HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>AJAX submit</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 440px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    input, textarea { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; margin-bottom: 12px; }
    button { padding: 10px 16px; background: #6366f1; color: #fff; border: none; border-radius: 6px; cursor: pointer; }
    #result { margin-top: 12px; padding: 10px; background: #f0fdf4; border-radius: 6px; color: #166534; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <form id="contact" action="https://httpbin.org/post" method="POST">
    <label for="msg">Message</label>
    <textarea id="msg" name="message" rows="3" placeholder="Hello!"></textarea>
    <button type="submit">Send</button>
  </form>
  <div id="result">Submit to see AJAX response (demo uses httpbin.org).</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#contact").on("submit", function(event) {
      event.preventDefault();
      var $form = $(this);
      $("#result").text("Sending...");
      $.ajax({
        url: $form.attr("action"),
        method: $form.attr("method") || "POST",
        data: $form.serialize(),
        success: function(response) {
          var preview = typeof response === "object" ? response.form.message : response;
          $("#result").text("Sent! Server got: " + preview);
        },
        error: function() {
          $("#result").text("Request failed — check network or CORS.");
        }
      });
    });
  </script>
</body>
</html>

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jQuery submit event — AJAX with serialize (Try It)