.attr()
Get the value of an attribute for the first element in the set of matched elements or set one or more attributes for every matched element.
Category: Version 1.1
All the aspects of the API that were added, or had a new signature added, in the corresponding version of jQuery.
jQuery 1.1 Release Notes.
event.data
An optional object of data passed to an event method when the current executing handler is bound.
jQuery.ajaxSetup()
Set default values for future Ajax requests.
.one()
Attach a handler to an event for the elements. The handler is executed at most once per element.