All files / src/app/shared/forms/utils form-utils.ts

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import { FormGroup } from '@angular/forms';
 
/**
 * Marks all fields in a form group as dirty recursively (i.e. for nested form groups also)
 *
 * @param formGroup The form group
 */
export function markAsDirtyRecursive(formGroup: FormGroup) {
  Object.keys(formGroup.controls).forEach(key => {
    if (formGroup.controls[key] instanceof FormGroup) {
      markAsDirtyRecursive(formGroup.controls[key] as FormGroup);
    } else {
      formGroup.controls[key].markAsDirty();
      formGroup.controls[key].updateValueAndValidity();
    }
  });
}