HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>blur trim</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 360px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    #name { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; }
    #log { margin-top: 12px; padding: 10px; background: #f0fdf4; border-radius: 6px; color: #166534; font-family: monospace; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <label for="name">Full name</label>
  <input type="text" id="name" placeholder="  Jane Doe  ">
  <div id="log">Type a name with extra spaces, then tab away.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#name").on("blur", function() {
      var trimmed = $(this).val().trim();
      $(this).val(trimmed);
      $("#log").text("Saved name: " + trimmed);
    });
  </script>
</body>
</html>

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jQuery blur event — trim whitespace (Try It)