What is the error in this code (jquery on 6 lines)?

Question

css

orderButton.popup({
      width : '650px',
      containerClass: 'popup_cont black',
      afterOpen : function(){
        loadpartdata();
      }
  });

Answer 1

It's not quite clear what you expect from the code?
And why can't it be written like this: afterOpen: loadpartdata();
Are you calling a function in order to call a function?

Answer 2

What error exactly occurs?