Add this code in "global.js". It works but not 100%.
class Accordion {
constructor(el) {
// Store the <details> element
this.el = el;
// Store the <summary> element
this.summary = el.querySelector('summary');
// Store the <div class="content"> element
this.content = el.querySelector('.accordion__content') || el.querySelector('.content');
// Store the animation object (so we can cancel it if needed)
this.animation = null;
// Store if the element is closing
this.isClosing = false;
// Store if the element is expanding
this.isExpanding = false;
// Detect user clicks on the summary element
this.summary.addEventListener('click', (e) => this.onClick(e));
}
onClick(e) {
// Stop default behaviour from the browser
e.preventDefault();
// Add an overflow on the <details> to avoid content overflowing
this.el.style.overflow = 'hidden';
// Check if the element is being closed or is already closed
if (this.isClosing || !this.el.open) {
this.open();
// Check if the element is being openned or is already open
} else if (this.isExpanding || this.el.open) {
this.shrink();
}
}
shrink() {
// Set the element as "being closed"
this.isClosing = true;
// Store the current height of the element
const startHeight = `${this.el.offsetHeight}px`;
// Calculate the height of the summary
const endHeight = `${this.summary.offsetHeight}px`;
// If there is already an animation running
if (this.animation) {
// Cancel the current animation
this.animation.cancel();
}
// Start a WAAPI animation
this.animation = this.el.animate({
// Set the keyframes from the startHeight to endHeight
height: [startHeight, endHeight]
}, {
duration: 500,
easing: 'ease-in'
});
// When the animation is complete, call onAnimationFinish()
this.animation.onfinish = () => this.onAnimationFinish(false);
// If the animation is cancelled, isClosing variable is set to false
this.animation.oncancel = () => this.isClosing = false;
}
open() {
// Apply a fixed height on the element
this.el.style.height = `${this.el.offsetHeight}px`;
// Force the [open] attribute on the details element
this.el.open = true;
// Wait for the next frame to call the expand function
window.requestAnimationFrame(() => this.expand());
}
expand() {
// Set the element as "being expanding"
this.isExpanding = true;
// Get the current fixed height of the element
const startHeight = `${this.el.offsetHeight}px`;
// Calculate the open height of the element (summary height + content height)
const endHeight = `${this.summary.offsetHeight + this.content.offsetHeight}px`;
// If there is already an animation running
if (this.animation) {
// Cancel the current animation
this.animation.cancel();
}
// Start a WAAPI animation
this.animation = this.el.animate({
// Set the keyframes from the startHeight to endHeight
height: [startHeight, endHeight]
}, {
duration: 400,
easing: 'ease-out'
});
// When the animation is complete, call onAnimationFinish()
this.animation.onfinish = () => this.onAnimationFinish(true);
// If the animation is cancelled, isExpanding variable is set to false
this.animation.oncancel = () => this.isExpanding = false;
}
onAnimationFinish(open) {
// Set the open attribute based on the parameter
this.el.open = open;
// Clear the stored animation
this.animation = null;
// Reset isClosing & isExpanding
this.isClosing = false;
this.isExpanding = false;
// Remove the overflow hidden and the fixed height
this.el.style.height = this.el.style.overflow = '';
}
}
document.querySelectorAll('details').forEach((el) => {
new Accordion(el);
});
