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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
<div class="col offset-3">
  <div class="d-flex">
    <button class="mt-4 btn btn-primary" data-toggle="modal" data-target="#deleteModal" data-id="42">delete record 1</button>
    <button class="mt-4 btn btn-primary" data-toggle="modal" data-target="#deleteModal" data-id="123">delete record 2</button>
  </div>
  <h5 class="mt-4 text-danger" id="testOutput"></h5>
  <h5 class="text-danger" id="testOutput2"></h5>
</div>
<div class="modal fade" id="deleteModal" tabindex="-1" role="dialog" aria-labelledby="deleteModalTitle" aria-hidden="true">
    <div class="modal-dialog modal-dialog-centered" role="document">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title" id="deleteModalTitle">Confirm delete</h5>
            <button type="button" class="close" data-dismiss="modal">
              <span aria-hidden="true">&times;</span>
            </button>
          </div>
          <div class="modal-body">
            <p>Delete record <span class="font-weight-bold text-danger" id='deleteId'></span>?</p>
            <input type='hidden' id='deleteIdInput' />
          </div>
          <div class="modal-footer">
            <button class="btn btn-primary" type="button" id="confirmDeleteBtn" data-dismiss="modal">Yes</button>
            <button class="btn btn-outline-secondary" id="cancelDeleteBtn"type="button" data-dismiss="modal">Cancel</button>
          </div>
        </div>
    </div>
</div>
  <script>
    $(document).ready(function () {
  $('#deleteModal').on('show.bs.modal', function (e) {
      $('#testOutput,#testOutput2').text('');
       var id = $(e.relatedTarget).data('id'); 
      $('#deleteId').text(id || 'id retrieval failed');
      $('#deleteIdInput').val(id);
  });
  
  $('#deleteModal').on('hide.bs.modal', function (e) {
      var id = $('#deleteIdInput').val(); //does not work
      $('#testOutput2').text(id || '"hidden.bs.modal" id retrieval failed');
  });  
  
  $('#confirmDeleteBtn').click(function (e) {
    var id = $(e.relatedTarget).data('id');  //does not work
    //var id = $(this).closest('.modal').data('id'); //doesnt work neither
    $('#testOutput').text(id || '"btn.close .modal" id retrieval failed');
  });
});
  </script>
</body>
</html>
Output

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