Call 'getChecked' method to detect if some rows are checked.
var checkedRows = $('#dl').datalist('getChecked');
if (checkedRows.length){
$.mobile.go('#p3');
}
Actually this ended up working quite well. Thank you for the help ;-)
$('#menuBtnSendWrap').bind('click', function(){
var checkedRows = $('#dlWraps').datalist('getChecked');
if (checkedRows.length){
$.mobile.go('#p3');
}else{
$('#dlgAlertMsg').html("Choose a wrap!");
$('#dlgAlert').dialog('open').dialog('center');
}
});