Could Not Assign Data Fetched From Native Storage To Variable

Ionic Native
1

Hello Friends,

One of my ionic project, am using Native Storage To Store Customer ID and Fetching It Where It Needs, by the way i have fetched from native storage successfully, and assigned to local variable and printed it also(in console). but while calling API the variable value is send as undefined. i could not track this problem long time, meanwhile this problem occurred occasionally. sometimes it have value and sometimes it happen, i have no idea about it, please help me to resolve this. Thanks in Advance.

Sample Code Structure:

…
import { NativeStorage } from ‘@ionic-native/native-storage/ngx’;
…

@Component({
…
})

export class CheckoutPage implements OnInit {

customer_id: any;

constructor(private nstore : NativeStorage) {
}

ngOnInit() {

this.getCustomerId(); 
confirmOrder();

}

getCustomerId(){

//get customer id from local storage

this.nstore.getItem('PROJECT_USER').then((user)=>{

  console.log("Fetching Success");

  console.log(user);

  console.log("User ID"+user.ID);

  this.customer_id=user.ID;

  console.log("Customer ID"+this.customer_id);

},(error)=>{

  console.log("Error Occure on Fetching Native Storage");

});

}

confirmOrder()
{

this.ds.confirmOrder(this.customer_id).subscribe((res)=>{      
 //here the customer id is undefined sometimes ,so i could not do futher process
 ....
},(err)=>{      
  ...

})

}

}

2

It may not seem related at first glance, but try reading through this thread, as I think you are in a very similar situation.

You are relying on side-effects of getCustomerId that you have no way of predicting the timing of. I would instead rearchitect getCustomerId so that it returns Promise<User> (and, incidentally, I would move that method totally out of the page and into a service provider). Also please consider adopting customary JavaScript naming conventions, which would make customer_id customerId instead. Give it a proper type, too. Every use of any is a missed opportunity to write more robust, self-documenting, and mantainable code.

3

thank you, i will try this.