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Using Cookies

The cookies collection stores values from any cookies that are sent by the client to the server. The server needs to be able to write information to cookies on the clients machine. ASP uses the Response object's cookies collection to set cookies values.

Creating Cookies

The Cookies collection sets the value of a cookie. If the specified cookie does not exist, it is created. If the cookie exists, it takes the new value and the old value is discarded.

Syntax:
Response.Cookies(cookie)[(key)|.attribute]=value

parameters

cookie: The name of the cookie

key: An optional parameter. If key is specified, cooke is a dictionary, and key is set to value.

attribute:Specifies information bout the cookie itself. The attribute parameter can be one of the following.

  1. Domain: Write-only. If Specified, the cookie is end only to requests to this domain.
  2. Expries: Write-only. The date on which the cookie expires. This date must be set in order for the cookie to be stored on the client's dish after the session ends. If this attribute is not set to a date beyond the current date, the cookie will expire when the session ends.
  3. HasKeys: Read-only. Specifies whether the cookie contains keys.
    Path: Write-only. If specified, the cookie is sent only to requests to this path. If this attribute is not set, the application path is used.
  4. Secure: Write-only. Specifies whether the cookie is secure.

Value: Specifies the value to assign to key or attribute.

Remarks

If a cookie with a key is created, as in the following script,

<%
Reponse.Cookies("mycookie")("type1")="sugar"
Reponse.Cookies("mycookie")("type2")="sugar"
%>

this header is sent

Set-Cookie: MYCOOKIE=TYPE1=sugar&TYPE2=ginger=sugar

A subsequent assignment to mycookie without specifying a key, would destroy type1 and type2.

This is shown in the following example.
<% Response.Cookies("mycookies") = "chocolate chip" %>

In the preceding example, the keys type1 and type2 are destroyed and their values are discarded. The mycookie cookie now has the value "chocolate chip".

Conversely, if you call a cookie with a key, it destroys any nonkey values the cookie contained. For example, if after the preceding code you call Response.Cookies with the following

<% Reponse.Cookies("MyCookie")("newType")= " peanut butter"%>

The value chocolate chip is discarded and newType would be set to peanut butter.

To determine whether a cookie has keys, use the following syntax.

<%=ResPonse.Cookies("myCookie").HasKeys%>

If mycookie is a cookie dictionary, the preceding value is TRUE. Otherwise, it is FALSE.

You can use an iterator to set cookie attributes. For example, to set all of the cookies to expire on a particular date, use the following syntax.

<%
For Each cookie in Reponse.Cookies
Response.Cookies(cookie).Expires = #July 4, 1998#
Next
%>

You can also use an iterator to set the values of all the cookies in a collection, or all the keys in a cookie. However, the iterator, when invoked on a cookie that does not have keys, does not execute. To avoid this, you can first use the .HasKeys syntax to check whether a cookie has nay keys. This is demonstrated in the following example.

<%
If not cookie.Has Keys then
'Set the value of the cookie
Response.Cookies(cookie)=""
else
'set the value for each key in the cooke collection
For each key in Response.Cookies(Cookie)
Response.Cookies(cookie)(key) = " "
Next key
%>

Example

The following examples demonstrate how you can set value for a cookie and assign values to its attributes.

<%
Reponse.Cookies("Type") = "Chocolate chip"
Reponse.Cookies("type").Expires=#July 31, 1998#
Reponse.Cookies("type").Domain="kidslovepc.com"
Reponse.Cookies("type").path="/home/"
Reponse.Cookies("type").Secure=FALSE
%>

ASP tutorial
What is ASP
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VBScript or JScript
ClientSide vs ServerSide scripting
ASP execution order
Dealing with Form
More Form example
Variable &Variant
String
Local variable
Global variable
Arrays
Use if_then_else
Use Select Case
For_Next loop
Do_while loop
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Request Object
QueryString
Count Keyword
Using QueryString
Application, Method, Events
Create Virtual Directory
Save array in Application
Session, Method, Events
Using Cookie
Server Object
Ad Rotator
Content Linker
Browser
Dictionary object
Filesystemobject Object

 

 

 

 

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