I am experiencing a peculiar issue where a string is properly displayed in HTML, but appears as "undefined"

I'm currently facing an issue where I can successfully retrieve a string and display it on an HTML page, but I am unable to use it as a string in my TypeScript code. Below are the snippets of my code:

TypeScript:

user: User = new User();
  constructor(private authService: AuthService, private router: Router) { }

  ngOnInit() {
    this.user = this.authService.getCurrentUser();
    console.log(this.user.email)
  }

HTML:

<ion-item>
       <ion-label>Email: {{user.email}}</ion-label>
</ion-item>

The email should appear correctly in the HTML output, however, when attempting to log the email using console.log in the browser's console, it returns as undefined.

We apologize for any inconvenience this may cause and appreciate your assistance in advance.

Answer №1

The function <strong>this.authService.getCurrentUser()</strong> makes an asynchronous call, meaning that it takes some time to execute and the next lines of code will be executed first. This is why you are seeing 'undefined' in your <code>console.log()
.

To properly log the value, you can use the following approach:

ngOnInit() {
    this.authService.getCurrentUser().subscribe(res => {
         this.user = res;
         console.log(this.user.email)
    }    
}

Answer №2

The reason for this issue may be due to the asynchronous nature of the this.authService.getCurrentUser() method. By the time your service call is resolved, the compiler may have already moved to the next line.

What you are seeing in the HTML is a result of the view being updated after the resolution.

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