[jQuery] Ajax enabled Links/Forms and AutoRefresh

I'm looking for following ajax functionaliaties. Can you please point me to some example or correct page in documentation. 1- Ajax enabled Link (a) that on click fetch data from server (database) and refresh an area of page with new data 2- Ajax enabled form, that on submit does same as above

[jQuery] ajax and links

is it possible to have the url and the data come from the link href using the ajax funtions in jquery?