Get the Height and Width of a jQuery UI Datepicker
$('#loading').height($('.ui-datepicker-calendar').height() + $('.ui-datepicker-header').height())

$('#loading').height($('.ui-datepicker-inline.ui-datepicker.ui-widget.ui-widget-content.ui-helper-clearfix.ui-corner-all').height())

$('#loading').height($('.ui-datepicker-calendar').outerHeight(false) + $('.ui-datepicker-header').outerHeight(false))

$('#loading').height($('.ui-datepicker-inline.ui-datepicker.ui-widget.ui-widget-content.ui-helper-clearfix.ui-corner-all').outerHeight(false))

$('#loading').height($('.ui-datepicker-inline').height());