Update index.js

anaelle1531 · Feb 1, 2025 · 063280b · 063280b
1 parent c598db4
commit 063280b
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/index.js b/index.js
@@ -38,3 +38,19 @@ document.addEventListener("DOMContentLoaded", function () {
         science_img.setAttribute("src", "science1.jpg"); // modification d'un attribut de l'element HTML
     }    
 });
+
+document.addEventListener("DOMContentLoaded", function () {
+    let scrollToTopBtn = document.getElementById("scrollToTop");
+
+    window.addEventListener("scroll", function () {
+        if (window.scrollY > 300) {
+            scrollToTopBtn.style.display = "block";
+        } else {
+            scrollToTopBtn.style.display = "none";
+        }
+    });
+
+    scrollToTopBtn.addEventListener("click", function () {
+        window.scrollTo({ top: 0, behavior: "smooth" });
+    });
+});