[jQuery] Auto-populate and get index in HTML Select

I need to modify a complex web app. The web page has a set of "cascading" selects. That is, choosing "A" in the first HTML select needs to trigger code to load a specific list of values into the second Select and choosing something there needs to trigger code to load a specific set of values int

[jQuery] auto populate

I am looking for some code to "auto populate (Auto complete ) " the dropdown boxes using the jquery and struts , If you have any idea please let me know.

[jQuery] Auto populate form elements using jquery, ajax, and mySQL?

Any way to autopopulate form elements using jquery and its ajax function from a MySQL database? Individually, I have gotten the form element to populate another element with a submit button using the JQuery Form Plugin. Also, I have gotten a form element to auto submit when a select option is se