Function setUpModelChangePipeline

packages/forms/src/directives/shared.ts:291–306

(control: FormControl, dir: NgControl)

}

function setUpModelChangePipeline(control: FormControl, dir: NgControl): void {
  const onChange = (newValue?: any, emitModelEvent?: boolean) => {
    // control -> view
    dir.valueAccessor!.writeValue(newValue);

    // control -> ngModel
    if (emitModelEvent) dir.viewToModelUpdate(newValue);
  };
  control.registerOnChange(onChange);

  // Register a callback function to cleanup onChange handler
  // from a control instance when a directive is destroyed.
  dir._registerOnDestroy(() => {
    control._unregisterOnChange(onChange);
  });
}

/**
 * Links a FormGroup or FormArray instance and corresponding Form directive by setting up validators