JSFiddle - React, Tailwind, and code Playground

by Андрей Хамедов

JavaScript

var CHECKBOX_SELECTOR = '.checkbox';
    var SUBMIT_BUTTON_SELECTOR = '#form-submit';
    var checkBoxes = document.querySelectorAll(CHECKBOX_SELECTOR);
    checkBoxes.forEach(checkBox => checkBox.addEventListener('click', checkFilledCheckBoxes));

    function checkFilledCheckBoxes() {
        var isSelected = !!Array.prototype.filter.call(checkBoxes, checkbox => checkbox.checked).length;
        document.querySelector(SUBMIT_BUTTON_SELECTOR).disabled = !isSelected;
    }