The JavaScript script presented in this page can be used to add dinamically a button in webpage for Scroll to Top.
The button is added and displayed only when vertical scroll-bar position is more then window browser height. If vertical scroll position is less then window's height, the button is removed.
The script is composed by two main pieces: the JavaScript code that adds the button, and the CSS properties that styles it.

• To download the script, click -> Dynamically Button for Scrolling to Page Top, or you can use the codes presented bellow.

- To test it, click Demo, or scroll-down the page; a button for scrolling to top will appear in the bottom-right side of the page.

How to include this script in your webpage

1. Add this code in a .js file, named scrolltop.js :
/** Scroll to Top, from: **/

var scrTop = new Object();
  // function to get scrollbar vertical position
  scrTop.scrollY = function() {
    return window.pageYOffset ? window.pageYOffset : document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;

  // gets the height of the window
  scrTop.brows_height = function() {
    if (self.innerHeight) {
      var brows_hgh = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
      var brows_hgh = document.documentElement.clientHeight;
    } else if (document.body) {
      var brows_hgh = document.body.clientHeight;
    return brows_hgh;

  // function for register event on scroll window
  scrTop.onScrollWin = function() {
    // if exists in page the #sttop element
    if(document.getElementById('sttop')) {
      window.onscroll = function() {
        var scrl_pos = scrTop.scrollY();                // get vertical scrollbar position

        // if vertical scroll position is more then brows_height, and no element '#scrtop'
        // add button to scroll to Top of the page as child element in #sttop
        // else, if vertical scroll position is less then brows_height, and element '#scrtop'
        // remove button to scroll to Top of the page
       if(scrl_pos > scrTop.brows_height() && !document.getElementById('scrtop')) {
         document.getElementById('sttop').innerHTML = '<div id="scrtop" onclick="scrollTo(0,0)"><span>&uArr;</span>TOP</div>';
       else if(scrl_pos < scrTop.brows_height() && document.getElementById('scrtop')) {
2. Add this code in a .css file, named scrolltop.css :
/* For Scroll top */
#sttop {
#sttop #scrtop {
 font-family:Calibri, Arial, sans-serif;
 border-bottom: 1.85em solid #fbfb00;
 border-top: .78em solid #fbfb00;
 border-left: 1em solid transparent;
 border-right: 1em solid transparent;
 height: 0;
#sttop #scrtop:hover {
 border-color: #9eef9f;
#sttop #scrtop span {
 margin:-8px auto -1px auto;
3. In the <head> zone of the HTML document add this code (to include the .css file in that page):
<link href="scrolltop.css" rel="stylesheet" type="text/css" />
4. At the end of the HTML document, before the ending </body> tag, add this code:
<div id="sttop"></div>
<script type="text/javascript" src="scrolltop.js"></script>

Daily Test with Code Example

Which tag adds a new line into a paragraph?
<b> <br> <p>
First line ...<br>
Other line...
Which CSS property can be used to add space between letters?
text-size word-spacing letter-spacing
#id {
  letter-spacing: 2px;
What JavaScript function can be used to get access to HTML element with a specified ID?
getElementById() getElementsByTagName() createElement()
var elm = document.getElementById("theID");
var content = elm.innerHTML;
Click on the "echo" correct instruction.
echo "" echo ""; echo """;
echo "Address URL:";
Dynamically Button to Scroll to Page Top

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