Can you tell me how to work with check in checkout btn?

Question

Can you tell me how to work with check in and checkout button? i want that whenever i click on check rates it will show me automatically list of available dates which is get from database and also i don't know how to get from database as well. furthermore, can you tell me how to call two javascript function in html. i am working with mvc 4. please help me out . thanking you in advance