BookStack/resources/assets/js/components/overlay.js

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JavaScript
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class Overlay {
constructor(elem) {
this.container = elem;
elem.addEventListener('click', event => {
if (event.target === elem) return this.hide();
});
let closeButtons = elem.querySelectorAll('.overlay-close');
for (let i=0; i < closeButtons.length; i++) {
closeButtons[i].addEventListener('click', this.hide.bind(this));
}
}
toggle(show = true) {
let start = Date.now();
let duration = 240;
function setOpacity() {
let elapsedTime = (Date.now() - start);
let targetOpacity = show ? (elapsedTime / duration) : 1-(elapsedTime / duration);
this.container.style.opacity = targetOpacity;
if (elapsedTime > duration) {
this.container.style.display = show ? 'flex' : 'none';
this.container.style.opacity = '';
} else {
requestAnimationFrame(setOpacity.bind(this));
}
}
requestAnimationFrame(setOpacity.bind(this));
}
hide() { this.toggle(false); }
show() { this.toggle(true); }
}
module.exports = Overlay;