JSFiddle - React, Tailwind, and code Playground

HTML

<div class="add">
          <input type="radio" id="add" name="add" checked="checked" />
          <label for="add">add</label>
          <select size="6" multiple="multiple" id="add" 
          </select>
        </div>

JavaScript

$(document).ready(function() {
    $('input[name="add"]').click(function() {
        $('select[name^="add"]').attr('disabled', 'disabled');
        $('#' + $(this).attr('id') + 'Select').removeAttr('disabled');
    });
});