valid ne valid invalid

form.js

document.addEventListener("DOMContentLoaded", function(event) {
  var body = document.querySelector('body');
  body.classList.remove('is-preview');

  var button = document.querySelector('[type=submit]');
  button.setAttribute('disabled', '');

  function isBlank(value) {
    return value === null;
  }

  function getCheckboxValues() {
    var checkboxesList = document.querySelectorAll('[type=checkbox]:checked');
    var checkboxes = Array.prototype.slice.call(checkboxesList);

    return checkboxes.map(function(item) {
      return item.getAttribute('name');
    });
  }

  function getRadioValue(selector) {
    var radio = document.querySelector(selector + ':checked');
    if (!radio) {
      return null;
    }
    radio.value;
    return radio.value;
  }

  function checkForm() {
    var checkboxes = getCheckboxValues();
    var seeCommercial = getRadioValue('.js-commercial [type=radio]');
    var seeTVCommercial = getRadioValue('.js-tv-commercial [type=radio]');
    var remember = getRadioValue('.js-remember [type=radio]');

    var valid = !isBlank(seeCommercial)
        && !isBlank(seeTVCommercial)
        && !isBlank(remember)
        && checkboxes.length !== 0;

    return {
      checkboxes: checkboxes,
      seeCommercial: seeCommercial,
      seeTVCommercial: seeTVCommercial,
      remember: remember,
      valid: valid
    };
  }

  var comment = document.querySelector('.js-form textarea');
  var form = document.querySelector('.js-form');

  form.addEventListener('click', function(e) {
    var checkFormData = checkForm();

    if (checkFormData.valid) {
      button.removeAttribute('disabled');
    } else {
      button.setAttribute('disabled', '');
    }
  })

  form.addEventListener('submit', function(e) {
    e.preventDefault();

    var checkFormData = checkForm();

    var checkboxes = checkFormData.checkboxes;
    var seeCommercial = checkFormData.seeCommercial;
    var seeTVCommercial = checkFormData.seeTVCommercial;
    var remember = checkFormData.remember;

    var commentText = comment.value;

    if (!checkFormData.valid) {
      console.log('invalid');
    } else {
      var name = 'опрос';
      var email = 'checklist@email.com';
      var data = checkboxes.reduce(function(acc, item) {
        acc[item] = 'true';
        return acc;
      }, {
        seeCommercial: String(seeCommercial),
        seeTVCommercial: String(seeTVCommercial),
        remember: String(remember),
        commentText: String(commentText)
      });

      widget.collectEmail(email, name, data);

      widget.setScreen('polling-success');
    }

  });

  widget.show();
});