JQuery datepicker on dynamic elements

app.js

$(function() {
		//input calender
		$(".app_datepicker").on('focus', function(){
			var $this = $(this);
			if(!$this.data('datepicker')) {
				$this.removeClass("hasDatepicker");
				$this.datepicker();
				$this.datepicker("show");
			}
		});
});