Angular 2 Typescript: TypeError: this.validator is not a function

Question

I\'m building a form with ControlGroup and I\'m loading a class object in it. However I\'m running into the error mentioned in the title half of the time. Some forms do load

Answer 1

I had this error when I was binding an array of values in form builder the wrong way.

What I did:

fb.group({items: [1, 2, 3, 4]})

How it should be:

fb.group({items: [[1, 2, 3, 4]]})

You have to wrap everything into an array, otherwise angular thinks that [1, 2, 3, 4] is a form control definition rather then a form control value.