JSFiddle - React, Tailwind, and code Playground

by alexdickson

HTML

<form>
<input type="checkbox" class="check" />

<input type="checkbox" class="check" />

<input type="checkbox" class="check" />

<input type="checkbox" class="check" />

<input type="submit" value="submit" id="bla" disabled="disabled" />
</form>

JavaScript

var checks = $(':checkbox.check');

checks.change(function() {
    $('#bla').attr('disabled', ! checks.filter(':checked').length);
});