JSFiddle - React, Tailwind, and code Playground

HTML

<form id='myform' method='post' action=''>
    <table id='mytable'>
        <tr>
            <td></td>
            <td></td>
            <td>
                <input type='checkbox' name='mycheckbox' class='mycheckbox' />
                 <input type='checkbox' name='mycheckbox2' class='mycheckbox'/>
            </td>
            <tr>
                <tr>
                    <td class="Total">Total Checked</td>
                    <td class="TotalCount"></td>
                </tr>
    </table>
</form>

JavaScript

$(".mycheckbox").change(function () {

    $(".TotalCount").text($(".mycheckbox:checked").length);

})