let result = []; document.addEventListener('click', function(e) { if (!e.target.classList.contains('dance-cell')) return; let value = e.target.innerText; e.target.classList.toggle('active'); if (result.includes(value)) { result = result.filter(v => v !== value); } else { result.push(value); } document.getElementById('dance-result').value = result.join(', '); });