first draft

1 files changed, 17 insertions, 0 deletions

diff --git a/backtop.js b/backtop.js
new file mode 100644
index 0000000..4bab48d
--- /dev/null
+++ b/backtop.js
@@ -0,0 +1,17 @@
+// When the user scrolls down 20px from the top of the document, show the button
+window.onscroll = function() {scrollFunction()};
+scrollFunction();
+
+function scrollFunction() {
+    if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
+	document.getElementById("myBtn").style.display = "block";
+    } else {
+	document.getElementById("myBtn").style.display = "none";
+    }
+}
+
+// When the user clicks on the button, scroll to the top of the document
+function topFunction() {
+    document.body.scrollTop = 0; // For Safari
+    document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
+}