JavaScript Functions for Working with Cookies

// Cookie handeling routines.



// name - name of the cookie

// value - value of the cookie

// [expires] - expiration date of the cookie (defaults to end of current session)

// [path] - path for which the cookie is valid (defaults to path of calling document)

// [domain] - domain for which the cookie is valid (defaults to domain of calling document)

// [secure] - Boolean value indicating if the cookie transmission requires a secure transmission

// * an argument defaults when it is assigned null as a placeholder

// * a null placeholder is not required for trailing omitted arguments

function setCookie(name, value, expires, path, domain, secure) {

  var curCookie = name + "=" + escape(value) +

      ((expires) ? "; expires=" + expires.toGMTString() : "") +

      ((path) ? "; path=" + path : "") +

      ((domain) ? "; domain=" + domain : "") +

      ((secure) ? "; secure" : "");

  document.cookie = curCookie;

}



// name - name of the desired cookie

// * return string containing value of specified cookie or null if cookie does not exist

function getCookie(name) {

  var dc = document.cookie;

  var prefix = name + "=";

  var begin = dc.indexOf("; " + prefix);

  if (begin == -1) {

    begin = dc.indexOf(prefix);

    if (begin != 0) return null;

  } else

    begin += 2;

  var end = document.cookie.indexOf(";", begin);

  if (end == -1)

    end = dc.length;

  return unescape(dc.substring(begin + prefix.length, end));

}



// name - name of the cookie

// [path] - path of the cookie (must be same as path used to create cookie)

// [domain] - domain of the cookie (must be same as domain used to create cookie)

// * path and domain default if assigned null or omitted if no explicit argument proceeds

function deleteCookie(name, path, domain) {

  if (getCookie(name)) {

    document.cookie = name + "=" + 

    ((path) ? "; path=" + path : "") +

    ((domain) ? "; domain=" + domain : "") +

    "; expires=Thu, 01-Jan-70 00:00:01 GMT";

  }

}



// date - any instance of the Date object

// * hand all instances of the Date object to this function for "repairs"

function fixDate(date) {

  var base = new Date(0);

  var skew = base.getTime();

  if (skew > 0)

    date.setTime(date.getTime() - skew);

}