This is a simple way of detecting if Adblock is present or not. We check for visibility after 100ms because we need to gives some time to Adblock to intercept the request and also apply its invisibility styling to the iframe. offsetHeight = 0 )Īlert ( "Adblock is blocking ads on this page" ) Īlert ( "Adblock is not detecting ads on this page" ) In the URL use the words specific to advertising so that Adblock can do string matching. And then after 100ms check if their offsetHeight, display or visibility is set such a way that user cannot see them.
If the elements are hidden then we can be sure that Adblock is installed and running in user browser. And then detect if resource is been hidden or not.
We can simply include iframes, images and scripts on our webpage and then point them to advertising networks or embed advertising specific keywords in the URLs. It identifies the domain names of advertising networks and also uses build in filters and keywords to identify advertising links.Īdblock identifies text ads using a list of keywords and hides the advertising text using CSS.įilters allows users to specify new domain names, words and other things to be blocked by Adblock. And then it blocks(HTTP and HTTPS requests) and hides(CSS display, visibility and height) those advertisements. Now we will look at each of them.Īdblock uses source URL of images, iframes, scripts and flash files to identify advertisements in the page. Mechanisms are Blocking Requests, Element Hiding and Filters. How does Adblock work?Īdblock uses three simple mechanisms to block ads. Its important to understand how adblock works before we find a way to detect presence of adblock.
So only those users can view your website who don’t have adblock installed. Websites that depend on ads for revenue can detect adblock and than stop users from viewing their site. In this post we will look at how we can detect if user has installed Adblock extension or not.
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