JSFiddle - React, Tailwind, and code Playground

by dorathoto

HTML

<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/additional-methods.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.js"></script>
<form action="#" method="post" id="Form">


<input type="checkbox" id="L3chk" name="L3chk" value="true"  />
<select id="RadioId" class="form-control" >
<option disabled selected>--- Selecione ---</option>
<option value="1">Opc 1</option>
<option value="2">Opc 2</option>
</select>

<button type="submit" class="btn btn-danger">Enviar</button>
</form>

JavaScript

$(document).ready(function () {
            $("#Form").validate({
                rules: {
                    RadioId: { required: "#L3chk:checked" }
                }
            })
        });