var headers = document.querySelectorAll('.tabSectionHeader');
headers.forEach(function (header) {
    header.addEventListener('click', function () {
        var clickedParent = header.parentNode;
        headers.forEach(function (otherHeader) {
            var otherParent = otherHeader.parentNode;
            if (otherParent !== clickedParent) {
                otherParent.classList.remove('chartActiveOpenClose');
            }
        });
        clickedParent.classList.toggle('chartActiveOpenClose');
    });
});