I am not sure about you, but I rarely, if ever, want to validate a form field that is hidden from view!
Consider the case where you have a several required fields on the screen and the user can take some action that causes some fields to then be hidden. Well, using the default unobtrusive jquery validation, it will still validate those fields. If you do not have a 'SummaryValidation', this means the form just will not submit - no errors or anything because the error is displayed on a hidden field!
How do we get it to stop doing this? For now, I know of only one way. You need to add one line of code into the jquery.validate.unobtrusive.js file.
Add line 97 as shown below (and of course the comma at the end of line 96):