capture click event on calender popup

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ASP.NET

jQuery

i have calander image, on click of which div is popup which has table.

i want to check user has selected date or not.

I tried following, but its not working

$('.ajax__calendar_days > table > tbody').find('tr').each(function(){
                $(this).find('td').click(function(){
                    alert('hi');
                });
            });

may i know where i'm going wrong

or is there any other way to check the text in the textbox(that holds date) has changed using jquery.
even i tried for this following, but was not working

$('#Tbl_Selection').find('tr').each(function(){
$(this).find('input').change(function(){
                    $('#ctl00_cphPage_btnExpExcel').prop('disabled', true);
                    $('#ctl00_cphPage_hdExpExcel').val('1');
                });
});

Any help??
thanks in advance