Proper way to add a callback to jQuery DatePicker

Question

DatePicker has an internal function, _adjustDate(), which I'd like to add a callback after.

Current Method

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This is how I'm currently doing this. Basically, just replacing the function defintion with itself, plus the new operations. This effects all datepickers, which I'm not sure is desired, either.

$(function(){

   var old = $.datepicker._adjustdate;

   $.datepicker._adjustDate = function(){
      old.apply(this, arguments);

      // custom callback here     
      console.log('callback');
   };

});

_adjustDate is what's called during the next/prev month clicks. The function takes three parameters. I'm curious if there's a better way to add the callback.

Expected Result

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I'd like to have the end result look like this; where afterAjustDate is the callback handle:

$('#datepicker').datepicker({ 
       showButtonPanel: true
     , afterAdjustDate: function(){ $(this).find('foo').addClass('bar'); }
});

FYI

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onChangeMonthYear is not an acceptable event alternative, neither are the live()/delegate() (don't work in IE) binding options.

This comes from the need of applying classes/manipulating elements after the month is selected. Changing the month recreates elements in the calendar; when this is performed jQueryUI is not smart enough to inherit the class changes. Thus, I need a callback after changing the date.

Answer 1

There is an onSelect option that you can use to pass a callback function to the datepicker. It sounds like this might be a built-in solution to what you need.

$('.datepicker').datepicker({
  onSelect: function(selectedDate) {
    // custom callback logic here
    alert(selectedDate);
  }
});