How do you properly include a new property in an Object using Typescript?

I am currently delving into the world of typescript. After exploring various sources like this one and that one, as well as trying out multiple solutions, I have encountered a challenge. I have a variable named incomingArticleObject which needs to be of type Object and contain a property called content of type String. Here is my current implementation:

export class OptionsPanelComponent implements OnInit {

  incomingArticleObject : Object = { 
                            content: String };

  constructor(...) { }

  ngOnInit() {
    this.incomingArticleObject = this._articleService.getClickedArticle();
    document.querySelector('#mydiv').innerHTML=this.incomingArticleObject.content; <=== ERROR
  }
}

However, there is an error that arises specifically in the ngOnInit method:

Property 'content' does not exist on type 'Object'.

I attempted to resolve this issue by creating an interface and assigning the value accordingly as shown below:

import { ... } from '@angular/core';
import ...

export interface MyObject {}

@Component({
  ...
})
export class OptionsPanelComponent implements OnInit {

  incomingArticleObject : MyObject = { 
                            content: String };

  constructor(...) { }

  ngOnInit() {
    this.incomingArticleObject = this._articleService.getClickedArticle();
    document.querySelector('#data-container').innerHTML=this.incomingArticleObject.content;
  }
}

Despite these efforts, the persistent error message continues to display with numerous sections of code underlined in red within vs code. Any guidance on how to rectify this would be greatly appreciated.

Answer №1

Consider implementing something along these lines:

myArticleObject: { text?: string } = { text: '' };

where

  • myArticleObject represents the name of your variable
  • ? indicates that the property is optional
  • : specifies the data type
  • { text?: string } defines the object with one property text, expecting a string
  • = marks the assignment
  • { text: '' } initializes an object with text property set to an empty string

Remember, the assignment is not required. Omitting it will result in the property having a value of undefined, and the undefined type does not include the text property.

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