What is the difference in ko.validation.group
and ko.validatedObservable
? Are there particular situations when I should use one over the other?
The ko.validation.group
just gives you an (computed) observable of all the error messages in a model. It only collects error messages of direct properties of the model.
The ko.validatedObservable
on the other hand not only collects the error messages, but also wraps the model in an observable and adds an isValid
property which indicates whether or not there are any error messages (i.e., the model was completely valid). Otherwise, they're essentially the same.
If you're only interested in collecting the error messages, the ko.validation.group
should be more than enough. If you need an observable that keeps track of whether or not the model is valid, the ko.validatedObservable
does some of the work for you.