I have two combo boxes in my JSP page named combo1 and combo2. I have a table in mysql called ZoneData. In this table there are two columns called zone and subzone. When the web page loads I want that zone names is read from ZoneData table and stored in combo1. This is working for me. Second, When I select a zone from combo1 all subzone names for that selected zone should be fetched from table and stored it in combo2. I am unable to do this.