Issue encountered when attempting to load asynchronous data into a form and subsequently sending it for submission

In my application, there is a component known as redirectComponent which is triggered and initialized by other components in the application when they call the route where it's located (http://localhost:4200/redirect/).

Upon being called, redirectComponent makes two API calls to fetch data that is then bound to a form in the template. After the data is successfully loaded, I access the form using ViewChild and submit it using the POST method. Once this is done, the job of the component is complete and a navigation back to the root URL is executed. However, even though the data from the API is resolved, the bound data in the form does not update and is submitted with undefined values.

TYPESCRIPT snippet:

export class RedirectComponent implements AfterViewInit {
  userName: string;
  sessionToken: string;
  sessionDuration: string;
  loggedUserNavigationUrl: string = 'someUrl.com';

  @ViewChild('microgameform')
  microgameForm: ElementRef;

  constructor(private thirdPartyGameService: ThirdPartyGameService) { }

  async ngAfterViewInit(): Promise<void> {
    await this.redirectUserToThirdParty();
  }

  async redirectToThirdParty(): Promise<void> {
    this.sessionDuration = '51';

    const gameToken: GameToken = await this.thirdPartyGameService.getGameToken();
    this.sessionToken = gameToken.Token;

    const nickNameResponse: NickName = await this.thirdPartyGameService.getNickname();
    this.userName = nickNameResponse.NickName;

    this.microgameForm.nativeElement.submit();
    this.router.navigateByUrl('/');
  }
}

HTML snippet:

<form #microgameform name="MicrogameForm" [action]="loggedUserNavigationUrl" method="POST" target="_blank">
    <input type="hidden" name="Username" [value]="userName"/>
    <input type="hidden" name="SessionToken" [value]="sessionToken"/>
    <input type="hidden" name="SessionDuration" [value]="sessionDuration"/>
</form>

Upon logging every variable just before

this.microgameForm.nativeElement.submit();
, I discovered that all variables were loaded but not bound to the form, resulting in undefined form values. This was the output I received:

variables and form values before submit

I believe I may have overlooked something in the process. My objective is to retrieve data from the API and then submit it to the form using the post method. It is possible that I am encountering a race-condition issue, but despite experimenting with calling the redirect from different lifecycle hooks like ngAfterViewInit, I continue to encounter various errors...

Answer №1

It is important to remember that when dealing with asynchronous calls, you must use the .subscribe() method:

this.externalService.fetchData().subscribe( response => {
    this.token = response.Token;
});

If you attempt to access this.token outside of the subscribe block, it will return undefined:

this.externalService.fetchData().subscribe( response => {
    this.token = response.Token;
    // Perform operations using the token
});
// The token has not been loaded yet => returns undefined

Answer №2

There was an issue concerning concurrency that arose between the execution of these two lines:

this.microgameForm.nativeElement.submit(); this.router.navigateByUrl('/');

Interestingly, when navigateByUrl is called, it causes the form values to be removed or in some cases removes the form from the DOM entirely. To resolve this, we implemented a solution where the HTML form is dynamically added to the document using TypeScript code and then submitted from there.

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