find closest data attribute value

by karin

HTML

<table>
    <tr data-BBid='22'>
        <td>1</td>
        <td>2</td>
        <td>
            <button id='editReason'>edit</button>
        </td>
    </tr>
</table>

JavaScript

$('#editReason').on('click', function () {
     var rowTag = $(this).closest('tr').attr("data-bbid");
     alert(rowTag);

 });