JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>John</td>
        <td>42</td>
    </tr><tr>
        <td>Alice</td>
        <td>34</td>
    </tr>
</table>

CSS

.selected {
    background-color: #ff0;
}

JavaScript

$('tr').click(function() {
    $('tr').removeClass('selected');
    $(this).addClass('selected');
    
    var td = $(this).children('td');
    for (var i = 0; i < td.length; ++i) {
        alert(i + ': ' + td[i].innerText);
    }
});