Angular 4: How to watch an object for changes?

Question

ETA: I know that there are various ways to watch my form for changes. That is not what I am trying to do. As the title says, I am asking how to watch for change

Answer 1

I need to subscribe directly to changes on the model.

Then you need to listen to model changes with ngModelChange

Template:

Class:

doSomething(event) {
  console.log(event); // logs model value
}

DEMO