Difficulty in loading the uploaded API data into the template

I am facing an issue with a service that retrieves user data based on the Token stored in localStorage. The data is returned correctly until it reaches my component.

The problem lies in the code snippet present in my component.ts file: https://i.sstatic.net/IEpvG.png

Even though everything seems to be fine, the console shows that the user property is printed as undefined even after assigning the return value. A screenshot illustrating this can be seen below. https://i.sstatic.net/CIVim.png

When attempting to use the user property in the HTML template, I receive errors indicating that the data cannot be loaded. I have tried using async pipes like (user$ | async) as user and safe navigation like user?.email, but none of these solutions resolved the issue. I am puzzled by this situation and any assistance would be greatly appreciated!

Answer №1

The variable user$ is a representation of a stream and should be assigned in the following manner:

export class {
    // defining a stream type
    user$: Observable<User>;

    ngOnInit() {
        // initializing the stream type
        this.user$ = this.clienteHeaderService.getUser();
    }

}

Additionally, remember to use the |async pipe in the template.

Answer №2

this.user may not be immediately available right after subscribe() is called. It is possible that the getUser() function has not emitted any result yet when console.log(this.user) is executed.

If you simply want to check the value of this.user, consider doing so within the callback function of subscribe()

this.clientHeaderService.getUser().subscribe((response) => {
  this.user = response;
  console.log(this.user); // at this point, this.user should be accessible
})

When working on the template side, you can directly access the user using {{ user }}.

It is recommended to share your minimal reproducible code on https://stackblitz.com/ for easier assistance with debugging.

Answer №3

Subscribing in JavaScript works similarly to a promise, with the addition of a callback function.

.subscribe(response=>this.user=response)

Callbacks are queued at the end of the current event loop. This means that you may be trying to access:

console.log(this.user)

before the callback within your subscribe method is actually executed.

Instead, it's recommended to use:

.subscribe((response) => {
  this.user=response;
  // You can safely access the value of this.user here
  // or call other functions to work with this.user
  console.log(this.user);

})

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