Question

I do not understand how to get change event to call a function.

$(function () {

  function foo() {
    alert("ok");
  }

  //works
  $('#myElement').change(function() {
    alert("ok");
  });

  //does not work
  $('#myElement').change(foo);

  //does not work
  $('#myElement').change(foo());
}

Answer 1

All of the following examples should work, if not then you are doing something wrong.

$(function() {
   function foo(e) {
     alert("ok");
   }
   $('#myElement').change(function(e) {
     alert("ok");
   });
   $('#myElement').change(foo);

   //trigger the event like so:
   $('#myElement').change();
});