const headerElem = document.querySelector("#header");
const navColElem = document.querySelector("#header-nav-col");
let updating = false;
const headerHiddingHandler = (event) => {
if (!updating) {
window.requestAnimationFrame(() => {
if (window.innerWidth > 640) {
headerElem.style.marginTop = "";
headerElem.style.opacity = "";
} else {
const navColStyle = window.getComputedStyle(navColElem);
const headerHeight = headerElem.offsetHeight;
const navColMarginTop = parseInt(navColStyle.getPropertyValue("margin-top"), 10);
const navColMarginBottom = parseInt(navColStyle.getPropertyValue("margin-bottom"), 10);
const areaToHideHeight = headerHeight - navColElem.offsetHeight - navColMarginTop - navColMarginBottom - 11;
console.log(headerHeight, navColMarginTop, navColMarginBottom, areaToHideHeight);
if (window.scrollY 10) {
headerElem.style.opacity = "0.8";
} else {
headerElem.style.opacity = "";
}
}
updating = false;
});
updating = true;
}
};
document.addEventListener("scroll", headerHiddingHandler);
window.addEventListener("resize", headerHiddingHandler);