List Box behave like Filter
I have a assignment to complete. I have to use list box which behave like filter box. Let me explain
I have 4 option 1-region 2-country 3-state 4-city
I have to use list box and user want if he select region only that specific region country show up and when he chose that country only that country related state show up and same way the city.
Can some one tell me how we can do that.