ajax hakkında yardımcı olabilirmisiniz ?

<div class="row">
  <div class="col-md-12 col-sm-12 col-xs-12">
      <div class="card portlets portlets-info">
        <div class="card-header">
            <i class="fa fa-terminal"></i> &nbsp;KOMUT KONSOLU
        </div>
        <form method="POST" action="<?=$page->CreatePageLink($cur_page)?>">
            <table class="table table-striped" cellpadding="10" style="width:100%;"> 
                <tr>
                    <td colspan="2" style="padding:0;"><textarea class="form-control text-info" style="border-radius:0px; width: 100%;height: 350px !important;background-color:black;resize:none;" readonly="true"><?=$icerik?></textarea></td>
                </tr>
                <tr>
                    <td align="left"><input class="form-control" type="text" name="cmdd" placeholder="Buraya komut girebilirsiniz"></td>
                    <td align="right"><button class="btn btn-info btn-block" name="sbmt">Uygula!</button></td>
                </tr>
            </table>
        </form>
    </div>
  </div>
</div>

<?php
    $ssh2 = new ogcp_ssh2();
    if($ssh2->ConnectwAuth($serverinfo["MachIP"],(int)$serverinfo["MachPort"],$serverinfo["MachUser"],$serverinfo["MachPass"])) {
        $icerik = stream_get_contents($ssh2->Exec('cd '.$serverinfo["ServerPath"].'; tail -15 screenlog.0'));
    } else {
        $icerik = "";
    }
    if(isset($_POST["sbmt"], $_POST["cmdd"])) {
        $_POST["cmdd"] = strip_tags(htmlspecialchars(addslashes($_POST["cmdd"])));
        $durum = false;
        $bad_commands = array(
        "screen","-dr","-X","quit","shutdown","exit",";","sv_downloadurl","hostname","rcon_password","sv_contact","sv_maxrate","sv_minrate","sv_maxupdaterate","sv_minupdaterate","sys_ticrate","fps_max","fps_modem"
        );
        for($i=0; $i < count($bad_commands); $i++) {
            if(strpos($_POST["cmdd"],$bad_commands[$i]) !== false) { $durum = true; break; }
        }
        $komut = "screen -S {$serverinfo["Screen"]} -X -p0 eval \"stuff '{$_POST["cmdd"]}'^m\"";
        if(!$durum) {
            $shell = @$ssh2->Exec($komut);
        } else {
            $shell = false;
        }
        if($shell != false) {
            print('<div class="alert success"><span class="hide">×</span><strong>Başarılı!</strong> '.$_POST["cmdd"].' komutu gonderildi!</div>');
            $icerik = stream_get_contents(@$ssh2->Exec('cd '.$serverinfo["ServerPath"].'; tail -15 screenlog.0'));
        } else {
            print('<div class="alert error"><span class="hide">×</span><strong>Başarısız!</strong> '.$_POST["cmdd"].' komutu gonderilemedi!</div>');
        }
    }
?>

 $("form").submit(function (e) {
            $.ajax({
                type: $(this).attr('method'),
                url: $(this).attr('action'),
                data: $(this).serialize(),
                success: function(response){
                    $("#alertMessage").html(response)
                }
            })
        });