haven't been managed to hide the list items by changing the checkbox

const form = document.getElementById('registrar');
const input = form.querySelector('input');

const mainDiv = document.querySelector('.main');
const ul = document.getElementById('invitedList');

const div = document.createElement('div');
const filterLabel = document.createElement('label');
const filterCheckbox = document.createElement('input');

filterLabel.textContent = "Hide those who haven't responded";
filterCheckbox.type = 'checkbox';
div.appendChild(filterLabel);
div.appendChild(filterCheckbox);
mainDiv.insertBefore(div, ul);

filterCheckbox.addEventListener('change', (e) => {
  const isChecked = e.target.checked;
  const lis = ul.children;
  if(isChecked) {
    for (let i = 0; i < lis.length; i += 1) {
      let li = lis[i];
      if (li.className === 'responded') {
        li.style.display === '';
      } else {
        li.style.display === 'none';
      }
    }
  } else {
    for (let i = 0; i < lis.length; i += 1) {
      let li = lis[i];
      li.style.display === '';
    }  
  }
});


function ctrateLI(text) {
  const li = document.createElement('li');
  const span = document.createElement('span');
  span.textContent = text;
  li.appendChild(span);  
  const label = document.createElement('label');
  label.textContent = 'Confirmed';
  const checkbox = document.createElement('input');
  checkbox.type = 'checkbox';
  label.appendChild(checkbox);
  li.appendChild(label);

  const editButton = document.createElement('button');
  editButton.textContent = 'edit';
  li.appendChild(editButton);

  const removeButton = document.createElement('button');
  removeButton.textContent = 'remove';
  li.appendChild(removeButton);
  return li; // without return function javascript will return 'undefined' //
}


form.addEventListener('submit', (e) => {
  e.preventDefault();
  const text = input.value;
  input.value = '';

  const li = ctrateLI(text);
  ul.appendChild(li);
});


ul.addEventListener('change', (e) => {
//  console.log(e.target.checked);
  const checkbox = e.target;
  const checked = checkbox.checked;
  const listItem = checkbox.parentNode.parentNode;

  if (checked) {
    listItem.className = 'responded'
  }
  else {
    listItem.className = ''
  }
});


ul.addEventListener('click', (e) => {

  if (e.target.tagName === 'BUTTON') {
    const button = e.target;
    const li = button.parentNode;
    const ul = li.parentNode; 
    if (button.textContent === 'remove') {
    ul.removeChild(li);
    } else if (button.textContent === 'edit') {
      const span = li.firstElementChild;
      const input = document.createElement('input')
      input.type = 'text';
      input.value = span.textContent;
      li.insertBefore(input, span);
      li.removeChild(span);
      button.textContent = 'save';

      } else if (button.textContent === 'save') {
      const input = li.firstElementChild;
      const span = document.createElement('span')
      span.textContent = input.value;
      li.insertBefore(span, input);
      li.removeChild(input);
      button.textContent = 'edit';
    }
  }
});