Disable Validators.Required Angular2

Question

I have the following form using Validators.

 this.formulario = new FormGroup({
    CodigoTemp: new FormControl(null, [Validators.required]),
});

I need to disable Validators.Required if a checkbox is checked. Is there any way to do this?

Utilizo Angular 2.

Answer 1

You can use the method setValidators, thus:

// Para utilizar uma validação
this.formulario.controls.CodigoTemp.setValidators([
    Validators.required,
]);

// Para remover as validações
this.formulario.controls.CodigoTemp.setValidators(null);

It is worth remembering that this method will replace all existing validations, in case of removing the validations, no problem. If you want to add a new validation, for example, maxLength, should reset existing validations and the new validation you want, thus:

this.formulario.controls.CodigoTemp.setValidators([
    Validators.required,
    Validators.maxLength(50),
]);

As far as I could find, there is still no functionality to add validations, such as discussed here.