showing results for - "angular observable example"
Alyshialynn
06 Jan 2020
1import { Component, OnInit } from '@angular/core';
2import { Observable, of} from 'rxjs';
3import { map, filter, tap } from 'rxjs/operators'
4 
5 
6@Component({
7  selector: 'app-root',
8  templateUrl: './app.component.html',
9  styleUrls: ['./app.component.css']
10})
11export class AppComponent implements OnInit {
12 
13  obs = new Observable((observer) => {
14    observer.next(1)
15    observer.next(2)
16    observer.next(3)
17    observer.next(4)
18    observer.next(5)
19    observer.complete()
20  }).pipe(
21    filter(data => data > 2),                    //filter Operator
22    map((val) => {return val as number * 2}),    //map operator
23  )
24 
25 data = [];
26 
27  ngOnInit() {
28    this.obs1.subscribe(
29      val => {
30        console.log(this.data)
31      }
32    )
33  }
34 
35}
Irma
21 Jan 2021
1      
2        content_copy
3      
4      // Create an Observable that will start listening to geolocation updates
5// when a consumer subscribes.
6const locations = new Observable((observer) => {
7  let watchId: number;
8
9  // Simple geolocation API check provides values to publish
10  if ('geolocation' in navigator) {
11    watchId = navigator.geolocation.watchPosition((position: Position) => {
12      observer.next(position);
13    }, (error: PositionError) => {
14      observer.error(error);
15    });
16  } else {
17    observer.error('Geolocation not available');
18  }
19
20  // When the consumer unsubscribes, clean up data ready for next subscription.
21  return {
22    unsubscribe() {
23      navigator.geolocation.clearWatch(watchId);
24    }
25  };
26});
27
28// Call subscribe() to start listening for updates.
29const locationsSubscription = locations.subscribe({
30  next(position) {
31    console.log('Current Position: ', position);
32  },
33  error(msg) {
34    console.log('Error Getting Location: ', msg);
35  }
36});
37
38// Stop listening for location after 10 seconds
39setTimeout(() => {
40  locationsSubscription.unsubscribe();
41}, 10000);
42    
Annie
06 May 2016
1import {Observable} from 'rxjs';
2const foo = new Observable (subscriber => {
3  subscriber.next (42);
4  subscriber.next (100);
5
6
7});
8foo.subscriber(x => {
9  console.log(x);
10});
11
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