JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tbody>
    <tr><td>test</td></tr>
    <tr><td>test</td></tr>
    <tr><td>test</td></tr>
    </tbody>
</table>

JavaScript

$("td").click(function() {
   alert($(this).closest("tr")[0].rowIndex); 
});