ASP Quick Reference
ASP Quick Reference
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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:
<html>
<body>
<%
response.write("Hello World!")
%>
</body>
</html>
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:
<!--#include virtual="somefile.inc"-->
or
<!--#include file ="somefile.inc"-->
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":
<!-- #include virtual ="/html/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:
<!-- #include file ="headers\header.inc" -->
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 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:
<script language="vbscript" runat="server">
sub Application_OnStart
' some code
end sub
sub Application_OnEnd
' some code
end sub
sub Session_OnStart
' some code
end sub
sub Session_OnEnd
' some code
end sub
</script>
<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:
<object runat="server" scope="scope" id="id"
{progid="progID"|classid="classID"}>
.......
</object>
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:
<!--METADATA TYPE="TypeLib"
file="filename"
uuid="typelibraryuuid"
version="versionnumber"
lcid="localeid"
-->
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
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
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