Beginners IV

ASP Response Object

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The ASP Response object is used to send output to the user from the server.

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Response Object

The ASP Response object is used to send output to the user from the server. Its collections, properties, and methods are described below:

Collections

Collection	Description
Cookies	Sets a cookie value. If the cookie does not exist, it will be created, and take the value that is specified

Properties

Property	Description
Buffer	Specifies whether to buffer the page output or not
CacheControl	Sets whether a proxy server can cache the output generated by ASP or not
Charset	Appends the name of a character-set to the content-type header in the Response object
ContentType	Sets the HTTP content type for the Response object
Expires	Sets how long (in minutes) a page will be cached on a browser before it expires
ExpiresAbsolute	Sets a date and time when a page cached on a browser will expire
IsClientConnected	Indicates if the client has disconnected from the server
Pics	Appends a value to the PICS label response header
Status	Specifies the value of the status line returned by the server

Methods

Method	Description
AddHeader	Adds a new HTTP header and a value to the HTTP response
AppendToLog	Adds a string to the end of the server log entry
BinaryWrite	Writes data directly to the output without any character conversion
Clear	Clears any buffered HTML output
End	Stops processing a script, and returns the current result
Flush	Sends buffered HTML output immediately
Redirect	Redirects the user to a different URL
Write	Writes a specified string to the output

ASP Request Object

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The ASP Request object is used to get information from the user.

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QueryString Collection Examples

Send query information when a user clicks on a link
This example demonstrates how to send some extra query information to a page within a link, and retrieve that information on the destination page (which is, in this example, the same page).

A QueryString collection in its simplest use
This example demonstrates how the QueryString collection retrieves the values from a form. The form uses the GET method, which means that the information sent is visible to everybody (in the address field). The GET method also limits the amount of information that can be sent.

How to use information from forms
This example demonstrates how to use the values retrieved from a form. We use the QueryString collection. The form uses the get method.

More information from a form
This example demonstrates what the QueryString contains if several input fields have the same name. It shows how to separate input fields with equal names from each other. It also shows how to use the Count keyword to count the "name" property. The form uses the get method.

Form Collection Examples

A form collection in its simplest use
This example demonstrates how the Form collection retrieves the values from a form. The form uses the POST method, which means that the information sent is invisible to others, and it has no limits (you can send a large amount of information).

How to use information from forms
This example demonstrates how to use the values retrieved from a form. We use the Form collection. The form uses the post method.

More information from a form
This example demonstrates what the Form collection contains if several input fields have the same name. It shows how to separate input fields with equal names from each other. It also shows how to use the Count keyword to count the "name" property. The form uses the post method.

A form with radio buttons
This example demonstrates how to interact with the user through radio buttons, with the Form collection. The form uses the post method.

A form with checkboxes
This example demonstrates how to interact with the user through checkboxes, with the Form collection. The form uses the post method.

Other Examples

Get the server variables
This example demonstrates how to find out the visitors (yours) browser type, IP address, and more with the ServerVariables collection.

Create a welcome cookie
This example demonstrates how to create a Welcome Cookie with the Cookies Collection.

Find the total number of bytes the user sent
This example demonstrates how to use the TotalBytes property to find out the total number of bytes the user sent in the Request object.

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Request Object

When a browser asks for a page from a server, it is called a request. The ASP Request object is used to get information from the user. Its collections, properties, and methods are described below:

Collections

Collection	Description
ClientCertificate	Contains all the field values stored in the client certificate
Cookies	Contains all the cookie values sent in a HTTP request
Form	Contains all the form (input) values from a form that uses the post method
QueryString	Contains all the variable values in a HTTP query string
ServerVariables	Contains all the server variable values

Properties

Property	Description
TotalBytes	Returns the total number of bytes the client sent in the body of the request

Methods

Method	Description
BinaryRead	Retrieves the data sent to the server from the client as part of a post request and stores it in a safe array

Your name:

<%
dim fname
fname=Request.QueryString("fname")
If fname<>"" Then
Response.Write("Hello " & fname & "!
")
Response.Write("How are you today?")
End If
%>

<%
If Response.IsClientConnected=true then
Response.Write("The user is still connected!")
else
Response.Write("The user is not connected!")
end if
%>

ASP Quick Reference

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ASP Quick Reference from W3Schools. Print it, and fold it in your pocket.

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Basic Syntax

ASP scripts are surrounded by <% and %>. To write some output to a browser:

<% response.write("Hello World!") %>

The default language in ASP is VBScript. To use another scripting language, insert a language specification at the top of the ASP page:

<%@ language="javascript" %>

<%
....
%>

Forms and User Input

Request.QueryString is used to collect values in a form with method="get". Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's address bar) and has limits on the amount of information to send.

Request.Form is used to collect values in a form with method="post". Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.

ASP Cookies

A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests for a page with a browser, it will send the cookie too.

The Response.Cookies command is used to create cookies:

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

Note: The Response.Cookies command must appear BEFORE the tag!

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

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

Including Files

You can insert the content of one ASP file into another ASP file before the server executes it, with the #include directive. The #include directive is used to create functions, headers, footers, or elements that will be reused on multiple pages

Syntax:

or

Use the virtual keyword to indicate a path beginning with a virtual directory. If a file named "header.inc" resides in a virtual directory named /html, the following line would insert the contents of "header.inc":

Use the file keyword to indicate a relative path. A relative path begins with the directory that contains the including file. If you have a file in the html directory, and the file "header.inc" resides in html\headers, the following line would insert "header.inc" in your file:

Use the file keyword with the syntax (..\) to include a file from a higher-level directory.

Global.asa

The Global.asa file is an optional file that can contain declarations of objects, variables, and methods that can be accessed by every page in an ASP application.

Note: The Global.asa file must be stored in the root directory of the ASP application, and each application can only have one Global.asa file.

The Global.asa file can contain only the following:

Application events

Session events