Give early warning to users of form errors before they submit. With client side validations, the user can correct any errors prior to submitting the form.
Infinite scrolling is now a common feature and there are several cases where it is really useful. For instance there are some websites where we simply can’t imagine a good pagination system, like Twitter or even Facebook.
A continuation from Episode 20 where we explore rendering the user's edit pages in a modal on a per request basis. Instead of rendering all modals for the users in the index, we will request them using remote javascript.