angular - Angular2: Find out if FormControl has required validator?

Question

does someone know a way to find out for an Angular2 FormControl if the required validor is registered for the control.

this.form = builder.group({name: ['', Validators.required]};

Can I then query the this.form.controls['name'] control if it is a required field? I know I can check if it is valid, but that's not what I want.

Kind regards, Marc

Answer 1

This function should work for FormGroups and FormControls

  export const hasRequiredField = (abstractControl: AbstractControl): boolean => {
    if (abstractControl.validator) {
        const validator = abstractControl.validator({}as AbstractControl);
        if (validator && validator.required) {
            return true;
        }
    }
    if (abstractControl['controls']) {
        for (const controlName in abstractControl['controls']) {
            if (abstractControl['controls'][controlName]) {
                if (hasRequiredField(abstractControl['controls'][controlName])) {
                    return true;
                }
            }
        }
    }
    return false;
};