AJAX loader on page navigation - Oracle Apex 4

I am pretty new to apex development and am having trouble finding documentation on AJAX implementation. I have a few buttons that navigate to different pages. Some of these pages run very expensive sql statements and it takes a while to load. I would like to add an ajax loader just to give the user some feedback that the system is c开发者_运维知识库urrently loading the next page.

How can I do something like this? Does Apex 4 include AJAX or do I need to load a framework such as JQuery? Any help or direction would greatly be appreciated.

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Apex 4.0 includes jQuery. It also has a concept called Dynamic Actions that would enable you to achieve your requirement very easily.