从选项值中获取值，并在单击使用javascript后使用它从pdo函数执行查询

我想在有人点击选择选项html后显示MySQL的值

但我可以用alert来试试

我看过，但没什么用的

js:

这是我的选项选择：

<select name="tanggal_input" id="test-dropdown" onchange="choice1(this)">
<?php 
    while ($row = $tgal->fetch(PDO::FETCH_ASSOC))
    {
        echo '<option value="'.$row["tgl_input"].'">'.$row["tgl_input"].'</option>';
    }
?>
</select>

<table width="100%" class="table table-striped table-bordered" id="tabeldata">
                <thead>
                    <tr>
                        <th width="30px">No</th>
                        <th>Alternatif</th>
                        <th>Kriteria</th>
                        <th>Nilai</th>
                        <th width="100px">Aksi</th>
                    </tr>
                </thead>

                <tfoot>
                    <tr>
                        <th>No</th>
                        <th>Alternatif</th>
                        <th>Kriteria</th>
                        <th>Nilai</th>
                        <th>Aksi</th>
                    </tr>
                </tfoot>

                <tbody>
        <?php
        $no=1;
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
        ?>
                    <tr>
                        <td><?php echo $no++ ?></td>
                        <td><?php echo $row['nama_alternatif'] ?></td>
                        <td><?php echo $row['nama_kriteria'] ?></td>
                        <td><?php echo $row['nilai_rangking'] ?></td>
                        <td class="text-center">
                            <a href="rangking-ubah.php?ia=<?php echo $row['id_alternatif'] ?>&ik=<?php echo $row['id_kriteria'] ?>" class="btn btn-warning"><span class="glyphicon glyphicon-pencil" aria-hidden="true"></span></a>
                            <a href="rangking-hapus.php?ia=<?php echo $row['id_alternatif'] ?>&ik=<?php echo $row['id_kriteria'] ?>" onclick="return confirm('Yakin ingin menghapus data')" class="btn btn-danger"><span class="glyphicon glyphicon-trash" aria-hidden="true"></span></a>
                        </td>
                    </tr>
        <?php
        }
        ?>
                </tbody>

            </table>

问题：我需要从option select中获取函数PDO的值，并在有人单击option select时在同一页面中执行查询

我该怎么做？有什么例子吗

编辑：我不使用另一个文件来显示结果，就像有人标记duplicate post一样，因为所有结果都是在一个php文件上显示的，如下所示

<?php
include_once 'includes/rangking.inc.php';
$pro = new Rangking($db);
$stmt = $pro->readKhusus();
?>

---some html code-----

<?php
        $no=1;
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
        ?>
                    <tr>
                        <td><?php echo $no++ ?></td>
                        <td><?php echo $row['nama_alternatif'] ?></td>
                        <td><?php echo $row['nama_kriteria'] ?></td>
                        <td><?php echo $row['nilai_rangking'] ?></td>
                        <td class="text-center">
                            <a href="rangking-ubah.php?ia=<?php echo $row['id_alternatif'] ?>&ik=<?php echo $row['id_kriteria'] ?>" class="btn btn-warning"><span class="glyphicon glyphicon-pencil" aria-hidden="true"></span></a>
                            <a href="rangking-hapus.php?ia=<?php echo $row['id_alternatif'] ?>&ik=<?php echo $row['id_kriteria'] ?>" onclick="return confirm('Yakin ingin menghapus data')" class="btn btn-danger"><span class="glyphicon glyphicon-trash" aria-hidden="true"></span></a>
                        </td>
                    </tr>
        <?php
        }
        ?>

---

查看一下@LouysPatriceBesette的可能副本，这样就不可能执行我想要的操作了？因为客户机和服务器是另一个世界--@MattS非常感谢，我先读一下，看一看可能重复的@louyspatricebesette，所以不可能做我想做的事情？因为客户端和服务器是另一个世界--@MattS非常感谢，我先读一下，

function readHasil($a){

        $query = "SELECT sum(bobot_normalisasi) as bbn FROM " . $this->table_name . " WHERE
        id_alternatif='$a' and tgl_input = '2017-05-23' LIMIT 0,1";
        // i need to get tgl_input = "..." from option select value
        $stmt = $this->conn->prepare( $query );
        $stmt->execute();

        return $stmt;
    }

function readHasil($a){

        $query = "SELECT sum(bobot_normalisasi) as bbn FROM " . $this->table_name . " WHERE id_alternatif='$a' and tgl_input = '2017-05-23' LIMIT 0,1";

        $stmt = $this->conn->prepare( $query );
        $stmt->execute();

        return $stmt;
    }

<?php
include_once 'includes/rangking.inc.php';
$pro = new Rangking($db);
$stmt = $pro->readKhusus();
?>

---some html code-----

<?php
        $no=1;
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)){
        ?>
                    <tr>
                        <td><?php echo $no++ ?></td>
                        <td><?php echo $row['nama_alternatif'] ?></td>
                        <td><?php echo $row['nama_kriteria'] ?></td>
                        <td><?php echo $row['nilai_rangking'] ?></td>
                        <td class="text-center">
                            <a href="rangking-ubah.php?ia=<?php echo $row['id_alternatif'] ?>&ik=<?php echo $row['id_kriteria'] ?>" class="btn btn-warning"><span class="glyphicon glyphicon-pencil" aria-hidden="true"></span></a>
                            <a href="rangking-hapus.php?ia=<?php echo $row['id_alternatif'] ?>&ik=<?php echo $row['id_kriteria'] ?>" onclick="return confirm('Yakin ingin menghapus data')" class="btn btn-danger"><span class="glyphicon glyphicon-trash" aria-hidden="true"></span></a>
                        </td>
                    </tr>
        <?php
        }
        ?>