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Accessible Accordion: Custom Accordion Element
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import { getAbsoluteHeight } from './utils.js'; | |
class Curtain extends HTMLDetailsElement { | |
#summary = this.querySelector('summary'); | |
#content = this.querySelector('.curtain__content'); | |
#animation = null; | |
connectedCallback() { | |
this.#summary.addEventListener('click', this.#handleClick); | |
} | |
disconnectedCallback() { | |
this.#summary.removeEventListener('click', this.#handleClick); | |
} | |
#handleClick = (event) => { | |
event.preventDefault(); | |
if (this.open === false) { | |
this.#open(); | |
return; | |
} | |
this.close(); | |
}; | |
toggle() { | |
if (this.open === true) { | |
this.close(); | |
return; | |
} | |
this.#open(); | |
} | |
#open() { | |
this.style.height = `${this.offsetHeight}px`; | |
if (!this.open) { | |
this.open = true; | |
} | |
window.requestAnimationFrame(() => { | |
const startHeight = `${this.offsetHeight}px`; | |
const endHeight = `${this.#summary.offsetHeight + getAbsoluteHeight(this.#content)}px`; | |
if (this.#animation) { | |
this.#animation.cancel(); | |
} | |
this.classList.add('nh-curtain-new--open'); | |
this.#animation = this.animate( | |
{ | |
height: [startHeight, endHeight] | |
}, | |
{ | |
duration: 400, | |
easing: 'ease-out' | |
} | |
); | |
this.#animation.onfinish = () => this.#onAnimationFinish(true); | |
}); | |
} | |
close() { | |
const startHeight = `${this.offsetHeight}px`; | |
const endHeight = `${this.#summary.offsetHeight}px`; | |
if (this.#animation) { | |
this.#animation.cancel(); | |
} | |
this.classList.remove('nh-curtain-new--open'); | |
this.#animation = this.animate( | |
{ | |
height: [startHeight, endHeight] | |
}, | |
{ | |
duration: 400, | |
easing: 'ease-out' | |
} | |
); | |
this.#animation.onfinish = () => this.#onAnimationFinish(false); | |
} | |
#onAnimationFinish(open) { | |
this.open = open; | |
this.#animation = null; | |
this.style.height = ''; | |
} | |
} | |
customElements.define('curtain-component', Curtain, { extends: 'details' }); |
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