Oops! Property 'month' cannot be set on undefined value due to a TypeError

Despite not receiving any errors from Visual Studio Code, I’m encountering an error in Chrome's console.

Below is the code snippet from my interfaces.ts file:

export interface Data1{
month: string;
employeeName: string;
date: string;
employmentStatus: string[];

}

And here's the code snippet from tables.component.ts:

import { Component, OnInit } from '@angular/core';
import { Data1 } from '../../../shared/interfaces';

@Component({
  selector: 'app-tables',
  templateUrl: './tables.component.html',
  styleUrls: ['./tables.component.css']
})
export class TablesComponent implements OnInit {
  today = new Date();
  dataForTable1: Data1;
  months: string[] = [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"
  ]

  constructor() { 
    console.log(this.today.getMonth());
    console.log(this.months[this.today.getMonth()]);
    this.dataForTable1.month = this.months[this.today.getMonth()]
    this.dataForTable1.employeeName = '';
    this.dataForTable1.date = this.today.getDate().toLocaleString();
    this.dataForTable1.employmentStatus = [''];
  }
  ngOnInit() {
  }

}

After using console.log for debugging, the correct outputs are displayed but it still shows as undefined. I am currently working with Angular CLI version 1.7.4; Node version 8.11.1; Typescript version 2.8.1. Any assistance would be greatly appreciated.

Answer №1

In order to access the properties of Data1, it is essential that you define it as a class rather than an interface. Alternatively, you can define a concrete class that implements the interface. After defining either option, make sure to instantiate the class so that you can utilize its properties.

this.dataForTable1 = new CustomClass() 

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