Binding objects and properties from Angular2/Typescript to a template

Disclaimer: Seeking insight on the correct approach or any additional information
_____________________________________________________________________
ANGULAR1

When working with angular1, we had the option to define our objects in the following manner.

$scope.user={};
$scope.user.name="micronyks";
$scope.user.age="27";

Alternatively, we could directly assign values like this:

$scope.user={name:"micronyks",age:"27"}

The binding to the template would appear as follows:

<div>My name is {{user.name}} & I'm {{user.age}} year(s) old. </div>


______________________________________________________________________
ANGULAR2

In angular2 using Typescript,

models.ts

export class LoginModel()
{
  private name:string;
  private age:number;
}

app.ts

import {LoginModel} from '../models.ts';

user=new LoginModel()
constructor()
{
   this.user.name="micronyks"
   this.user.age="27"
}

app.html

<div>My name is {{user.name}} & I'm {{user.age}} year(s) old. </div>

Is it possible to directly create an object with properties and values?

I understand that TypeScript primarily deals with types.

If anyone has profound insights on this subject matter, please enlighten me further.

To showcase something, feel free to use this plunker: Plunker

Answer №1

In Angular2, like in Angular1, you have the flexibility to use literal objects. The advantage of using Angular2 with TypeScript is that you can take advantage of its strong typing system. This allows you to specify types for properties and parameters, helping to catch errors related to incorrect types.

import {LoginModel} from '../models.ts';

export class Test {
  user:LoginModel = new LoginModel()

  constructor() {
    this.user.name = 'micronyks';
    this.user.age = 27;

    this.someMethod(this.user);
  }

  someMethod(user:LoginModel) {
    // ...
  }
}

An important aspect to consider is dependency injection, where Angular2 utilizes type information to inject instances. Otherwise, you would need to use @Inject.

Another benefit is the impact on your IDE - by defining types instead of using no type or any, you can take advantage of completion features.

You also have the freedom to mix things up, allowing for a combination of strongly typed and loosely typed values:

interface INumbersOnly {
  [key: string]: number;
}

var x: INumbersOnly = {
  num: 1, // works fine
  str: 'x' // will give a type error
};

Ultimately, the choice is yours! ;-)

For more details, check out this question on Stack Overflow:

  • typescript strong typing - specifying object value types

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