67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
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class ChapterToggle {
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constructor(elem) {
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this.elem = elem;
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this.isOpen = elem.classList.contains('open');
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elem.addEventListener('click', this.click.bind(this));
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}
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open() {
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let list = this.elem.parentNode.querySelector('.inset-list');
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this.elem.classList.add('open');
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list.style.display = 'block';
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list.style.height = '';
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let height = list.getBoundingClientRect().height;
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list.style.height = '0px';
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list.style.overflow = 'hidden';
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list.style.transition = 'height ease-in-out 240ms';
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let transitionEndBound = onTransitionEnd.bind(this);
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function onTransitionEnd() {
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list.style.overflow = '';
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list.style.height = '';
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list.style.transition = '';
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list.removeEventListener('transitionend', transitionEndBound);
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}
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setTimeout(() => {
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list.style.height = `${height}px`;
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list.addEventListener('transitionend', transitionEndBound)
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}, 1);
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}
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close() {
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let list = this.elem.parentNode.querySelector('.inset-list');
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this.elem.classList.remove('open');
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list.style.display = 'block';
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list.style.height = list.getBoundingClientRect().height + 'px';
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list.style.overflow = 'hidden';
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list.style.transition = 'height ease-in-out 240ms';
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let transitionEndBound = onTransitionEnd.bind(this);
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function onTransitionEnd() {
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list.style.overflow = '';
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list.style.height = '';
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list.style.transition = '';
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list.style.display = 'none';
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list.removeEventListener('transitionend', transitionEndBound);
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}
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setTimeout(() => {
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list.style.height = `0px`;
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list.addEventListener('transitionend', transitionEndBound)
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}, 1);
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}
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click(event) {
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event.preventDefault();
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this.isOpen ? this.close() : this.open();
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this.isOpen = !this.isOpen;
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}
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}
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module.exports = ChapterToggle;
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