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Editorial Team
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Asked: 2026-05-20T02:37:16+00:00

I placed a piece of ads code in a div and at the bottom

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I placed a piece of ads code in a div and at the bottom of page, I have javascript code that checks for the offsetHeight size of the div. If “0” is returned, I could safely assume that the ads has been chewed by ad blockers

What I’m trying to do is, I want an image to appear in the spot where the ads was supposed to be showing when the ads was blocked.

Any idea how to do this?

Edit: Forgot to show the codes

<div id="div_bleh">
ads goes here
</div>

<script type="text/javascript">
function check_blehsize()
{
    if (document.getElementById("div_bleh").offsetHeight == 0)
        // do stuff
}
window.onload = check_blehsize;
</script>
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1 Answer

  1. Editorial Team

    Here’s an example which I tested against a very common ad blocker – Firefox’s Adblock Plus (using the EasyList filter):

    Live Demo (edit)

    <!DOCTYPE html>
<html>
<head>
<style type="text/css">
.innocent-class {
    background: url(http://www.google.com/images/logos/ps_logo2.png);
    width: 240px;
    height: 400px
}


.justForTesting, .advertise_ads {
    width: 240px;
    height: 400px;
    background: #fff
}
</style>
</head>

<body>

<div class="innocent-class"> <!-- just don't call it "advertContainer" :) -->
    <div class="advertise_ads justForTesting">
        advert here!
    </div>
</div>

</body>
</html>

    When Adblock Plus finds an element with a class (for example) .advertise_ads, it will hide that element.

    If it does, the “please don’t block my ads!” background-image (in this case, the Google logo) from the parent element will be visible.

    If the advert isn’t blocked, the advert will cover the replacement image.

    Try changing advertise_ads to something else such as sdpfjsdfjp, and the advert will be visible.

    I imagine this technique will also work with most other ad blockers.

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