Run the function solely once the asynchronous function has been executed

Question

Run the function solely once the asynchronous function has been executed

I need function F1() to wait for function F2() to fully execute and receive the response from a REST call in order to set some data.

Here is the code I attempted to use:

this.F1().subscribe(result => {
  this.F2(result);
})


    F1() {

      return this.graphDataService.getAvailableSpan(a, b).subscribe(res => {
        this.c = new Date(res.lastAvailableDate);
        return 1;
      }, error => {
        this.lastAvailableDate = new Date();
        return 1;
      })
    }

javascript angular typescript

Answer 1

Answer №1

Take a look at this helpful article on How to implement multiple API calls in Angular functions

async apicall(){

      let data1 = await f1(); //ensure the first function returns promises
      let data2 = await f2(); //ensure the second function returns promises

    }

Answer 2

Take a look at this helpful article on How to implement multiple API calls in Angular functions

async apicall(){

      let data1 = await f1(); //ensure the first function returns promises
      let data2 = await f2(); //ensure the second function returns promises

    }

Answer 3

Answer №2

Here's one way to accomplish that:

async performAsyncRequest() {
        this.response = await this.httpClient.fetch(this.apiUrl).toPromise();
        this.processResponse(this.response);
    }

Answer 4

Here's one way to accomplish that:

async performAsyncRequest() {
        this.response = await this.httpClient.fetch(this.apiUrl).toPromise();
        this.processResponse(this.response);
    }

Answer 5

Answer №3

To introduce asynchronicity to the flow, consider utilizing RxJS operators. Implement the following approach:

ngOnInit() {
  this.loadData().subscribe(result => {
    this.processData(result);
  });
}

loadData(): Observable<any> {
  return this.dataService.fetchData(a, b).pipe(
    tap((res) => {
      this.timestamp = new Date(res.lastFetchDate);
    }),
    catchError((error) => {
      this.lastFetchDate = new Date();
      return of(error);
    })
  );
}

Answer 6

To introduce asynchronicity to the flow, consider utilizing RxJS operators. Implement the following approach:

ngOnInit() {
  this.loadData().subscribe(result => {
    this.processData(result);
  });
}

loadData(): Observable<any> {
  return this.dataService.fetchData(a, b).pipe(
    tap((res) => {
      this.timestamp = new Date(res.lastFetchDate);
    }),
    catchError((error) => {
      this.lastFetchDate = new Date();
      return of(error);
    })
  );
}

Run the function solely once the asynchronous function has been executed

Here is the code I attempted to use:

Answer №1

Answer №2

Answer №3

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