JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <th>fsdfasdf</th>
        <th>fsdfasdf</th>
    <thead/>
    <tbody>
        <tr>
            <td><input type="checkbox" onclick="fncTest(this);" /> </td>
            <td>
                <input type='hidden' name='item[]' value="1"/>                
            </td>
        <tr>
        <tr>
            <td><input type="checkbox" onclick="fncTest(this);" /> </td>
            <td>
                <input type='hidden' name='item[]' value="2"/>
            </td>
        <tr>
    </tbody>
    </div>
</form>

JavaScript

function fncTest(element){
    
    parent = $(element).parent().parent();
    alert($(parent).find('input[name="item[]"]').val());
}