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How to Detect an AdBlocker in JavaScript 📌[All Method]️

The blog is about How to Detect an AdBlocker in JavaScript & provides a lot of information to the novice user and the more seasoned user. After completing this guide, you will know how to face these kind problem.
Question: What is the best solution for this problem? Answer: This blog code can help you solve errors How to Detect an AdBlocker in JavaScript. Question:”What should you do if you run into code errors?” Answer:”By following this blog, you can find a solution.”

Method 1: Blocking Scripts

AdBlockers generally work by blocking scripts with the word ads in the name of the script. For instance, ads.js is a fairly common name for scripts that serve ads, so it’s on almost every block list.

This means that a variable we define inside a script called ads.js will be undefined under an AdBlocker since the script will not have been loaded.

// ads.js
let ad = true;

In another script, we can check for the existence of this variable ad.

// custom.js
if(window.ad === undefined) {
  // AdBlocker detected!

We can then add these scripts into our project.

We would want to place ads.js within our <head> tag and custom.js at the end of the <body> tag in order to give the AdBlocker time to block ads.

<head><script src="ads.js"></script></head>
<body><script src="custom.js"></script></body>

This is a fairly common technique, but it seems to be a bit wasteful since we have to make a request for another script.

Method 2: Blocking DOM Elements

We can circumvent this issue by understanding that AdBlockers also block some DOM elements with the word ads in the class or id of the element. A common one is adsbox (defined as a removable element by AdBlock Plus).

With this information, we can create a <div> with class adsbox inside JavaScript.

// Create element
let ad = document.createElement('div');
ad.className      = 'adsbox';
ad.style.height   = '2px';
ad.style.position = 'absolute';

// Check for ad blocker
let hasAdBlock;
window.setTimeout(function() {
  hasAdBlock = ad.offsetHeight === 0;
}, 100);

We gave it some fixed height (2px) as well as absolute positioning, which will ensure that the element doesn’t mess with the actual layout of the page.

After we create the element, we wait 100ms. It’s long enough for the AdBlocker to do its work, but not long enough for us to notice.

We’ll then check for the height of the element. If there were an AdBlocker, this element would not exist and would have no height.

After all this, we have access to hasAdBlock, which will allow us to do whatever we want with the ad space.

if(hasAdblock) {
  // Show some fallback ad or promotion or random image

Now you learned, How you can use & How to Detect an AdBlocker in JavaScript.
If you need help at any point, please send me a message and I will do my best to assist you.

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