I have 3 drop down lists, namely: sectors, sub sectors and categories. Each sector has a number of sub sectors, and each sub sector has a number of categories. Basically what I want to be able to do is allow the user to select a sector from the first ddl, this in turn automatically populates the second ddl (without refreshing the page) with related sub sectors, and once they select the sub sector it automatically populates the third ddl with relevant categories.
Any idea on how I would go about this?
Thanks in advance