HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>clear container</title>

  <style>

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

    #results { border: 2px solid #cbd5e1; border-radius: 8px; padding: 12px; min-height: 60px; background: #f8fafc; }

    .item { padding: 6px 8px; margin: 4px 0; background: #dbeafe; border-radius: 4px; }

    .loading { color: #64748b; font-style: italic; }

    button { margin-bottom: 12px; padding: 10px 16px; background: #2563eb; color: #fff; border: none; border-radius: 6px; cursor: pointer; }

  </style>

</head>

<body>

  <button type="button" id="refresh">Refresh results</button>

  <div id="results">

    <div class="item">Stale item A</div>

    <div class="item">Stale item B</div>

  </div>

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

  <script>

    var mockHtml = '<div class="item">Fresh item 1</div><div class="item">Fresh item 2</div><div class="item">Fresh item 3</div>';



    $("#refresh").on("click", function() {

      var $panel = $("#results");

      $panel.empty().append('<p class="loading">Loading…</p>');



      setTimeout(function() {

        $panel.empty().append(mockHtml);

      }, 800);

    });

  </script>

</body>

</html>

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jQuery .empty() — clear container before load (Try It)