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cookies.js
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2000-08-05
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2KB
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60 lines
function getCookie(NameOfCookie)
{
// First we check if there is a cookie stored at all.
// Otherwise the length of document.cookie would be zero.
if (document.cookie.length > 0)
{
// Second we check if the cookies name is stored in the
// "document.cookie"-object for the page.
// Since more than just 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 cookiename 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.
}
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 finaly the number of days till the cookie expires.
// The first lines in the function converts
// 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 Meantime using
// the "toGMTstring()"-function.
document.cookie = NameOfCookie + "=" + escape(value) +
((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());
}