.data()

Store arbitrary data associated with the matched elements or return the value at the named data store for the first element in the set of matched elements.

Ajax Events

Ajax requests produce a number of different events that you can subscribe to. Here's a full list of the events and in what order they are triggered. There are two types of events: Local Events These are callbacks that you can subscribe to within the Ajax request object, like so: 1 2 3 4 5 … Continue reading

jQuery.when()

Provides a way to execute callback functions based on zero or more Thenable objects, usually Deferred objects that represent asynchronous events.

.is()

Check the current matched set of elements against a selector, element, or jQuery object and return true if at least one of these elements matches the given arguments.