JavaScript Removing an unwanted part of an external JavaScript remove unwanted part of image online,remove unwanted part of

Similar to Michael's solution, it should be possible to prevent the javascript from executing by running some code first. If you run the following before adding the script:

document.getElementsByTagName("body")[0].appendChild = function() {};

Their script will be unable to add the image to the dom. If you need to use that method for yourself, assign it to a different variable first. Or try:

var oldMethod = document.getElementsByTagName("body")[0].appendChild;
document.getElementsByTagName("body")[0].appendChild = function(node) {
    if (node.src !== "http://somedomain.com/tracking.php") {
        oldMethod(node);
    }
}
Answer:1

Similar to what others suggested - cause the unwanted script part to fail, but using a cleaner "block", we can snatch the img identifier and prevent it from being used. We do that be using Object.defineProperty(), which, by default creates a non-configurable, non-writable property.

Object.defineProperty(window, 'img', {value: null}); // this snatches the identifier

img = document.createElement('img'); // <- this won't work

alert(img); // <- this is null
Answer:2

I alluded to this in my comments, but I think the only way to achieve what you ask is to AJAX load the script (if the server permits it) and parse out the offending code. That seems overly complex and error-prone, and borderline unethical. I would suggest that you contact the host of the script somedomain.com and ask if they can provide a version without the image tracker. If they decline, then you should respect their wishes. After all, it is their content (the first part of the script) that you want, and they have every right to specify your obligations to use it. If you don't like their terms, don't use their content.

(BTW, I'm not suggesting that image trackers are a good thing. I despise them.)

Answer:3

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