Cannot figure out TypeScript error TS2304: Cannot find name

Question

I have used the following code to assign the loadedIngredient an object through this code.

The code I used is

import { Component, OnInit, ViewChild, ElementRef, EventEmitter, Output } from '@angular/core';
import { Ingredient } from '../../shared/Ingredient.model';
@Component({
  selector: 'app-shopping-list-edit',
  templateUrl: './shopping-list-edit.component.html',
  styleUrls: ['./shopping-list-edit.component.css']
})
export class ShoppingListEditComponent implements OnInit {
   @ViewChild('name') ingredientName:ElementRef;
   @ViewChild('amount') ingredientAmount:ElementRef;
   @Output() inputValue = new EventEmitter<Ingredient>();


   constructor() { }

  ngOnInit() {
  }
  onSubmit(){
    const iname = this.ingredientName.nativeElement.value;
    const iamount = this.ingredientAmount.nativeElement.value;
    loadedIngredient:Ingredient = new Ingredient(iname,iamount);
    this.inputValue.emit(loadedIngredient);
  }

}

The errors that keep popping up is.

ERROR in src/app/shopping-list/shopping-list-edit/shopping-list-edit.component.t s(21,4): error TS7028: Unused label. src/app/shopping-list/shopping-list-edit/shopping-list-edit.component.ts(21,21): error TS2539: Cannot assign to 'Ingredient' because it is not a variable. src/app/shopping-list/shopping-list-edit/shopping-list-edit.component.ts(22,25): error TS2304: Cannot find name 'loadedIngredient'.

Can anyone please help.

Answer 1

Effectively you are attempting to reference an undeclared variable by the looks of it, which TypeScript will treat as an error. One solution is you could initialize a class property loadedIngredient and reference with this in methods such as onSubmit() :

import { Component, OnInit, ViewChild, ElementRef, EventEmitter, Output } from '@angular/core';
import { Ingredient } from '../../shared/Ingredient.model';

@Component({
  selector: 'app-shopping-list-edit',
  templateUrl: './shopping-list-edit.component.html',
  styleUrls: ['./shopping-list-edit.component.css']
})
export class ShoppingListEditComponent implements OnInit {
   @ViewChild('name') ingredientName:ElementRef;
   @ViewChild('amount') ingredientAmount:ElementRef;
   @Output() inputValue = new EventEmitter<Ingredient>();

   loadedIngredient: Ingredient;

   constructor() { }

   ngOnInit() {}

   onSubmit(){
     const iname = this.ingredientName.nativeElement.value;
     const iamount = this.ingredientAmount.nativeElement.value;
     this.loadedIngredient: Ingredient = new Ingredient(iname, iamount);
     this.inputValue.emit(this.loadedIngredient);
   }    
}

Or you need to specify a variable scope such as var , let , const for the local variable loadedIngredient within onSubmit() :

onSubmit(){
  const iname = this.ingredientName.nativeElement.value;
  const iamount = this.ingredientAmount.nativeElement.value;
  const loadedIngredient: Ingredient = new Ingredient(iname, iamount);
  this.inputValue.emit(this.loadedIngredient);
}

Thanks to the generous @lealceldeiro, here a StackBlitz demonstrating the error/solution.

Hopefully that helps!