Is there a way to access data.next() and data.complete() in the code below?

Could someone assist me in accessing the data.next() and data.complete() methods within the code snippet below? It seems like data is acting as an observer, but I'm encountering errors when trying to call these methods.

The issue is occurring within the component.ts file:

 this.authservice.registerform(form).subscribe(data => {
     data. ?
     this.ifsuccess = true;
     this.timer = setInterval(() => {
      this.router.navigate(['']);
     }, 1200);});

In the Service.ts file:

 registerform(data): Observable<any>{
return this.httpclient.post('http://localhost:3000/login',data);

As a newcomer to Angular and rxjs, any guidance on how to resolve this issue would be greatly appreciated.

Answer №1

Doesn't the data act as an observer here?

No, in this scenario, the data represents the emitted value.

When subscribing to an observable, you can provide handlers for next, error, and complete.

For example:

someObservable$.subscribe(
    next => console.log(`next value is: ${next}`),
    err  => console.log(`error is: ${err}`),
    ()   => console.log('someObservable$ completed!) 
);

In your case, only the first handler is provided in the subscribe() method. You can access the emitted value using the parameter name data:

this.authservice.registerform(form).subscribe(
    data => {
        // 'data' refers to the emitted value
        this.ifsuccess = true;
        this.timer = setInterval(() => {
            this.router.navigate(['']);
        }, 1200);
    }
);

If you need to handle completion or error, you can provide the other handlers as well:

this.authservice.registerform(form).subscribe(
    data => {
        // 'data' refers to the emitted value
        this.ifsuccess = true;
        this.timer = setInterval(() => {
            this.router.navigate(['']);
        }, 1200);
    },
    error => console.log('error occurred!'),
    ()    => console.log('registerform call completed')
);

Alternatively, you can pass a complete observer object to the subscribe() method instead of individual handler methods:

const myObserver = {
    next:    val => console.log(`next val: ${next}`),
    error: error => console.log(`error: ${error}`),
    complete: () => console.log('complete!')
};

someObserver$.subscribe(myObserver);

Here's a StackBlitz link with a sample demonstration.

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