For those coming to this question because they want to know how to bind to the event that happens when someone clicks on an input box, then this is useful:
$('input.your-input-box-class').focus(function(e){
// do something
});
For those who want to use datepicker like the original question asks, then remember that jQuery UI abstracts away from these types of details. So just use the widgets like they were meant to be used. In this case, create the datepickers for all your input boxes that have a certain class (say date maybe) when the DOM is done loading:
$(document).ready(function(){
$('input.datepicker').datepicker({ /*... pass options here ...*/ });
});
And for options, you read the documentation, they include handling all the events you need:
http://api.jqueryui.com/datepicker/
$('.input-group .date')should be:$('.input-group.date')