In order to use cookies on a page you need:

  • a function that reads the cookie (if present)
  • a function that stores the cookie
  • a function that deletes the cookie

Below are three functions that perform these tasks:

  • getCookie
  • setCookie
  • delCookie


function getCookie(NameOfCookie)

// First we check to see if there is a cookie stored.
// Otherwise the length of document.cookie would be zero.

if (document.cookie.length > 0) 

// Second we check to see if the cookie's name is stored in the
// "document.cookie" object for the page.

// Since more than one cookie can be set on a
// single page it is possible that our cookie
// is not present, even though the "document.cookie" object
// is not just an empty text.
// If our cookie name is not present the value -1 is stored
// in the variable called "begin".

begin = document.cookie.indexOf(NameOfCookie+"="); 
if (begin != -1) // Note: != means "is not equal to"

// Our cookie was set. 
// The value stored in the cookie is returned from the function.

begin += NameOfCookie.length+1; 
end = document.cookie.indexOf(";", begin);
if (end == -1) end = document.cookie.length;
return unescape(document.cookie.substring(begin, end)); } 
return null; 

// Our cookie was not set. 
// The value "null" is returned from the function.


br /> 

function setCookie(NameOfCookie, value, expiredays) 

// Three variables are used to set the new cookie. 
// The name of the cookie, the value to be stored,
// and finally the number of days until the cookie expires.
// The first lines in the function convert 
// the number of days to a valid date.

var ExpireDate = new Date ();
ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));

// The next line stores the cookie, simply by assigning 
// the values to the "document.cookie" object.
// Note the date is converted to Greenwich Mean time using
// the "toGMTstring()" function.

document.cookie = NameOfCookie + "=" + escape(value) + 
((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());




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