| There are many sites on the web that will ask you to
register in order to get some level of enhanced access. Once you have
registered, you are given a username and password. the next time you
visit the site, you are asked to enter these before being granted
access. Some sites will give the option of saving your username and
password as a cookie, so that you will automatically be logged in the
next time you visit. The example below will, hopefully, illustrate this.
 1st
Example:
The page will display the login screen for the user. They are asked to
enter their email address and password. They can also click on a
checkbox that will have their login information saved as a cookie.
2nd
Example:
The login page will check for the existence of a cookie. The login check
page will inform the user if their login was entered via a cookie, or by
direct input.
Creating
Cookies with ASP
The syntax for writing cookies:
<% Response.Cookies("cookie")
= value %>
NOTE: If value is a string, it must be enclosed in quotes.
OR
<% Response.Cookies("cookie")("key")
= value %>
If you add a key value, then you can access this cookie like a
collection. This means that one cookie can have multiple values stored
with it.
If a cookie is used to store more than one value we have to specify
which of these multiple values we want to set. To do this, we refer to
it via its key value. The key value is similar to a variable name. The
general syntax for writing cookies with keys is:
Reponse.Cookies("thesameCookieName")("somekey")
= "SomeValue"
Reponse.Cookies("thesameCookieName")("anotherkey")
= "AnotherValue"
The way the actual cookie will look like:
.sislands.com TRUE / FALSE 982399541
thesameCookieName somekey=SomeValue&anotherkey=AnotherValue
Notice the value of the cookie is really the URLencoding of the NAME=VALUE&NAME=VALUE
pairs
ASP use the HasKeys property to
determine whether or not a cookie holds multiple values. To check if a
cookie holds multiple values, we interrogate the HasKeys
property:
Request.Cookies("theCookie").HasKeys
If the cookie named theCookie has keys, then this value will be true.
If not, then it will be false. |
