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button.js
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button.js
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const backToTopButton = document.querySelector(".button-frame");
window.addEventListener("scroll", scrollFunction);
function scrollFunction() {
if(window.pageYOffset > 300) {
if(!backToTopButton.classList.contains("btnEntrance")){
backToTopButton.classList.remove("btnExit");
backToTopButton.classList.add("btnEntrance");
backToTopButton.style.display = "block";
}
}
else {
if(!backToTopButton.classList.contains("btnExit")){
backToTopButton.classList.remove("btnEntrance");
backToTopButton.classList.add("btnExit");
setTimeout(function(){
backToTopButton.style.display = "none";
}, 500);
}
}
}
backToTopButton.addEventListener("click", backToTop);
function backToTop() {
window.scrollTo(0, 0);
}