■目次スクリプト
var details = document.querySelectorAll('#toc');
details.forEach(function (element) {
var summary = element.querySelector('.toc-btn');
var content = element.querySelector('.toc-menu');
summary.addEventListener('click', function (e) {
e.preventDefault();
if (element.open) {
var openDetails = content.animate({
opacity: [1, 0],
height: [content.offsetHeight + 'px', 0]
}, {
duration: 360,
easing: 'ease-out'
});
openDetails.onfinish = function () {
element.removeAttribute('open');
};
} else {
element.setAttribute('open', 'true');
var _openDetails = content.animate({
opacity: [0, 1],
height: [0, content.offsetHeight + 'px']
}, {
duration: 360,
easing: 'ease-out'
});
}
});
});
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