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ASP Quick Reference

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

Basic Syntax

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

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" %>
<html>
<body>

<%
....
%>

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 <html> 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
<object> declarations
TypeLibrary declarations
the #include directive

Application and Session Events

In Global.asa you can tell the application and session objects what to do when the application/session starts and what to do when the application/session ends. The code for this is placed in event handlers. Note: We do not use <% and %>, to insert scripts in the Global.asa file, we have to put the subroutines inside the HTML <script> tag:

<object> Declarations

It is also possible to create objects with session or application scope in Global.asa by using the <object> tag. Note: The <object> tag should be outside the <script> tag!

Syntax:

TypeLibrary Declarations

A TypeLibrary is a container for the contents of a DLL file corresponding to a COM object. By including a call to the TypeLibrary in the Global.asa file, the constants of the COM object can be accessed, and errors can be better reported by the ASP code. If your Web application relies on COM objects that have declared data types in type libraries, you can declare the type libraries in Global.asa.

Syntax:

The Session Object

The Session object is used to store information about, or change settings for a user session. Variables stored in the Session object hold information about one single user, and are available to all pages in one application.

Collections

Contents - Holds every item added to the session with script commands
StaticObjects - Holds every object added to the session with the <object> tag, and a given session
Contents.Remove(item/index) - Deletes an item from the Contents collection
Contents.RemoveAll() - Deletes every item from the Contents collection

Properties

CodePage - Sets the code page that will be used to display dynamic content
LCID - Sets the locale identifier that will be used to display dynamic content
SessionID - Returns the session id
Timeout - Sets the timeout for the session

Method

Abandon - Kills every object in a session object

Application Object

A group of ASP files that work together to perform some purpose is called an application. The Application object in ASP is used to tie these files together. All users share one Application object. The Application object should hold information that will be used by many pages in the application (like database connection information).

Collections

Contents - Holds every item added to the application with script commands
StaticObjects - Holds every object added to the application with the <object> tag
Contents.Remove - Deletes an item from a collection
Contents.RemoveAll - Deletes every item from a collection

Methods

Lock - Prevents a user from changing the application object properties
Unlock - Allows a user to change the application object properties

The Response Object

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

Collection

Cookies(name) - Sets a cookie value. If the cookie does not exist, it will be created, and take the value that is specified

Properties

Buffer - Whether to buffer the output or not. When the output is buffered, the server will hold back the response until all of the server scripts have been processed, or until the script calls the Flush or End method. If this property is set, it should be before the <html> tag in the ASP file
CacheControl - Sets whether proxy servers can cache the output or not. When set to Public, the output can be cached by a proxy server
Charset(charset_name) - Sets the name of the character set (like "ISO8859-1") to the content type header
ContentType - Sets the HTTP content type (like "text/html", "image/gif", "image/jpeg", "text/plain"). Default is "text/html"
Expires - Sets how long 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 - Checks if the client is still connected to the server
Pics(pics_label) - Adds a value to the pics label response header
Status - Specifies the value of the status line

Methods

AddHeader(name, value) - Adds an HTML header with a specified value
AppendToLog string - Adds a string to the end of the server log entry
BinaryWrite(data_to_write) - Writes the given information without any character-set conversion
Clear - Clears the buffered output. Use this method to handle errors. If Response.Buffer is not set to true, this method will cause a run-time error
End - Stops processing the script, and return the current result
Flush - Sends buffered output immediately. If Response.Buffer is not set to true, this method will cause a run-time error
Redirect(url) - Redirects the user to another url
Write(data_to_write) - Writes a text to the user

Request Object

When a browser asks for a page from a server, it is called a request. The Request Object is used to get information from the user.

Collection

ClientCertificate - Holds field values stored in the client certificate
Cookies(name) - Holds cookie values
Form(element_name) - Holds form (input) values. The form must use the post method
QueryString(variable_name) - Holds variable values in the query string
ServerVariables(server_variable) - Holds server variable values

Property

TotalBytes - Holds the total number of bytes the client is sending in the body of the request

Method

BinaryRead - Fetches the data that is sent to the server from the client as part of a post request

Server Object

The Server Object is used to access properties and methods on the server.

Property

ScriptTimeout - Sets how long a script can run before it is terminated

Method

CreateObject(type_of_object) - Creates an instance of an object
Execute(path) - Executes an ASP file from inside another ASP file. After executing the called ASP file, the control is returned to the original ASP file
GetLastError() - Returns an ASPError object that will describe the error that occurred
HTMLEncode(string) - Applies HTML encoding to a string
MapPath(path) - Maps a relative or virtual path to a physical path
Transfer(path) - Sends all of the state information to another ASP file for processing. After the transfer, procedural control is not returned to the original ASP file
URLEncode(string) - Applies URL encoding rules to a string

Source : http://www.w3schools.com/asp/asp_quickref.asp