Guide on Linking a Variable to $scope in Angular 2

Question

Guide on Linking a Variable to $scope in Angular 2

Struggling to find up-to-date Angular 2 syntax is a challenge. So, how can we properly connect variables (whether simple or objects) in Angular now that the concept of controller $scope has evolved?

import {Component} from '@angular/core'

@Component({
  selector: 'testtag',
  templateUrl: './simplecomponent.component.html',
})

export class SimpleComponent {

  public myNumber : number = 5; 

}

html:

<div>Greetings from the component template! {{myNumber}}</div>

The code functions as expected. I see "5" displayed in the template output. Despite this, most resources suggest using something like this.muNumber = 5;. Is this approach reserved for plain JavaScript? And does this hold significance when working with TypeScript? If so, how?

tl;dr: What are the current best practices for one-way and two-way binding in Angular 2 now that the "final" version is available?

javascript angular typescript

Answer 1

Answer №1

Upon reviewing your inquiry, it appears that you are keen on discovering a method to achieve an output of 5 without relying on the use of this.

The reason why 5 is being printed is due to the direct assignment of the initial value to the property myNumber within the class SimpleComponent. Since it is initialized with 5, the output will display as such upon rendering.

If you wish to incorporate this in your example, the structure of your component should be similar to this:

export class SimpleComponent {
  public myNumber : number; 
  constructor() {
    this.myNumber = 5;
  }
}

In essence, whenever you attempt to access a class property within a constructor or any function inside the component, utilizing this is essential.

Answer 2

Upon reviewing your inquiry, it appears that you are keen on discovering a method to achieve an output of 5 without relying on the use of this.

The reason why 5 is being printed is due to the direct assignment of the initial value to the property myNumber within the class SimpleComponent. Since it is initialized with 5, the output will display as such upon rendering.

If you wish to incorporate this in your example, the structure of your component should be similar to this:

export class SimpleComponent {
  public myNumber : number; 
  constructor() {
    this.myNumber = 5;
  }
}

In essence, whenever you attempt to access a class property within a constructor or any function inside the component, utilizing this is essential.

Guide on Linking a Variable to $scope in Angular 2

Answer №1

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