Nacitanie dat z databaze cez ajax

function nahrajPolia(idPola){
$.ajax({
type:'POST',
url:'novy-produkt.php/novaSkupina',
dataType:'json',
data:{value: idPola},
success: function(data){
$('#polia').append(data);
}
}); //end ajax method
}// end function

public function novaSkupina($id=42){
$this->polia = $this->model->nacitajPolia($id);
while(list($skupiny) = $this->polia->fetch_array(MYSQLI_NUM)){
...
}

$('#volitelenePoliaSelect').change(function(){
var idPola = this.value;
$.post('loadData/loadData.php', {volitelnePole: idPola}, function(data){
$('#polia').html(data);                                                              
});
});