The function http.get() will not give back an observable object

NOTE: The issue lies in the ionViewDidLoad() function not being executed, as the http.get method does return an observable. I am attempting to receive the observable when making a request to later retrieve its json response. However, I am not encountering any errors and nothing is appearing in the browser's console either. It is perplexing why there is no output.

I have experimented with various URLs and thoroughly checked the imports. console.log doesn't show the data home.page.ts


    import { ServicioService } from '../servicio.service';
    import { Observable } from 'rxjs';
    import { HttpClient } from '@angular/common/http';
    ...
    ionViewDidLoad(){
          const hola = this.servicio.goWiki(this.userInput).
          subscribe((response) => {
            console.log(response);
           });
        }

servicio.service.ts


    import { Injectable } from '@angular/core';
    import { map } from 'rxjs/operators';
    import { HttpClient } from '@angular/common/http';
    import { Observable } from 'rxjs';

    @Injectable()
    export class ServicioService {

        constructor(public http: HttpClient) {
            console.log('goin!');
        }

        goWiki(userInput): Observable<any>{
            return this.http.get('https://www.reddit.com/r/gifs/top/.json?limit=105sort=hot');
        }

app.module.ts


    import { ServicioService } from './servicio.service';
    import { HttpClientModule } from '@angular/common/http';

    imports: [HttpClientModule, BrowserModule, IonicModule.forRoot(), AppRoutingModule, ComponentesModule],
      providers: [
        ServicioService,...

I'm hopeful that by receiving an observable, I will be able to read and extract specific information from it.

Answer №1

When using Ionic 4 with Angular, the traditional ionViewDidLoad lifecycle hook is no longer available. Instead, you should utilize the standard Angular ngOnInit hook.

For more information, visit https://medium.com/@paulstelzer/ionic-4-and-the-lifecycle-hooks-4fe9eabb2864

Lifecycles in Ionic 4

[...]

All Lifecycle hooks from Ionic 3 are still accessible except for ionViewDidLoad (as it's now the same as ngOnInit) and the two nav guards

Answer №2

When attempting to access the URL 'https://www.json.org', you may encounter various issues. One common problem could be related to CORS.

If your web application does not support CORS (cross-origin request sharing), it may prevent you from receiving a response. The browser typically blocks the call if this is the case. You can check the network log to confirm this – the initial call will likely be an OPTIONS request instead of a GET. The website should ideally specify which HTTP operations are allowed.

To test, try calling an app hosted on a local IIS server or on a machine within the same domain as your web application. In such cases, the http.get method should function correctly.

Answer №3

It appears that your component is lacking the 'http' in the constructor, and you are attempting to invoke the service incorrectly.

You should not include it within a variable in the method.

Answer №4

**service.ts**
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

 constructor(public http: HttpClient) { }

fetchData(): Observable<any> {

return this.http.get('https://www.reddit.com/r/gifs/top/.json?limit=105sort=hot').pipe(map(response => {
  return response;
}));

}

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