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: http://coursesweb.net/javascript/ **/

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')) {
         document.getElementById('sttop').removeChild(document.getElementById('scrtop'));
       }
     }
   }
  }
scrTop.onScrollWin();
2. Add this code in a .css file, named scrolltop.css :
/* For Scroll top */
#sttop {
 position:relative;
}
#sttop #scrtop {
 position:fixed;
 top:80%;
 right:1.58%;
 width:1.8em;
 cursor:pointer;
 text-align:center;
 font-family:Calibri, Arial, sans-serif;
 line-height:1.4em;
 font-size:.7em;
 padding:0;
 font-weight:800;
 color:blue;
 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;
 color:#000100;
-moz-border-radius:1.1em;
-webkit-border-radius:1.1em;
-khtml-border-radius:1.1em;
border-radius:1.1em;
}
#sttop #scrtop span {
 display:block;
 margin:-8px auto -1px auto;
 font-size:1.85em;
 color:#fb0100;
}
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

HTML
CSS
JavaScript
PHP-MySQL
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;
alert(content);
Click on the "echo" correct instruction.
echo "CoursesWeb.net" echo "CoursesWeb.net"; echo ""CoursesWeb.net";
echo "Address URL: http://CoursesWeb.net";
Dynamically Button to Scroll to Page Top

Last accessed pages

  1. Select in MySQL, Output results in HTML Table (1419)
  2. Golf Putt It In (739)
  3. Disable button and Enable it after specified time (5129)
  4. Flash Games - Free online Games (22975)
  5. Move image from an element /tag to another (1637)

Popular pages this month

  1. Qwop (3219)
  2. Get Attribute (ID, Class, Name, Title, Src) with jQuery (2547)
  3. Get the value of the selected /checked checkboxes in a form (1608)
  4. Insert, Select and Update NULL value in MySQL (1423)
  5. Add, Change, and Remove Attributes with jQuery (1301)