Using one jquery autocomplete to populate another jquery autocomplete on the same page. This example will use a jquery autocomplete to choose a state then, based on the state, another jquery autocomplete will be populated with zip codes for that state. Basically, the state chosen gets used as a filter in the query for the second autocomplete.
Zip result set limited to 20. Keep typing zip to narrow results. Unfamiliar with US zip codes? Try California as state and 90210 as zip.