JSFiddle - React, Tailwind, and code Playground

HTML

<table id="mytable">
    <tr><th>checked</th><th>id</th></tr>
    <tr><td><input id="cb1" type="checkbox" name="checker1" value="123" /></td><td>123</td></tr>
    <tr><td><input id="cb1" type="checkbox" name="checker1" value="456" /></td><td>456</td></tr>
    <tr><td><input id="cb1" type="checkbox" name="checker1" value="789" /></td><td>789</td></tr>
</table>

<button id="jqcc">Get values</button>

JavaScript

$('#jqcc').click(function() {
    var checkedValues = $("input:checkbox:checked", "#mytable").map(function() {
        return $(this).val();
    }).get();
    alert(checkedValues.join(','));
});