Awesome

backbone-xhr-events

Do more than what the default Backbone Model/Collection request event does for you. The primary benefits are

Provide robust lifecycle events (before-send, after-send, success, error, complete)
Emit type specific XHR events to allow for focused binding
Give ability to see if a model currently has any pending XHR activity
Provide a global event bus to bind to all Model/Collection XHR activity
Allow requests to be intercepted to, for example, return cached content
Add ability to intercept and override response data before it is returned to the Model/Collection
Provide event forwarding capabilities so other objects can simulate XHR activity to match another Model/Collection
Make all event names and additional attributes overrideable to meet the needs of your particular project
Give external entities a way to observe ajax activity on your Collections and Models