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ASP Cookies

A cookie can be used to identify a user.

Examples

Welcome cookie
How to create a Welcome cookie.

What is a Cookie?

A cookie can be used to identify a user. It is a small file that the server embeds on the user's computer. Each time the same computer asks for a page through a browser, it will send the cookie too.

With ASP, you can both create cookies and retrieve the value of cookies.

How to Create a Cookie

The "Response.Cookies" command is used to create a cookie:

<%
Response.Cookies("firstname")="Alex"
%>

In the code above, we have created a cookie named "firstname" and assigned the value "Alex" to it.

Note: The Response.Cookies command must appear before the <html> tag.

It is also possible to assign some properties to a cookie, like setting a date when a cookie should expire:

<%
Response.Cookies("firstname")="Alex" 
Response.Cookies("firstname").Expires=#May 10,2002#
%>

Now the cookie named "firstname" has the value of "Alex", and it will expire from the user's computer at May 10, 2002.

How to Get a Cookie Value

The "Request.Cookies" command is used to get a cookie value.

In the example below, we retrieve the value of the cookie "firstname" and display it on a page:

<%
fname=Request.Cookies("firstname")
response.write("Firstname=" & fname)
%>

Output:

Firstname=Alex

A Cookie with Keys

A cookie can also contain a collection of multiple values. We say that the cookie has Keys.

In the example below, we will create a cookie-collection named "user". The "user" cookie has Keys that contains information about a user:

<%
Response.Cookies("user")("firstname")="John"
Response.Cookies("user")("lastname")="Smith"
Response.Cookies("user")("country")="Norway"
Response.Cookies("user")("age")="25"
%>

Read all Cookies

The example below reads all the cookies your server has sent to a user. Note that the code below checks if a cookie has Keys with the HasKeys property:

<html>
<body>

<%
dim x,y

for each x in Request.Cookies
  response.write("<p>")
  if Request.Cookies(x).HasKeys then
    for each y in Request.Cookies(x)
      response.write(x & ":" & y & "=" & Request.Cookies(x)(y))
      response.write("<br />")
    next
  else
    Response.Write(x & "=" & Request.Cookies(x) & "<br />")
  end if
  response.write "</p>"
next
%>

</body>
</html>

Output:

firstname=Alex

user:firstname=John
user:lastname=Smith
user: country=Norway
user: age=25

What if a Browser Does NOT Support Cookies?

If your application deals with browsers that do not support cookies, you will have to use other methods to pass information from one page to another in your application. There are two ways of doing this:

1. Add parameters to a URL

Add parameters to a URL, like this:

<a href="greeting.asp?fname=John&lname=Smith">
Go to Welcome Page</a>

And retrieve the values like this (in the file greeting.asp):

<%
fname=Request.querystring("fname")
lname=Request.querystring("lname")
response.write("<p>Hello " & fname & " " & lname & "!</p>")
response.write("<p>Welcome to my Web site!</p>")
%>

2. Use a form

The form passes the filled out information to the file greeting.asp when the user clicks on the Send button:

<form method="post" action="greeting.asp">
First Name:  <input type="text" name="fname" value="">
Last Name: <input type="text" name="lname" value="">
<input type="submit" value="Send">
</form>

Retrieve the values like this (in the file greeting.asp):

<%
fname=Request.form("fname")
lname=Request.form("lname")
response.write("<p>Hello " & fname & " " & lname & "!</p>")
response.write("<p>Welcome to my Web site!</p>")
%>

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