Use JavaScript to limit Google Analytics and Yandex.Metrica to track only the referral sources and screen sizes

I prefer not to include external JavaScript on my website for unnecessary tracking purposes.

However, I do need to gather referrer and screen size information, which cannot be achieved with a regular HTML img tag alone.

What is the most standard-compliant, browser-supported, and visually-friendly method to load an invisible 1x1 pixel gif image with referrer and screen size parameters in the URL?

I am seeking a general solution, but feel free to reference the Google Analytics GIF Request Parameters if needed.

javascripthtmlcssgoogle-analyticsyandex-api

Answer №1

Retrieve the referrer using the code document.referrer.

Access the screen resolution with window.screen.width and window.screen.height.

To trigger the tracking pixel request in the browser, utilize new Image() and remember to sanitize the values by using encodeURIComponent before appending them to the URL.

var r = encodeURIComponent(document.referrer),
    x = window.screen.width,
    y = window.screen.height,
    img = new Image();
img.src = '/tracking.gif?x=' + x + '&y=' + y + '&r=' + r;

Keep in mind that subsequent requests will be cached, potentially affecting pageview count. However, this can be beneficial for implicit unique visitor tracking. To prevent caching, consider adding the current timestamp using new Date().getTime(); as an extra parameter.

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