JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div">
<table>
    <tr id="tr_id">
        <td><input type=button value="Go" id="btn_id" /></td>
    </tr>
</table>
</div>

JavaScript

$("#btn_id").click(function() {
    //alert(btn_id.id);
    alert($(this).attr("id"))
    var btnId = $(this).attr("id");  
    //alert($(btnId).closest("tr").id);
     alert($(this).closest("tr").attr("id"));
    return false;  
})