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.

Adblock detection based on ad service URL

// 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);