Ciao,
vorrei fare in modo che la mia DropDownList aggiornasse i dati al click sull'opzione e non dover prima scegliere e poi cliccare sul tasto conferma.

codice:
if(isset($_POST['filtro'])){
        if($_POST['value'] == 3){
            $_SESSION['queryFiltro'] = 3;            
            generic::redirect("holidayManager.php",0);
        }elseif($_POST['value'] == 2){
            $_SESSION['queryFiltro'] = 2;
            generic::redirect("holidayManager.php",0);
        }elseif($_POST['value'] == 1){
            $_SESSION['queryFiltro'] = 1;
            generic::redirect("holidayManager.php",0);
        }elseif($_POST['value'] == 4){
            $_SESSION['queryFiltro'] = 4;
            generic::redirect("holidayManager.php",0);
        }elseif($_POST['value'] == 5){
            $_SESSION['queryFiltro'] = 5;
            generic::redirect("holidayManager.php",0);
        }
    }

if($_SESSION['queryFiltro'] == 4) {
    echo       '<form method="POST">
                <select name="value" name="filtro1">
                <option value="3">'.$output[373].'</option>
                <option value="2">'.$output[374].'</option>
                <option value="5">'.$output[375].'</option>
                <option value="1">'.$output[376].'</option>
                <option value="4" selected="selected" >'.$output[377].'</option>
                </select>
                <input type="submit" value="'.$output[378].'" name="filtro">
                </form>';
    $query = "SELECT * FROM vacanza WHERE accettata = 0 order by dataPrenotazione desc,  periodo desc";
    }
    elseif($_SESSION['queryFiltro'] == 1) {
    echo       '<form method="POST">
                <select name="value" name="filtro1">
                <option value="3">'.$output[373].'</option>
                <option value="2">'.$output[374].'</option>
                <option value="5">'.$output[375].'</option>
                <option value="1" selected="selected" >'.$output[376].'</option>
                <option value="4">'.$output[377].'</option>
                </select>
                <input type="submit" value="'.$output[378].'" name="filtro">
                </form>';
    $query = "SELECT * FROM vacanza WHERE accettata = 1 order by dataPrenotazione desc,  periodo desc";
    }
.... ecc