I am having trouble getting data added to my array using the .subscribe method

I've been working on retrieving data from the database and storing it in the accountInfo array. Despite successfully fetching the data, the array appears to be empty when I log it. I've tried troubleshooting various options but haven't been able to identify the root cause of the issue.

account.component.ts

import { Component, Inject, OnInit } from '@angular/core';
import { AccountService } from './account.service';
import { MatDialog, MatDialogRef, MAT_DIALOG_DATA } from '@angular/material';
import { AccountInfo } from './accountListItem';

@Component({
  selector: 'app-account',
  templateUrl: './account.component.html',
  styleUrls: ['./account.component.scss'],
  providers: [AccountService],
})
export class AccountComponent implements OnInit {

  public accountInfo = [];
  public userId: string;
  constructor(private accountService: AccountService) { }

  ngOnInit() {
    this.userId = localStorage.getItem('user_id');
    this.accountService.getAccountInfo(this.userId)
    .subscribe(data => this.accountInfo = data);
    console.log(this.accountInfo);
  }
}

account.service.ts

import { Injectable } from '@angular/core';
import { Observable , of } from 'rxjs';
import { HttpClient } from '@angular/common/http';
import { AccountInfo } from './accountListItem';
import { environment } from '../../environments/environment';

@Injectable()
export class AccountService {
  constructor(private http: HttpClient) {}

  getAccountInfo(userId: any): Observable<AccountInfo[]> {
    return this.http.get<AccountInfo[]>(`${environment.apiUri}/user?userid=${userId}`);
  }
}

Answer №1

To ensure that the console.log() statement captures the accountInfo, it must be placed inside the subscribe function. This is because the accountInfo object is only accessible once the asynchronous call has been completed, as shown in the code snippet below:

ngOnInit() {
  this.userId = localStorage.getItem('user_id');
  this.accountService.getAccountInfo(this.userId)
  .subscribe(data => {
    this.accountInfo = data;
    console.log(this.accountInfo);
  });
}

Answer №2

When retrieving data from a database, it is recommended to utilize the subscribe function as shown in the code snippet below. This will help prevent errors and allow you to display the retrieved data by logging it using console.log:

this.accountService.getAccountInfo(this.userID).subscribe(
     data => {
        this.userInfo = data;
        console.log(this.userInfo);
    },
     error => {
        console.log(error);
    },
     () => {
        // 'onCompleted' callback.
    }
);

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