Minimal Analytics Snippet

minimal-analytics-snippet.js

(function (context, trackingId, options) {
    const history = context.history;
    const doc = document;
    const nav = navigator || {};
    const storage = localStorage;
    const encode = encodeURIComponent;
    const pushState = history.pushState;
    const typeException = 'exception';
    const generateId = () => Math.random().toString(36);
    const getId = () => {
        if (!storage.cid) {
            storage.cid = generateId()
        }
        return storage.cid;
    };
    const serialize = (obj) => {
        var str = [];
        for (var p in obj) {
            if (obj.hasOwnProperty(p)) {
                if(obj[p] !== undefined) {
                    str.push(encode(p) + "=" + encode(obj[p]));
                }
            }
        }
        return str.join("&");
    };
    const track = (
        type, 
        eventCategory, 
        eventAction, 
        eventLabel, 
        eventValue, 
        exceptionDescription, 
        exceptionFatal
    ) => {
        const url = 'https://www.google-analytics.com/collect';
        const data = serialize({
            v: '1',
            ds: 'web',
            aip: options.anonymizeIp ? 1 : undefined,
            tid: trackingId,
            cid: getId(),
            t: type || 'pageview',
            sd: options.colorDepth && screen.colorDepth ? `${screen.colorDepth}-bits` : undefined,
            dr: doc.referrer || undefined,
            dt: doc.title,
            dl: doc.location.origin + doc.location.pathname + doc.location.search,
            ul: options.language ? (nav.language || "").toLowerCase() : undefined,
            de: options.characterSet ? doc.characterSet : undefined,
            sr: options.screenSize ? `${(context.screen || {}).width}x${(context.screen || {}).height}` : undefined,
            vp: options.screenSize && context.visualViewport ? `${(context.visualViewport || {}).width}x${(context.visualViewport || {}).height}` : undefined,
            ec: eventCategory || undefined,
            ea: eventAction || undefined,
            el: eventLabel || undefined,
            ev: eventValue || undefined,
            exd: exceptionDescription || undefined,
            exf: typeof exceptionFatal !== 'undefined' && !!exceptionFatal === false ? 0 : undefined,
        });

        if(nav.sendBeacon) {
            nav.sendBeacon(url, data)
        } else {
            var xhr = new XMLHttpRequest();
            xhr.open("POST", url, true);
            xhr.send(data);
        }
    };
    const trackEvent = (category, action, label, value) => track('event', category, action, label, value);
    const trackException = (description, fatal) => track(typeException, null, null, null, null, description, fatal);
    history.pushState = function (state) {
        if (typeof history.onpushstate == "function") {
            history.onpushstate({ state: state });
        }
        setTimeout(track, options.delay || 10);
        return pushState.apply(history, arguments);
    }
    track();
    context.ma = {
        trackEvent,
        trackException
    }
})(window, "XX-XXXXXXXXX-X", {
    anonymizeIp: true,
    colorDepth: true,
    characterSet: true,
    screenSize: true,
    language: true
});

Before I saw this, I always host ga.js locally to improve performance. I'm thinking post action to GA with nginx in the back-end.
I have the same problem like you with GTM, thank you for making this!
Could this method be used to track speed, events and goals too?

@tudou-wp currently not, but I got a lot of feature requests exposing a function to add events. It shouldn't add any significant size.

For all those who want to create their own version, here is the official documentation of this GA endpoint: https://developers.google.com/analytics/devguides/collection/protocol/v1/reference

I'm using https://babeljs.io/en/repl to minify and convert it to a snippet.

Any way to add the Optimize snippet to this code?

Improvements:

• Using navigator.sendBeacon if available
• Ability to track events
• Ability to track exceptions

Hi David, I find this useful. Thanks.

Clever! Would be interested in seeing this on npm, obviously with the mga.init({...}) abstracted out.
Thanks for sharing!

Great idea! Just used it to make a VuePress plugin.

What's the onpushstate bit for?

To compliance with the GDPR and similar, we have 2 options:

ga('create', 'UA-123456789-1');
ga('set', 'allowAdFeatures', false);
ga('set', 'anonymizeIp', true);
ga('send', 'pageview');

This supports "anonymizeIp"... is it possible to support "allowAdFeatures"?

FYI, I've launched a WordPress plugin based on your code... https://wordpress.org/plugins/minimal-analytics/

1. Thanks for sharing this implementation!

2. Please add somewhere on the https://minimalanalytics.com/ the time when was last updated the snippet code from there.

3. Could you make a version that have implemented the "timing" features?
   https://developers.google.com/analytics/devguides/collection/protocol/v1/parameters#timing

Thanks!

Support for custom parameters, for example to implement custom dimensions, would be great.