Cookies are simply text strings that a browser writes to your PC. JavaScript can
direct the browser to write cookies.
Each web page can have 1 cookie, which can be about 4096 bytes of data.
A browser will store about 300 cookies total,
with
no more than 20 cookies allowed
per web site. These values can vary slightly, depending
on the browser.
When a cookie is written that exceeds the limits, the least recently used cookie
is deleted to make room
for
newer cookies.
The simplest cookie takes the form of
"name=value;"
A cookie has four optional attributes
:
-
path identifies path to documents which may access the cookie
-
domain server(s) which may access the cookie
-
expires date cookie will be deleted
-
secure limits cookie to transmission only over a secure channel (HTTPS)
A complete cookie looks like
this
:
name
=
value;path
=/
myfolder;domain
=
www.domain.com;expires
=
date;secure
=
true
Notice there are no quotes or space or punctuation marks
in
the cookie string.
By
default
a cookie lasts only during the current browser session. When the
browser session is over the cookie is destroyed unless the expires attribute
is set to a future date (expiration date).
Only when the current browser session is over is the cookie written to a file.
To get the entire cookie content use
:
var
CookieString
=
document.cookie;
To set the cookie use
:
document.cookie
=
CookieString
Building or editing the cookie string is the tricky part
