ricardozea
5/5/2014 - 3:21 PM

[JavaScript] Smooth scroll to top of page

Smooth scroll to top of page

Smooth scroll to top of page.markdown
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Visit the new improved script here! Smooth scroll to top of page (Improved!)

Smooth scroll to top of page (Legacy!)

If you need a plain JavaScript function to add a smooth scrolling back to the top of the page, you can use this script.

  1. Add an id of "top" to the <body> tag. Like this: <body id="top">
  2. Add the onclick function to the link. Like this: <a href="#top" onclick="scrollToTop(); return false">Back to Top ↑</a>
  3. Then either:
  • Include the JavaScript function in your markup, preferrably at the bottom before the closing </body> tag if possible.
  • Or, create a JavaScript file, place the script in it and call that file from your HTML document (either from the </head> section, or before the closing </body> tag if possible.)

Since this script is not part of the UI it can load last and will not negatively affect the user experience or usability of the page.

CodePen demo here: https://codepen.io/ricardozea/pen/5f756e303d5adc25ca3876e6a81c9e57

Author: Marco Del Corno - http://thewebthought.blogspot.com/2012/06/javascript-smooth-scroll-to-top-of-page.html

index.html
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<body id="top">

<a href="#top" onclick="scrollToTop();return false">Back to Top &uarr;</a>
javascript.js
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function scrollToTop() {
    var position =
        document.body.scrollTop || document.documentElement.scrollTop;
    if (position) {
        window.scrollBy(0, -Math.max(1, Math.floor(position / 10)));
        scrollAnimation = setTimeout("scrollToTop()", 30);
    } else clearTimeout(scrollAnimation);
}