returnTop

//---------------------------//
// ===== Scroll to Top ====
// author: Annelyse Egloff
//---------------------------//

export function returnTop(elementID) {

    let el = document.getElementById(elementID);

    const scrollToTop = () => {
        const speed = 8;
        const c = document.documentElement.scrollTop || document.body.scrollTop;
        if (c > 0) {
            window.requestAnimationFrame(scrollToTop);
            window.scrollTo(0, c - c / speed);
        }
    };

    if (el) {
        window.addEventListener("scroll", function () {
            const c = document.documentElement.scrollTop || document.body.scrollTop;
            // If page is scrolled more than 400
            if (c >= (window.outerHeight / 2)) {
                el.classList.add('show');
            } else {
                el.classList.remove('show');
            }
        })

        // on click , go back to top
        el.addEventListener('click', event => {
            scrollToTop();
        });
    }
}