ho provato a fare così, ma non va


codice:
$('#datepicker').datepicker({
		onSelect: function(dateText) { 
			var idElement = document.getElementById("id_search");
			idElement.value = dateText;
			trigga();
		}	 
	});

function trigga(){$('#id_search').trigger(cerca())}
function cerca(){
	$("#id_search").quicksearch("table tbody tr", {
		noResults: '#noresults',
		stripeRows: ['odd', 'even'],
		bind: 'keyup'
	});
}