Reactive Forms - mark fields as touched

The following function recurses through controls in a form group and gently touches them. Because the controls field is an object, the code call Object.values() on the form group's control field.

  /**   * Marks all controls in a form group as touched   * @param formGroup - The form group to touch   */  private markFormGroupTouched(formGroup: FormGroup) {    (<any>Object).values(formGroup.controls).forEach(control => {      control.markAsTouched();      if (control.controls) {        this.markFormGroupTouched(control);      }    });  }

From Angular 8/9 you can simply use

this.form.markAllAsTouched();

To mark a control and it's descendant controls as touched.

AbstractControl doc

Regarding to @masterwork's answer.I tried that solution, but I got an error when the function tried to dig, recursively, inside a FormGroup, because there is passing a FormControl argument, instead of a FormGroup, at this line:

control.controls.forEach(c => this.markFormGroupTouched(c));

Here is my solution

markFormGroupTouched(formGroup: FormGroup) { (<any>Object).values(formGroup.controls).forEach(control => {   if (control.controls) { // control is a FormGroup     markFormGroupTouched(control);   } else { // control is a FormControl     control.markAsTouched();   } });}