使用AJAX、PHP和Javascript自动填充输入文本框

我有一个选择框与从数据库(phpmyadmin)的数据生成的选项，数据库看起来像这样:

Columns: locationID - address - postalcode - place

在选择框之后，我有一些输入字段，首先是一些标准的占位符。

这个想法是，如果我选择一个选项，字段将从数据库生成和填充(除了contactperson字段，这将保持手动)..

对于这个，我尝试使用AJAX。

我已经写好了:

test.php :

<?php
    //Query the database for the results we want
    $query1 = $conn->query("SELECT * FROM deliveryaddress");
    //Create an array of objects for each returned row
    while($locationArray[] = $query1->fetch_object());
    //Remove the blank entry at end of array
    array_pop($locationArray);
?>
<script>
    $(document).on("change","#select-box").function(){
        var id = $(this).val();
        $.ajax({
            url      : "locationAjax.php",
            data     : {"id":id},
            type     : "POST",
            dataType : "HTML",
            success  : function(data){
                // here you can write code to asign the values to text boxes.
                $(".wrapperDiv").html(data); 
            }
        });
    });
</script>
<div class="wrapperDiv">
    <label for="locationLabel">Locatie</label>
    <select name="locations" id="locationSelectBox" >
        <option>Locatie</option>
        <?php foreach ($locationArray as $option) : ?>
            <option value="<?php echo $option->locationID; ?>"><?php echo $option->locationID; ?></option>
        <?php endforeach; ?>
    </select>
    <label for="address" style="float:left;">Straat/No</label>
    <input type="text" name="address" id="address" placeholder="Straatnaam en nummer" />
    <label for="postalCode">Postcode</label>
    <input type="text" name="postalCode" id="postalCode" placeholder="Postcode" />
    <label for="place">Plaats</label>
    <input type="text" name="place" id="place" placeholder="Plaats" />
    <label for="contactPerson">Contact</label>
    <input type="text" name="contactPerson" id="contactPerson" placeholder="Contactpersoon" />
</div>

locationAjax.php :

<?php
    require_once('dbconnection.php'); 
    $locationID = $_POST['id']; 
    $sql = "SELECT * FROM deliveryaddress where id = $locationID"; 
    $result = mysqli_query($conn, $sql); 
?> 
<?php while ($row = mysqli_fetch_assoc($result)) { ?> 
    <input type="text" name="name" value="<?= $row['address'] ?>" /> 
    <input type="text" name="name" value="<?= $row['postalcode'] ?>" /> 
    <input type="text" name="name" value="<?= $row['place'] ?>" /> 
} 
?>