Turn validation OFF in code

Ionic Framework ionic-v3
1

I have a validation form like this:

file: ['', [Validators.required, Validators.minLength(3), Validators.maxLength(200)]]

i been trying to turn it off in code… to this:

file: ['', [Validators.minLength(3), Validators.maxLength(200)]]

I have try this out, but nothing work, helppp:

this.form.get('file').clearValidators();
this.form.get('file').setValidators([Validators.maxLength(200)]);
this.form.get('file').markAsTouched();
this.form.get('file').markAsDirty();
2

See: Angular reactive forms set and clear validators