Cannot read property 'push' of undefined in Angular 11

Question

When I call my function is throwing an error. I'm trying to insert my items via a forEach in angular. Below is the code which I tried.

Ts code

sItems: SaleProduct[];

btnSale() {

let tsale = new SaleProduct();

let tcustomerId = this.postForm.get('customer').value;

console.log(this.items);

this.items.forEach(obj => {
  tsale.CustomerId = tcustomerId;
  tsale.ProductId = obj.Id;
  tsale.CostPrice = obj.CostPrice;
  tsale.SellingPrice = obj.SellingPrice;

  console.log(tsale);
  console.log(this.sItems);

  this.sItems.push(tsale);
  });
}

Does this answer your question? Cannot read property 'push' of undefined(…) in angular2 — R. Richards
– R. Richards, Commented Aug 9, 2021 at 22:29
Initialize sItems inline: sItems: SaleProduct[] = [];. You've declared it but you haven't initialized it yet. — Matt U
– Matt U, Commented Aug 9, 2021 at 22:57

CodeWarrior · Accepted Answer · 2021-08-09 23:02:29Z

2

sItems: SaleProduct[];

This declares the object but doesn't initialize it and hence you get the error as the object is undefined.

Initialize it by the following code:

sItems: SaleProduct[] = [];

answered Aug 9, 2021 at 23:02

CodeWarrior

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