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phoenix_duskmoon
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4.0.0
Duskmoon UI component library for Phoenix LiveView
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Files
assets/js/hooks/page_header.js
/**
* PageHeader Hook
* Handles IntersectionObserver for showing/hiding nav based on header visibility
*/
export const PageHeader = {
mounted() {
// Skip if the inline script already set up the observer
if (this.el._dmPageHeaderObserved) return;
this.el._dmPageHeaderObserved = true;
const navId = this.el.dataset.navId;
const navEl = document.getElementById(navId);
if (!navEl) {
console.warn(`PageHeader hook: Nav element with id "${navId}" not found`);
return;
}
// Create threshold list for smooth transitions
const thresholds = [];
for (let i = 0; i <= 10; i++) {
thresholds.push(i / 10);
}
const options = {
root: null,
rootMargin: "0px",
threshold: thresholds,
};
this.observer = new IntersectionObserver((entries) => {
entries.forEach(entry => {
const intersectionRatio = entry.intersectionRatio;
if (intersectionRatio <= 0.5) {
navEl.classList.remove('hidden');
navEl.setAttribute('aria-hidden', 'false');
navEl.style.opacity = 1 - intersectionRatio;
} else {
navEl.classList.add('hidden');
navEl.setAttribute('aria-hidden', 'true');
}
});
}, options);
this.observer.observe(this.el);
},
destroyed() {
if (this.observer) {
this.observer.disconnect();
}
}
};