Dynamically updating selectlist using Jquery and Ajax

In many web site we have seen that on selecting country, state or city list is updated. In this article i am showing how to update children select list on changing parent list. To do this i am using jquery and ruby on rails.although it will works for almost all languages For this article, I am updating city list on changing states. So one state has many cities,and city belongs to state. and city_list.xxx gives following html on processing state

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