cookiehelper.js

(function (window) {
    function CookieHelper() {

    }

    // utility function to retrieve an expiration date in proper
    // format; pass three integer parameters for the number of days, hours,
    // and minutes from now you want the cookie to expire (or negative
    // values for a past date); all three parameters are required,
    // so use zeros where appropriate
    CookieHelper.prototype.getExpDate = function getExpDate(days, hours, minutes) {
        var expDate = new Date();
        if (typeof days == 'number' && typeof hours == 'number' &&
                typeof minutes == 'number') {
            expDate.setDate(expDate.getDate() + parseInt(days));
            expDate.setHours(expDate.getHours() + parseInt(hours));
            expDate.setMinutes(expDate.getMinutes() + parseInt(minutes));
            return expDate.toUTCString();
        }
    };

    CookieHelper.prototype.getCookieVal = function getCookieVal(offset) {
        var endstr = document.cookie.indexOf(';', offset);
        if (endstr == -1) {
            endstr = document.cookie.length;
        }

        return decodeURI(document.cookie.substring(offset, endstr));
    };

    // primary function to retrieve cookie by name
    CookieHelper.prototype.getCookie = function getCookie(name) {
        var arg = name + '=';
        var alen = arg.length;
        var clen = document.cookie.length;
        var i = 0;
        while (i < clen) {
            var j = i + alen;
            if (document.cookie.substring(i, j) == arg) {
                return this.getCookieVal(j);
            }
            i = document.cookie.indexOf(' ', i) + 1;
            if (i == 0) break;
        }
        return '';
    };

    CookieHelper.prototype.setCookie = function setCookie(name, value, expires, path, domain, secure) {
        document.cookie = name + '=' + encodeURI(value) +
                ((expires) ? '; expires=' + expires : '') +
                ((path) ? '; path=' + path : '') +
                ((domain) ? '; domain=' + domain : '') +
                ((secure) ? '; secure' : '');
    };

    // remove the cookie by setting ancient expiration date
    CookieHelper.prototype.deleteCookie = function deleteCookie(name, path, domain) {
        if (this.getCookie(name)) {
            document.cookie = name + '=' +
                    ((path) ? '; path=' + path : '') +
                    ((domain) ? '; domain=' + domain : '') +
                    '; expires=Thu, 01-Jan-70 00:00:01 GMT';
        }
    };

    window.CookieHelper = new CookieHelper();
})(window);