checkbox based input item

The jQuery script is looking for an input named "sets[]". If that doesn't exist on the page, nothing will happen.
The inputs should have a name with brackets, like india[], not india, and sets[] rather than sets.
Thats because you build the inputs in a loop, and every input should get a unique name. If you use "india" as the name, only the first element with that name will be posted when you submit the form. If the name is "india[]", the result will be an array of values when the form is submitted.