https://www.cirmagazine.com/cir/bootstrap/js/cookiealert.js

1(function () {
2    "use strict";
3
4    var cookieAlert = document.querySelector(".cookiealert");
5    var acceptCookies = document.querySelector(".acceptcookies");
6
7    if (!cookieAlert) {
8       return;
9    }
10
11    cookieAlert.offsetHeight; // Force browser to trigger reflow (https://stackoverflow.com/a/39451131)
12
13    // Show the alert if we cant find the "acceptCookies" cookie
14    if (!getCookie("acceptCookies")) {
15        cookieAlert.classList.add("show");
16    }
17
18    // When clicking on the agree button, create a 1 year
19    // cookie to remember user's choice and close the banner
20    acceptCookies.addEventListener("click", function () {
21        setCookie("acceptCookies", true, 365);
22        cookieAlert.classList.remove("show");
23    });
24
25    // Cookie functions from w3schools
26    function setCookie(cname, cvalue, exdays) {
27        var d = new Date();
28        d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
29        var expires = "expires=" + d.toUTCString();
30        document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
31    }
32
33    function getCookie(cname) {
34        var name = cname + "=";
35        var decodedCookie = decodeURIComponent(document.cookie);
36        var ca = decodedCookie.split(';');
37        for (var i = 0; i < ca.length; i++) {
38            var c = ca[i];
39            while (c.charAt(0) === ' ') {
40                c = c.substring(1);
41            }
42            if (c.indexOf(name) === 0) {
43                return c.substring(name.length, c.length);
44            }
45        }
46        return "";
47    }
48})();