All the aspects of the API that were added, or had a new signature added, in the corresponding version of jQuery.
jQuery 1.5 also includes a large rewrite of the Ajax module, which has a number of extensibility improvements. You can find out more about those improvements in the Extending Ajax documentation.
Additionally jQuery 1.5 includes a new Deferred callback management system you can learn more about in in the Deferred Object documentation%.
jQuery source files version 1.5:
Returns:XMLHttpRequest
Perform an asynchronous HTTP (Ajax) request.
Create a deep copy of the set of matched elements.
deferred.done() New in 1.5!
Returns:Deferred
Add handlers to be called when the Deferred object is resolved.
deferred.fail() New in 1.5!
Returns:Deferred
Add handlers to be called when the Deferred object is rejected.
deferred.isRejected() New in 1.5!
Returns:Boolean
Determine whether a Deferred object has been rejected.
deferred.isResolved() New in 1.5!
Returns:Boolean
Determine whether a Deferred object has been resolved.
deferred.reject() New in 1.5!
Returns:Deferred
Reject a Deferred object and call any failCallbacks with the given args.
deferred.rejectWith() New in 1.5!
Returns:Deferred
Reject a Deferred object and call any failCallbacks with the given context and args.
deferred.resolve() New in 1.5!
Returns:Deferred
Resolve a Deferred object and call any doneCallbacks with the given args.
deferred.resolveWith() New in 1.5!
Returns:Deferred
Resolve a Deferred object and call any doneCallbacks with the given context and args.
deferred.then() New in 1.5!
Returns:Deferred
Add handlers to be called when the Deferred object is resolved or rejected.
Returns:jqXHR
Load data from the server using a HTTP GET request.
Returns:jqXHR
Load data from the server using a HTTP GET request.
Returns:XMLHttpRequest
Load a JavaScript file from the server using a GET HTTP request, then execute it.
jQuery.hasData() New in 1.5!
Returns:Boolean
Determine whether an element has any jQuery data associated with it.
jQuery.parseXML() New in 1.5!
Returns:XMLDocument
Parses a string into an XML document.
Returns:jqXHR
Load data from the server using a HTTP POST request.
jQuery.sub() New in 1.5!
Returns:jQuery
Creates a new copy of jQuery whose properties and methods can be modified without affecting the original jQuery object.
jQuery.when() New in 1.5!
Returns:Deferred
Provides a way to execute callback functions based on one or more objects, usually Deferred objects that represent asynchronous events.
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