Angular 2 is having trouble with object dot notation in Typescript and is expecting a semicolon

Hello, I am currently transitioning a project from Angular 1 to TypeScript and Angular 2. One issue I'm facing is getting some property definitions into the Angular 2 component.

Below are the property definitions causing trouble:

import { Component } from 'angular2/core';
@Component({
  selector: 'contact-detail',
  templateUrl: 'app/contacts/contact-detail.template.html',
  styleUrls: ['app/contacts/contact-detail.style.css']
})
export class ContactDetailComponent {
  contactFormOptions = {};
  contactFormOptions.initDateDefault = '';
  contactFormOptions.followUpDateDefault = '';
  contactBasicInfo: {};
  contactBasicInfo.bdMonth = '0';
  contactBasicInfo.bdDay = '0';
}

In Angular 1, defining object properties with dot notation (e.g., 

contactFormOptions.initDateDefault = '';
) worked fine. However, Typescript is throwing an error, expecting a semicolon instead of using dot notation for these properties. Can anyone shed light on why this is happening? What am I overlooking?

Thank you!

angularjstypescriptjavascript-objects

Answer №1

If you're using TypeScript and want to incorporate moment.js, you'll need a definition file for it. Luckily, this definition file comes with the moment.js package itself, so all you have to do is add the reference. You can find the necessary information at Definitely Typed here:

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/moment/moment.d.ts

To clarify, what you'll need to include in your code is:

declare var moment: moment.MomentStatic;

Answer №2

Aha! My journey into the world of Object-Oriented Programming (OOP) has just begun. What I realized was that I needed to define the properties and their respective types, then set values for them within a constructor (or method).

export class ContactDetailComponent {
  contactFormOptions: any = {};
  contactBasicInfo: any = {};

  constructor ( ) {
    this.contactFormOptions.initDateDefault = moment();
    this.contactFormOptions.followUpDateDefault = moment().add(7, 'days');
    this.contactBasicInfo.bdMonth = '0';
    this.contactBasicInfo.bdDay = '0';
  }
}

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