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ASP Quick Reference

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Basic Syntax

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

<html>
<body>
<% response.write("I am Vyom!") %>
</body>
</html>

ASP uses VBScript as the default language. To use another scripting language, insert a language specification at the top of the ASP page:

<%@ language="javascript" %>
<html>
<body>

<%
....
%>


A D V E R T I S E M E N T



Forms and User Input

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

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

ASP Cookies

To identify a user,a cookie is often used. A cookie is a small t ext file that is stored on clientmachine that is embeded by the server . Each time the same computer requests a page with a browser, it will send the cookie too..

To create cookies,the Response.Cookies command is used :

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

Note: BEFORE the <html>,the Response.Cookies command must appear tag!

To retrieve a cookie value,the "Request.Cookies" command is used :

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




Including Files

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

Syntax:

<!--#include virtual="somefile.inc"-->
or
<!--#include file ="somefile.inc"-->

To indicate a path beginning with a virtual directory,use the virtual keyword. The following line would insert the contents of "header.inc"if a file named "header.inc" resides in a virtual directory named /html:

<!-- #include virtual ="/html/header.inc" -->

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

<!-- #include file ="headers\header.inc" -->

To include a file from a higher-level directory,use the file keyword with the syntax (..\) .




Global.asa

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

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

The Global.asa file can contain only the following:

  • Session events
  • Application events
  • <object> declarations 
  • TypeLibrary declarations
  • the #include directive

Application and Session Events

when the application/session starts or application/session ends ,it is necessary to tell the application and session objects in Glogal.asa about the work to be done. The code for this is placed in event handlers. Note: To insert scripts in the Global.asa file, we have to put the subroutines inside the HTML <script> tag,we do not use <% and %>:

<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

By using the <object> tag,it is also possible to create objects with session or application scope in Global.asa. 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

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

Syntax:

 <!--METADATA TYPE="TypeLib"
file="filename"
uuid="typelibraryuuid"
version="versionnumber"
lcid="localeid"
-->




The Session Object

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

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

An application may be a group of ASP files on the Web. To achieve some ourpose group of ASP file work together. In ASP ,The Application object is used to tie these files together.To store and access variables from any page, just like the Session object,the Application object is used. The difference is while with Sessions there is one Session object for EACH user but there is one Application object for ALL users that can be shared. In a particular application (like database connection information),the Application object should hold information that will be used by many pages .

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


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