CODE EXAMPLE FOR JAVASCRIPT

set cookie and get cookie in javascript

<script type="text/javascript">
    function setCookie(key, value, expiry) {
        var expires = new Date();
        expires.setTime(expires.getTime() + (expiry * 24 * 60 * 60 * 1000));
        document.cookie = key + '=' + value + ';expires=' + expires.toUTCString();
    }

    function getCookie(key) {
        var keyValue = document.cookie.match('(^|;) ?' + key + '=([^;]*)(;|$)');
        return keyValue ? keyValue[2] : null;
    }

    function eraseCookie(key) {
        var keyValue = getCookie(key);
        setCookie(key, keyValue, '-1');
    }

</script>