php - 显示数据库中的数据而不刷新(Javascript)

Question

我正在尝试让以下代码工作，当单击以下链接时，该代码应该显示数据库中的数据:(无需刷新页面)

<a id="bugatti_link" href="#" database_id="Bugatti">Bugatti</a> 

不幸的是，它不起作用，它没有显示任何内容，也没有给出错误。

index.php =

<a id="bugatti_link" href="#" database_id="Bugatti">Bugatti</a>

<script>
$("#bugatti_link").click(load_ajax);

function load_ajax(e) {
    var link = $(e.target); 
    var vehicle_database_id = link.attr("database_id");
    var ajax_params = {"brand": vehicle_database_id};
    $.getJSON("query2.php", ajax_params, success_handler)
}

function success_handler(data) {
    //data variable contains whatever data the server returned from the database.
    //Do some manipulation of the html document here. No page refresh will happen.
}
</script>

query2.php =

<?php
$host = "xx";
$user = "xx";
$db   = "xx";
$pass = "xx";

$pdo = new PDO("mysql:host=" . $host . ";dbname=" . $db, $user, $pass);

$rows = array();
if(isset($_GET['brand'])) {
    $stmt = $pdo->prepare("SELECT brand FROM cars WHERE brand = ? ");
    $stmt->execute(array($_GET['brand']));
    $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
}
echo json_encode($rows);
?>

Answer 1

您将 json 数据传递给“success_handler”，但数据未在该函数内处理