While i hadn't sign-in the JpetStore.But i bought a cat,I clicked the "continue" button on the "checkout.jsp",so told me input the userid and password.
While i sign-in the JpetStore,If i cliecked the "continue" button on the "checkout.jsp " i can look the order information.


My question is i don't know the code how control "continue" button open the "viewOrder.jsp" and "signonForm.jsp"? And i don't know where is the code ?
Thank you!