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Questions tagged [subscribe]

994 questions
319
votes
10 answers

Subscribe is deprecated: Use an observer instead of an error callback

When I run the linter it says: subscribe is deprecated: Use an observer instead of an error callback Code from this angular app: this.userService.updateUser(data).pipe( tap(() => {bla bla bla}) ).subscribe( …
ismaestro
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95
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4 answers

Angular 2 - Checking for server errors from subscribe

I feel like this scenario should be in the Angular 2 docs, but I can't find it anywhere. Here's the scenario submit a form (create object) that is invalid on the server server returns a 400 bad request with errors I display on the form after the…
Stephanie
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57
votes
4 answers

tap() vs subscribe() to set a class property

I am very new to rxjs and was just wondering is it ok to setup a class property by piping the stream and tapping it, or it should i do it in the subscribe. To me either way works, just wonder if it is ok to do it as I see fit to my eyes or there is…
bulforce
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56
votes
5 answers

Should I unsubscribe from events?

I have 3 questions concerning events: Should I always unsubscribe events that were subscribed? What happens if I do NOT? In the below examples, how would you unsubscribe from the subscribed events? I have for example this code: Ctor: Purpose: For…
Elisabeth
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45
votes
5 answers

Angular 2: How to call a function after get a response from subscribe http.post

I need to call a method after get the data from the http post request service: request.service.TS get_categories(number){ this.http.post( url, body, {headers: headers, withCredentials:true}) .subscribe( response => { this.total…
Louise
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44
votes
4 answers

RxJS Observables nested subscriptions?

What's the way to simplify something like the following code example? I can't find the right operator.. could anyone give a short example? this.returnsObservable1(...) .subscribe( success => { this.returnsObservable2(...) …
Max Solid
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31
votes
2 answers

Observables : Cancel previous http request on new subscription call

I am working on a search functionality for my project. Once the user types anything on the search bar; on any change in search text I'll be sending the text to backend for validation and receive a response (error or no error in…
D_S_X
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30
votes
4 answers

Angular 2 observable subscribing twice executes call twice

Problem I subscribe to an httpClient.get observable twice. However, this means that my call gets executed twice. Why is this? Proof For every subscribe() I do, I get another line in the login page. Code (onSubmit() from login page button) var…
Rico
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24
votes
2 answers

q.all for angular2 observables

is there something like q.all to resolve all http api requests in angular2? In angular1, I can do something like this: var promises = [api.getA(),api.getB()]; $q.all(promises).then(function(response){ // response[0] --> A // response[1] …
kdu
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19
votes
0 answers

Webcal / .ics subscribe to feed from within Android App

For a recent application, I want to provide the ability to subscribe to a calendar feed while staying on the android device. Going to calendar.google.com and manually adding the http link (ics) isn't an option. I can't really find a lot of…
Jordy
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18
votes
1 answer

Is it safe to unsubscribe from an event that has never been subscribed?

For example, if these codes: Button button1 = new Button(); // ... button1.Click -= button1_Clicked; are executed before: button1.Click += button1_Clicked; I found no error or exception, but I am wondering if there…
Setyo N
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18
votes
2 answers

Mailchimp subscribe using jQuery AJAX?

What is a complete jQuery solution to subscribing uses to a list on Mailchimp? The problem is that most solutions either use a library or require server side code. I want a quick elegant solution, which gives me complete control over the UI, hence…
Nagra
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15
votes
1 answer

combineLatest with FormControl valueChanges event binding not emitting

I listen to 2 forms via 2 [formControl] "toppings":array and "toppings2":array. I must have the 2 values of the forms in the same time. So i combine my two observables with "CombineLatest" My code: ngOnInit()…
Newbiiiie
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14
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1 answer

Javascript Websocket Subscribe to Channel

I am trying to subscribe to channel using native WebSocket in vanilla javascript (without using any library) [as I have just read it's possible but I am not sure - please correct me if I'm wrong]. I am trying to get the latest price of bitcoin let…
senty
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13
votes
3 answers

How to programmatically subscribe a user to a google calendar using javascript?

Hey i'm able to authenticate and authorize a user with the javascript API for google calendar. what i want to do next is subscribe that user to a public calendar. I was thinking i could just call the google.gdata.calendar.CalendarEntry constructor…
Devin Crossman
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