JSFiddle - React, Tailwind, and code Playground

by Константин Дралюк

HTML

<input type="checkbox" value="check" />
<input type="submit" value="BTN" disabled="disabled" />

JavaScript

$('input[type="checkbox"]').on('click', function() {
    if($('input[type="checkbox"]').prop('checked')) {
        $('input[type="submit"]').removeAttr('disabled');
    } else {
        $('input[type="submit"]').attr('disabled', 'disabled');
    };
});