Set focus on Jquery datepicker on datepicker close, without opening datepicker

问题

I am trying to set focus on input of datepicker, after datepicker closes, but without opening it again.

Does anyone have a solution to this wicked request?

I have tried something like this, but finally I cant get it to work for IE9.

$.datepicker.setDefaults({
            onClose: function(dateText, inst) { 
               showDatepicker = false;

               if (detectIE()) {
                 $(this).focus();
               } else {
                 setTimeout(function() {
                   $(this).focus();
                 })
               } 
            },
            beforeShow: function() {
                if (!showDatepicker) {
                    showDatepicker = true;
                    return false;
                }
            }
        });

来源：https://stackoverflow.com/questions/33239135/set-focus-on-jquery-datepicker-on-datepicker-close-without-opening-datepicker