Simple datepicker validation

Question

Can someone help me write a function for showing a line of text (preferably by showing a css class) for a jquery datepicker after someone has clicked a date?

The not

Answer 1

U can use onClose in datepicker

$(function() {
  $( "#date" ).datepicker({ 
  dateFormat: "dd/mm/yy",
  onClose: function() {
        valid();
    }
  });
});

jsfiddle - example