Client side cookie manipulation

cookies.js

/**
 * Get a cookie by key
 */
function getCookieItem(sKey) {
  if (!sKey || !this.hasCookieItem(sKey)) { return null; }
  return unescape(document.cookie.replace(new RegExp("(?:^|.*;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*((?:[^;](?!;))*[^;]?).*"), "$1"));
}

/**
 * Set a cookie
 */
function setCookieItem(sKey, sValue, vEnd, sPath, sDomain, bSecure) {
  if (!sKey || /^(?:expires|max\-age|path|domain|secure)$/i.test(sKey)) { return; }
  var sExpires = "";
  if (vEnd) {
    switch (vEnd.constructor) {
      case Number:
        sExpires = vEnd === Infinity ? "; expires=Tue, 19 Jan 2038 03:14:07 GMT" : "; max-age=" + vEnd;
        break;
      case String:
        sExpires = "; expires=" + vEnd;
        break;
      case Date:
        sExpires = "; expires=" + vEnd.toGMTString();
        break;
    }
  }
  document.cookie = escape(sKey) + "=" + escape(sValue) + sExpires + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "") + (bSecure ? "; secure" : "");
}

/**
 * Delete cookie by key
 */
function removeCookieItem(sKey, sPath) {
  if (!sKey || !this.hasCookieItem(sKey)) { return; }
  document.cookie = escape(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" + (sPath ? "; path=" + sPath : "");
}

/**
 * Check existence of cookie by key
 */
function hasCookieItem(sKey) {
  return (new RegExp("(?:^|;\\s*)" + escape(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(document.cookie);
}