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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>$.post() serialize</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    label { display: block; margin-bottom: 8px; font-size: 14px; }

    input, textarea { width: 100%; padding: 6px 8px; margin-top: 2px; box-sizing: border-box; }

    button { margin-top: 12px; padding: 8px 14px; cursor: pointer; background: #2563eb; color: #fff; border: none; border-radius: 6px; }

    .log { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 13px; word-break: break-all; }

  </style>

</head>

<body>

  <form id="contact-form">

    <label>Title <input type="text" name="title" value="Form post"></label>

    <label>Body <textarea name="body">Sent via .serialize()</textarea></label>

    <input type="hidden" name="userId" value="1">

  </form>

  <button type="button" id="submit-form">$.post(serialize())</button>

  <div class="log" id="status">Edit fields and submit.</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#submit-form").on("click", function() {

      var payload = $("#contact-form").serialize();

      $("#status").text("Sending: " + payload);

      $.post("https://jsonplaceholder.typicode.com/posts", payload, function(data) {

        $("#status").text("Saved! id=" + data.id + " — sent: " + payload);

      }, "json");

    });

  </script>

</body>

</html>

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jQuery.post() — form serialize (Try It)