Source: public/javascripts/back-to-top-button.js

  1. /**
  2.  * @module Client_Index
  3.  */
  4. var btn = document.getElementById("btt-btn");
  5. window.onscroll = function() { detectScroll() };
  7. /**
  8.  * Detect scrolling to make back-to-top button visible
  9.  */
  10. function detectScroll() {
  11.     if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
  12.         btn.style.display = "block";
  13.     } else {
  14.         btn.style.display = "none";
  15.     }
  16. }
  18. /**
  19.  * Scroll to the top of the site
  20.  */
  21. function backToTop() {
  22.     document.body.scrollTop = 0;
  23.     document.documentElement.scrollTop = 0;
  24. }