HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>$.post() jqXHR chain</title>

  <style>

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

    button { margin-right: 8px; padding: 8px 14px; cursor: pointer; border: none; border-radius: 6px; color: #fff; }

    #ok { background: #16a34a; }

    #bad { background: #dc2626; }

    .log { margin-top: 14px; padding: 12px; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; font-size: 14px; }

    .log li { margin: 4px 0; }

  </style>

</head>

<body>

  <button type="button" id="ok">Valid POST</button>

  <button type="button" id="bad">Invalid URL</button>

  <ul class="log" id="log"><li>Click a button.</li></ul>

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

  <script>

    function postData(url) {

      $("#log").empty();

      return $.post(url, { title: "Test", body: "Chain", userId: 1 })

        .done(function(data) { $("#log").append("<li style='color:green'>done: id " + data.id + "</li>"); })

        .fail(function(xhr, status) { $("#log").append("<li style='color:red'>fail: " + status + " (HTTP " + xhr.status + ")</li>"); })

        .always(function() { $("#log").append("<li>always: finished</li>"); });

    }

    $("#ok").on("click", function() { postData("https://jsonplaceholder.typicode.com/posts"); });

    $("#bad").on("click", function() { postData("https://jsonplaceholder.typicode.com/this-does-not-exist"); });

  </script>

</body>

</html>

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jQuery.post() — done/fail/always chain (Try It)