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December 28, 2020 10:06
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Adblock detection based on ad service URL. This implementation for adblock detection is based on a blocked URL. In certain scenarios, adblockers stop element hiding (which generally is used to detect adblockers) and this approach goes around it.
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// MutationObserver demo from : https://jsfiddle.net/Xotic750/gZysL/ | |
(function(global){ | |
"use strict"; | |
let adServiceUrl; // ex. Google tag manager, ad sence, fb pixel, etc | |
if (!("MutationObserver" in global)) { | |
global.MutationObserver = global.WebKitMutationObserver || global.MozMutationObserver; | |
} | |
// random string gen by : https://gist.github.com/6174/6062387 | |
let randomStr = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15), | |
containerId = "container." + randomStr, | |
imgId = "img." + randomStr; | |
// Create an observer instance to execute when mutations are observed | |
let observer = new MutationObserver(function (mutationsList) { | |
console.log(mutationsList); | |
mutationsList.forEach(mutation => { | |
if(mutation.type == 'childList') { | |
Array.prototype.forEach.call(mutation.target.children, function(child) { | |
if (child.id === imgId) { | |
child.addEventListener('load', function() { | |
alert("No adblocker detected"); | |
}); | |
child.addEventListener('error', function() { | |
alert("Adblocker detected"); | |
}) | |
} | |
}); | |
} | |
}); | |
}); | |
// create wrapper id | |
let div = document.createElement('div'); | |
div.id = containerId; | |
div.style = "width:1px;height:1px;"; | |
document.body.append(div); | |
let container = document.getElementById(containerId); | |
// Start observing the target node for configured mutations | |
observer.observe(container, { | |
attributes: true, | |
characterData: true, | |
childList: true, | |
subtree: true, | |
attributeOldValue: true, | |
characterDataOldValue: true | |
}); | |
// Add child image with the ad service link | |
let img = new Image(1, 1); | |
img.id = imgId; | |
img.src = adServiceUrl; | |
container.append(img); | |
})(window); |
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