Validation works directly with the model and you can pick a number of ways to check the input and have it return an appropriate error message. The view/control

Validation works directly with the model and you can pick a number of ways to check the input and have it return an appropriate error message. The view/controller layers are very flexible and can be hooked up to anything from an HTML template using Yii to angular/bootstrap (which is what we're using) or another framework to handle the forms.