MY logic is to make a Library Management System in which it first asks for students Class Name, than if Intermediate is selected (which is 1 in database) then show Intermediate Groups else if BS is selected than show BS Department. The Code : codebin.org/view/0b6d0cbe The jQuery Code : codebin.org/view/32c5361b According to code above, When I select BS,Intermediate, Next Drop Down Meny doesn't appear. What I want is that drop down menu appear and when I select some value from it, it should ask for Student Library Number and then I want to make insert query.