Stand-alone javascript script for cookie warning
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Автономный javascript скрипт для предупреждения об использовании cookies

All English-language materials have been translated fully automatically using the Google service

It is enough to put this code in your javascript file and the message will be shown to the user automatically

(function (window, undefined){
    "use strict";
    var document = window.document;
    function log() {
        if (window.console && window.console.log) {
            for (var x in arguments) {
                if (arguments.hasOwnProperty(x)) {
                    window.console.log(arguments[x]);
                }
            }
        }
    }
    function AcceptCookie() {
        if (!(this instanceof AcceptCookie)) {
            return new AcceptCookie();
        }
        this.init.call(this);
        return this;
    }
    AcceptCookie.prototype = {
        init: function () {
            var self = this;
            if(self.readCookie('COOKIE_ASSEPT') == null)
            {
                self.appendCss();
                self.addCookieBar();
            }
            var clear_cookie_arr = self.getElementsByClass("pjClearCookie", null, "a");
            if(clear_cookie_arr.length > 0)
            {
                self.addEvent(clear_cookie_arr[0], "click", function (e) {
                    if (e.preventDefault) {
                        e.preventDefault();
                    }
                    self.eraseCookie('COOKIE_ASSEPT');
                    document.location.reload();
                    return false;
                });
            }
        },
        getElementsByClass: function (searchClass, node, tag) {
            var classElements = new Array();
            if (node == null) {
                node = document;
            }
            if (tag == null) {
                tag = '*';
            }
            var els = node.getElementsByTagName(tag);
            var elsLen = els.length;
            var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
            for (var i = 0, j = 0; i < elsLen; i++) {
                if (pattern.test(els[i].className)) {
                    classElements[j] = els[i];
                    j++;
                }
            }
            return classElements;
        },
        addEvent: function (obj, type, fn) {
            if (obj.addEventListener) {
                obj.addEventListener(type, fn, false);
            } else if (obj.attachEvent) {
                obj["e" + type + fn] = fn;
                obj[type + fn] = function() { obj["e" + type + fn](window.event); };
                obj.attachEvent("on" + type, obj[type + fn]);
            } else {
                obj["on" + type] = obj["e" + type + fn];
            }
        },
        createCookie: function (name, value, days){
            var expires;
            if (days) {
                var date = new Date();
                date.setTime(date.getTime()+(days*24*60*60*1000));
                expires = "; expires="+date.toGMTString();
            } else {
                expires = "";
            }
            document.cookie = name+"="+value+expires+"; path=/";
        },
        readCookie: function (name) {
            var nameEQ = name + "=";
            var ca = document.cookie.split(';');
            for(var i=0;i < ca.length;i++) {
                var c = ca[i];
                while (c.charAt(0) === ' ') {
                    c = c.substring(1,c.length);
                }
                if (c.indexOf(nameEQ) === 0) {
                    return c.substring(nameEQ.length,c.length);
                }
            }
            return null;
        },
        eraseCookie: function (name) {
            var self = this;
            self.createCookie(name,"",-1);
        },
        appendCss: function()
        {
            var self = this;

            var cssCode = "";
            cssCode += "#a--bar { position: fixed; bottom: 0; left: 0; z-index: 9999; overflow-x: hidden; overflow-y: auto; width: 100%; max-height: 100%; padding: 20px 0; background: #000; border-top:1px solid #fff; opacity: 1; font-family: inherit; text-align: center;}";
            cssCode += "#a--bar * { padding: 0; margin: 0; outline: 0; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; }";
            cssCode += "#a--bar .a--shell { width: 90%; margin: 0 auto; }";
            cssCode += "#a--bar a[href^=tel] { color: inherit; }";
            cssCode += "#a--bar a:focus,";
            cssCode += "#a--bar button:focus { outline: unset; outline: none; }";
            cssCode += "#a--bar p { font-size: 14px; line-height: 1.4; color: #fff; font-weight: 400; }";
            cssCode += "#a--bar .a--actions { padding-top: 10px; }";
            cssCode += "#a--bar .a--but { position: relative; display: inline-block; height: 40px; padding: 10px 30px; border: 0; background: #fff; opacity: 0.9; font-size: 14px; line-height: 14px; color: #000; text-decoration: none; vertical-align: middle; cursor: pointer; border-radius: 0; -webkit-appearance: none; -webkit-border-radius: 0; -webkit-transform: translateZ(0); transform: translateZ(0); -webkit-backface-visibility: hidden; backface-visibility: hidden; -moz-osx-font-smoothing: grayscale;-moz-transition: all 0.5s;-webkit-transition: all 0.5s;-o-transition: all 0.5s;-ms-transition: all 0.5s}";
            cssCode += "#a--bar .a--but:hover {background-color:#ccc}";
            cssCode += "@media only screen and (max-width: 767px) {";
            cssCode += "#a--bar { padding: 15px 0; }";
            cssCode += "#a--bar .a--shell { width: 96%; }";
            cssCode += "#a--bar p { font-size: 14px; }";
            cssCode += "}";
            var styleElement = document.createElement("style");
            styleElement.type = "text/css";
            if (styleElement.styleSheet) {
                styleElement.styleSheet.cssText = cssCode;
            } else {
                styleElement.appendChild(document.createTextNode(cssCode));
            }
            document.getElementsByTagName("head")[0].appendChild(styleElement);
        },
        addCookieBar: function(){
            var self = this;
            var htmlBar = '';
            htmlBar += '<div class="a--shell"><form action="#" method="post">';
            htmlBar += '<p>Для улучшения работы сайта и его взаимодействия с пользователями мы используем файлы cookie. Продолжая работу с сайтом, Вы разрешаете использование cookie-файлов. Вы всегда можете отключить файлы cookie в настройках Вашего браузера.</p>';
            htmlBar += '<div class="a--actions"><button type="button" class="a--but">Понимаю и соглашаюсь</button></div></form></div>';
            var barDiv = document.createElement('div');
            barDiv.id = "a--bar";
            document.body.appendChild(barDiv);
            barDiv.innerHTML = htmlBar;
            self.bindCookieBar();
        },
        bindCookieBar: function(){
            var self = this;
            var btn_arr = self.getElementsByClass("a--but", null, "button");
            if(btn_arr.length > 0)
            {
                self.addEvent(btn_arr[0], "click", function (e) {
                    if (e.preventDefault) {
                        e.preventDefault();
                    }
                    self.createCookie('COOKIE_ASSEPT', 'YES', 365);
                    document.getElementById("a--bar").remove();
                    return false;
                });
            }
        }
    };
    window.AcceptCookie = AcceptCookie;
})(window);

window.onload = function() {AcceptCookie = AcceptCookie();}

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Original found here

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