In Angular 5, a variable's value becomes undefined once it is subscribed to outside of its assigned

I keep encountering an undefined value when trying to assign the subscribed value to a variable in my code snippet below.

service.ts

     getIpAddress() : Observable<any> 
     {
      return this.http
      .get(this.Geo_Api)
      .map((response: Response) => {  return <any>response.json() 
      } )
      .catch(this.handleError);
      }

component.ts

 constructor(private apiservice: ApiService )
 {
   this.getIpAddress(); 

 }
 ngOnInit() {  console.log(this.client_ip$);   } 

 getIpAddress()
 {

    this.apiservice.getIpAddress()
    .subscribe(data => {
    this.client_data$       =   data.ip;
    this.client_ip$     =   this.client_data$; 
  });

  }

Answer №1

Injecting the service into the component is necessary in order to utilize the functionality.

constructor(private apiservice: Apiservice)

Answer №2

class IPGetter{
  constructor(private api: ApiService ) {}

  ngOnInit() {
    this.fetchIP(); 
  }

  fetchIP(){
    this.api.getIpAddress()
    .subscribe(response => {
      this.clientData = response.ip;
      this.clientIP = this.clientData; 
      this.outputIP();
    });
  }

  outputIP(){
    console.log(this.clientIP);
  }
}

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