JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://fronteed.com/iCheck/icheck.js?v=1.0.1"></script>
<link rel="stylesheet" href="http://fronteed.com/iCheck/skins/square/orange.css">
<div class="adv_filter">
    <li>
        <input type="radio" name="letter_type" data-custom="Text" value="0"> Zero</li>
    </li>
        <li>
            <input type="radio" name="letter_type" data-custom="Text" value="1"> One</li>
    </li>
</div>
<!-- iCheck output format
<div class="adv_filter">
    <li>
        <div class="iradio_square-orange checked" aria-checked="true" aria-disabled="false" style="position: relative;"><input type="radio" name="letter_type" data-custom="Text" value="0" style="position: absolute; top: -20%; left: -20%; display: block; width: 140%; height: 140%; margin: 0px; padding: 0px; border: 0px; opacity: 0; background: rgb(255, 255, 255);"><ins class="iCheck-helper" style="position: absolute; top: -20%; left: -20%; display: block; width: 140%; height: 140%; margin: 0px; padding: 0px; border: 0px; opacity: 0; background: rgb(255, 255, 255);"></ins></div> Text</li>
    
        <li>
            <div class="iradio_square-orange" aria-checked="false" aria-disabled="false" style="position: relative;"><input type="radio" name="letter_type" data-custom="Text" value="0" style="position: absolute; top: -20%; left: -20%; display: block; width: 140%; height: 140%; margin: 0px; padding: 0px; border: 0px; opacity: 0; background: rgb(255, 255, 255);"><ins class="iCheck-helper" style="position: absolute; top: -20%; left: -20%; display: block; width: 140%; height: 140%; margin: 0px; padding: 0px; border: 0px; opacity: 0; background: rgb(255, 255, 255);"></ins></div> Text</li>
    
</div> -->

CSS

li {
 list-style-type: none;
}

JavaScript

$(document).ready(function () {
    $('input').iCheck({
        checkboxClass: 'icheckbox_square-orange',
        radioClass: 'iradio_square-orange',
        increaseArea: '20%' // optional
    });
    
    $('input').on('ifChecked', function(event){
      alert($(this).val());
    });
});