Javascript add a PHP file.

Answer 1

I suggest studying AJAX.

There are also JavaScript libraries out there that make AJAX easy to use. jQuery is one.

Answer 2

You'll need to use Ajax for that.

Answer 3

Javascript works on the client side, so it is not possible to add php script, however you can use ajax for this purpose, from which u can interact with ur database.

For this u had to make a seperate php script and you can call it through your javascript function, which work instantly without reloading the page