Jquery – Select optgroup in select

Question

I have a select with 2 optgroups. Is there a way to call an function only if an option from the first optgroup is selected and call another function if an option from the se

Answer 1

$('#selectID').change(function(){
  var $option = $('option:selected', this); // get selected option
  var optGroup = $option.closest('optgroup').index(); // get which optgroup
  if(optGroup == 0){
    // first
  }
  else if(optGroup == 1){
    // second
  }
  else{
    // not first or second
  }
});