Angular ERROR: Trying to access rating property of an undefined value

I'm encountering an issue on a website where users can vote for their favorite animal. Whenever I try to select an animal to vote for, I receive an unclear error message that has been difficult to resolve even after searching online for a solution.

Any assistance would be greatly appreciated.

html

<div class='wrapper'>
    <div class="cat" *ngFor="let cat of twoCatsArray" (click)="voteForThisCat(cat.id)">
        <img class="cat-image" [src]="cat.url">
    </div>
</div>

ts.file

  // TypeScript code here...

https://i.sstatic.net/fwxpt.png

javascriptangulartypescript

Answer №1

It is possible that you are attempting to access the list this.allcat before it has been loaded or the id does not exist in the list. Please refer to the code snippet below for further clarification:

const list = [
    {id: 1, rating :1 },
    {id: 2, rating :2 },
    {id: 3, rating :3 },
    {id: 4, rating :4 },
];
const index = list.findIndex(i => i.id == 5);
console.log(index);
console.log(list[index]);
console.log(list[index].rating);

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