JSFiddle - React, Tailwind, and code Playground

HTML

<form id="" action="" method="post">
    <input type="text" data-default="Carl" value="Carl" name="firstname" id="firstname" />
    <input type="text" data-default="Johnson" value="Johnson" name="lastname" id="lasttname" />
    <br />
    <br />
    <input id="female" type="radio" value="female" name="sex" data-default="0" />Female
    <br />
    <input id="male" type="radio" value="male" name="sex" data-default="0" />Male
    <br />
    <br />
    <select id="country-list" name="countries" data-default="xx">
        <option value="xx" selected="">Worldwide</option>
        <option value="in">India</option>
        <option value="il">Israel</option>
        <option value="ru">Russia</option>
        <option value="us">United States</option>
    </select>
    <br />
    <br />
    <button id="submit-data" disabled="" type="submit">Save changes</button>
</form>

JavaScript

var button = $('#submit-data');
$('form :input').not(button).bind('keyup change', function () {
    // get all that inputs that has changed
    var changed = $('form :input').not(button).filter(function () {
        if (this.type == 'radio' || this.type == 'checkbox') {
            return this.checked != $(this).data('default');
        } else {
            return this.value != $(this).data('default');
        }
    });
    // disable if none have changed - else enable if at least one has changed
    $('#submit-data').prop('disabled', !changed.length);
});