codeninjasuk.github.io/_includes/cookie.html

<!-- Only add all this in production, why would I analyse myself when writing the post anyway. -->

<!-- Add cookie consent css & js -->
<link rel="stylesheet"
    type="text/css"
    href="https://cdn.jsdelivr.net/npm/cookieconsent@3/build/cookieconsent.min.css"/>
<script src="https://cdn.jsdelivr.net/npm/cookieconsent@3/build/cookieconsent.min.js"
    data-cfasync="false"></script>

<!-- Add google analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id={{site.ganalytics}}"></script>

<script>
    // Reads the value of a cookie by name or returns empty string
    function getCookie(name) {
        var b = document.cookie.match('(^|[^;]+)\\s*' + name + '\\s*=\\s*([^;]+)');
        return b ? b.pop() : '';
    }

    // Actually starting analytics up
    function addAnalytics() {
        window.dataLayer = window.dataLayer || [];

        function gtag() {
            dataLayer.push(arguments);
        }

        gtag('js', new Date());
        gtag('config', '{{site.ganalytics}}');
    }

    // Waiting for the load event
    window.addEventListener("load", function () {
        // Reading "cookieconsent_status" cookie
        const cookieConsent = getCookie('cookieconsent_status');

        // Start analytics if user consented or did not deny
        if (cookieConsent === 'allow' || cookieConsent === '') {
            addAnalytics();
        }

        // Initialise cookie consent banner
        window.cookieconsent.initialise({
            "palette": {
                "popup": {
                    "background": "#efefef",
                    "text": "#404040"
                },
                "button": {
                    "background": "#8ec760",
                    "text": "#ffffff"
                }
            },
            "type": "opt-out",
            "content": {
                "allow": "Approve",
                "dismiss": "Approve",
                "deny": "Reject"
            },
            // Reload the page on user choice to make sure cookie is set
            onStatusChange: function (status, chosenBefore) {
                location.reload();
            }
        })
    });
</script>