BookStack/resources/assets/js/components/chapter-toggle.js

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