Allow ony letters and digits in a field

An example showing how to allow ony letters and digits in a field using Tizen 2.3. 
<!DOCTYPE html>
<html>
<body>
  <input type="text" id="field">
  <script>
  var field = document.getElementById('field');
  field.addEventListener('keydown', function(e) {
    if (
      ((e.keyCode < 65 || e.keyCode > 90) && (e.keyCode < 48 || e.keyCode > 57)) ||
      (e.keyCode >= 48 && e.keyCode <= 57 && e.shiftKey === true)
    ) {
      e.preventDefault();
    }
  });
  </script>
</body>
</html>
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