No JavaScript support

There are still a measurable number of internet users that browse without the use of JavaScript, use the NoScript plugin, or have disabled it for security purposes. In those cases, as well as for SEO. It’s often a good idea to manipulate the display to better accomodate these users. One of the most common methods is shown below, as we can toggle a CSS class on the HTML tag easily and use CSS “cascade” to hide or show alternate content.

NOTE: this example currently requires PrototypeJS, but can easily be changed to not do so.


<!DOCTYPE html>
<html class="no-js">
<head>
<script type="text/javascript">
var ar = document.getElementsByTagName('html');
var i = ar.length;// should only be one!
while(i--){
Element.removeClassName(ar[i],'no-js');
}
</script>
<style type="text/css>
html .no-js-show { display:none; }
html.no-js .no-js-show { display:block; }
html.no-js .no-js-hide { display:none; }
</style>
</head>
<body>
JavaScript is:
<p class="no-js-hide">enabled</p>
<p class="no-js-show">JavaScript is disabled</p>
</body>
</html>

Leave a Reply