Do you have a site with ads that want people to see? AdBlockCheck to the rescue! This is a 1KB module for detecting AdBlock with async callbacks for notifying visitors.
It's up to you if you provide a simple hint that you'd like your visitors to see ads or prompt them with an alert.
I recommend adding the script tags before the </body> tag (source).
adblock.check() accepts 2 parameters: A callback function and an optional delay.
<script src="adblockcheck.js"></script>
<script>
adblock.check(function (active) {
if (active) {
// AdBlock is currently enabled
}
}, 500);
</script>You can see a demo on jsfiddle.net here!