The angular framework is unable to assign a value to the property 'xxxx' because it is currently undefined

Question

The angular framework is unable to assign a value to the property 'xxxx' because it is currently undefined

I am currently working on a simple application using Ionic (angular) and I am facing an issue with the error message:

Cannot set property 'origin' of undefined

Below is the interface for Product.ts:

export interface Products{
      id: number;
      new: boolean;
      origin: string;
      branch: string;
      product: string;
      quantity: string;
      productId: string;
      Detail_product: string;
      Installed: boolean;

}

Here is the relevant TypeScript code:

ngOnInit() {
  this.makeObject("03-2-450-2");
}

 makeObject(qrcode) {
    let obj: Products ;
    let Qrstring: string = qrcode;
    obj.origin! = Qrstring.substring(0, Qrstring.indexOf("-"));
    console.log(obj.origin);

  }
}

angular typescript ionic-framework

Answer 1

Answer №1

obj is declared but not assigned any value. To initialize it, you can use something like let obj: Products = {};. However, be aware that without assigning values to its properties, they will all be undefined.

It's recommended to assign values as you create the object. For example:

let Qrstring: string = qrcode;
let obj: Products = {
    origin: Qrstring.substring(0, Qrstring.indexOf("-")),
// set other required properties here
};
obj.origin! = Qrstring.substring(0, Qrstring.indexOf("-"));

If you don't need all properties, you can make them optional using the question mark operator in the type definition. For example, Installed: boolean; see: https://stackblitz.com/edit/typescript-tmupfv

To cast the object, you can do

let obj: Products = {} as unknown as Products;

(although this is a workaround and may cause issues later).

Answer 2

obj is declared but not assigned any value. To initialize it, you can use something like let obj: Products = {};. However, be aware that without assigning values to its properties, they will all be undefined.

It's recommended to assign values as you create the object. For example:

let Qrstring: string = qrcode;
let obj: Products = {
    origin: Qrstring.substring(0, Qrstring.indexOf("-")),
// set other required properties here
};
obj.origin! = Qrstring.substring(0, Qrstring.indexOf("-"));

If you don't need all properties, you can make them optional using the question mark operator in the type definition. For example, Installed: boolean; see: https://stackblitz.com/edit/typescript-tmupfv

To cast the object, you can do

let obj: Products = {} as unknown as Products;

(although this is a workaround and may cause issues later).

The angular framework is unable to assign a value to the property 'xxxx' because it is currently undefined

Answer №1

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