从数据库PHP和jQuery填充选择列表

Question

脚本有问题..我尝试了不同的解决方案而没有解决这个问题。我不擅长Javascript所以它可能在javascript我有一个问题..

我正在尝试使用与先前选择相关的选项填充辅助选择列表。我认为到目前为止我的代码非常简单。

提前致谢！

HTML page.php

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$("#first-choice").change(function() {
  $("#second-choice").load("get.php?choice=" + $("#first-choice").val());
});
</script>

<select id="first-choice">
  <option selected value="base">Please Select</option>
  <option value="1">1</option>
  <option value="2">2</option>
</select>

<br>

<select id="second-choice">
  <option>Please choose from above</option>
</select>

PHP get.php

<?php

    $host = "localhost";
    $user = "user";
    $password = "password";
    $dbname = "dbname";
    $link = mysqli_connect($host, $user, $password, $dbname);

    $choice = mysqli_real_escape_string($_GET['choice']);
    $results = mysqli_query($link, "SELECT * FROM subcategories WHERE parentcat='$choice'") or die(mysqli_error($link));
    while ($row = mysqli_fetch_array($results)) {
        echo "<option>" . $row{'subcat'} . "</option>";
    }
?>