What sets apart [ngModel], [(ngModel)], and ngModel from each other?

When it comes to [(ngModel)], data can flow back and forth between the component and view seamlessly. On the other hand, [ngModel] appears to be one way binding but surprisingly delivers the same functionality as [(ngModel)].

Using [ngModel], I am able to retrieve data from the component and display it in the view, while also being able to update the value from the view back to the component. If [ngModel] is supposed to be only one way binding, how does it manage this bidirectional data exchange? It's a bit perplexing to me.

I have another inquiry: Does ngModel, when paired with ngForm, operate as a one way binding?

  <input class="form-control" type="text" name="designation" [ngModel]="currentProduct.name"> 

It seems to provide identical functionality as:

<input class="form-control" type="text" name="designation" [(ngModel)]="currentProduct.name"> 

Answer №1

  1. [ngModel]="currentProduct.name"
    represents one-way binding

  2. [(ngModel)]="currentProduct.name"
    signifies two-way binding

So, with the first syntax, you can send data from the parent component to the child.

While with the second syntax, you can exchange data both ways, from parent to child and vice versa.

To learn more, refer to the official Angular documentation

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