Question : JavaScript, arrays, and DropDown

I want to do the following on the client side, without hitting the server.   When the user clicks a dropdown list and selects a item from the list, I need to display a set of related data.  Can I do this all in Java Script?  The initial set of data comes from the server from the database.  

Answer : JavaScript, arrays, and DropDown

If the related data can come (is coming) in the first hit itself, you will be able to do this at client side. You will have to handle it using Javascript (OR some latest javascript libraries like json, jquery, etc)