I think the reason might be (not 100% sure) is that the form element when users type in their changes it goes into nested html document inside a iframe, and my jQuery onchange event doesn't fire off for any changes inside a nested html document.
Dynamic actions also do not work if you create a simple Rich text area and write javasscript codes to fire during onchange events.
Would be grateful if someone can suggest a way to make my onchange events work Rich Text Editor fields.
I am using Apex 4.2.2, Theme 26.
The field is Rich Text Editor of type CKEditor3, Toolbar = Intemediate.