" this.angularFire.database.list('schools').subscribe (response => this.schools=response) and then treat it as a normal array. As olsn pointed out in the comments, it is always more practical to use the async pipe to handle this situation. However, if you choose to use the manual subscribe

I'm currently using this to perform notifications: /** * Create notifications that broacast * the entire set of entries. */ protected notify = new ReplaySubject<E[]>(1); IIUC I can switch out the ReplaySubject<E[]>(1) with AsyncSubject<E[]>() ? Would this be an apple to apple switch or might here be semantic differences? No, they're very much not the same. ReplaySubject(1) will always replay the latest emission no matter when the observer subscribes. It can emit any number of times. AsyncSubject ignores all emissions until the observable completes, then emits the last emitted value. It can

In my component html, I am using the asyncPipe to subscribe to this http service. The service maps the json response object to an array of class instances. This all works great, but I would like http service to poll every few seconds. I've tried a bunch of things (like interval), but it seems RXJS is a bit of a minefield at the moment. Has anyone implemented this kind of thing using Angular 6? fetch(command, params?) { return this.http.post(`http://localhost:4000/${command}`, params) .pipe( map((data: Data) => { const statuses: Status[] = []; for (const statusKey of Object.keys(data.statuses))

I've been working on an application in Angular2/CLI/NGRX and things have been going well until recently. I'm noticing some pretty big spikes in performance especially with consecutive dispatches within the same container. For example lets say I have the following defined: public appEnvironment$: Observable<IEnvironment>; public assessment$: Observable<IAssessment>; public assessmentComments$: Observable<ICommentActivity[]>; public assessmentEvidence$: Observable<IEvidenceActivity[]>; public assessmentIssues$: Observable<IIssueActivity[]>; public assessmentSurvey$: Observable<ISurvey>; public