Week 8: INTRINSIC ASP OBJECT

1
Week 8 INTRINSIC ASP OBJECT

• 1.1  Introduction
• Basically, ASP has seven objects, called
  intrinsic objects are
• Response Object Used to send info. To client
• Request Object Used to retrieve info. Included
  with the request from the client
• Server Object Used communicate with the server
• Application Object Used to store (cache) info.
  About your application
• Session Object Used to cache info. about a
  specific browser instance (which usually, but not
  always, corresponds to a single user)
• ObjectContext Object Used to initiate and
  control transactions and create new objects
  through Microsoft Transaction Server (MTS)
• ASPError Object Used to obtain info. about
  errors that occur while the the ASP engine
  processes a script.

2
Week 8 INTRINSIC ASP OBJECT

• The Response Object (Cont..)
• Used to send output to the client
• This includes sending info. directly to the
  browser, redirecting the browser to another URL
  and setting cookie values.
• The most often used methods of Response object
  are the write method and the redirect method.
• Other methods are AddHeader, AppendToLog,
  BinaryWrite, Clear, End, Flush.
• The Write method sends a string back to the
  calling client, to be written the browser that
  the calling client used to open the Internet
  conversation.

3
Week 8 INTRINSIC ASP OBJECT

• The Response Object (Cont..)
• Example 1
• Response.Write(Hello World)
• Example 2
• Response.Write("ltBgt" "This is my second ASP"
  "lt/Bgt" "ltBRgt")
• Example 3
• var myString Inilah script saya
• Response.Write(myScript)
• Example 4
• var now new Date()
• Response.Write(now)

4
Week 8 INTRINSIC ASP OBJECT

• The Request Object
• The Request Object retrieves the values that the
  client browser passed to the server during an
  HTTP request.
• This includes parameters, passed from an HTML
  form using either the
• POST method or the GET method, cookies and
  client certificates.
• The request object also gives access to binary
  data sent to the server,
• such as file uploads.
• Most of the Request object function is to
  retrieve query data from a
• calling client using the Form, Cookies
  QueryString collection.

5
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• The Request object contains five different
  collections of information
• ClientCertificates contains security
  information
• Cookies contains cookie values sent by the
  browser
• Form contains information the user enters into
  input controls and information your application
  has stored in form variables
• QueryString Contains information sent with the
  URL
• ServerVariables contains information that the
  server automatically parses for every request.

6
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• Some examples of ServerVariables
• Example 1
• Response.Write(Request.ServerVariables("REMOTE_AD
  DR"))
• Example 2
• Response.Write(Request.ServerVariables("HTTP_USER
  _AGENT"))
• Example 3
• Response.Write(Request.ServerVariables("SERVER_PO
  RT"))
• Example 4
• Response.Write(Request.ServerVariables("SERVER_NA
  ME"))
• Example 5
• Response.Write(Request.ServerVariables("SERVER_PR
  OTOCOL"))
• Example 6
• Response.Write(Request.ServerVariables("SERVER_PO
  RT_SECURE"))
• Example 7
• Response.Write(Request.ServerVariables("SERVER_SO
  FTWARE"))

7
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• The Request.QueryString Collection is used for
  passing data between the client and the server
  through the QueryString collection.
• QueryString data is passed in the URL along with
  the request.
•  
• For Example, the URL shown below with 4
  parameters
• http//localhost/learn/query_string.asp?8Azizian
  Sapawi10AliSeman100azlanAbdAziz

8
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• Example, how to pass QueryString (File 1)

lt _at_LanguageJavaScript gt   lthtmlgt ltbodygt lta
href"query_string.asp?ShowQueryStringFalse8Azi
zianSapawi 10AliSeman100azlanAbdAziz"gt
show employeeslt/agt lt/bodygt lt/htmlgt
9
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• Example, how retrieve QueryString Data (file 2)

lt _at_LanguageJavaScript gt lthtmlgt ltbodygt lt var
field, content if (Request.QueryString("ShowQuery
String") "True" )   for (var counter 1
counter lt Request.QueryString.count
counter) field String(Request.QueryStrin
g.key(counter)) content String(Request.QueryS
tring.item(field)) Response.Write(field " "
content "ltbrgt") else Response.Write(
"this link won't show any values")
gt lt/bodygt lt/htmlgt
10
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• The important thing to know are the following
• You separate the query string from the URL with a
  question mark
• You separate names (key) from values with an
  equals sign
• You separate key-value pairs from each other with
  ampersands
• URL data cannot contain spaces you must replace
  spaces with plus signs
• The Request object decodes the data for you
•  

11
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• Working with The Resquest.Form
• HTML form can be used when we are going to submit
  some data to through an ASP.
• When a browser submits form data using the post
  Method, the ASP engine parses the raw HTTP from
  data and stores it in the Request.Form
  collection.
• The form collection, like other ASP collection,
  stores data by key.
• If a key has more than one value, the values are
  stored in indexed form.
• The Request.Form collection has a default Item
  method.

12
Week 8 INTRINSIC ASP OBJECT

• The Request Object (Cont..)
• Example
•  
• ltform action"test1.asp" method"post"gt
• ltinput type"text" name"fname"gtltbrgtltbrgt
• ltinput type"submit" value"submit"gt
• lt/formgt
•  
• lt
•  
• if (Request.Form("fname")!"")
• Response.Write(Request.Form("fname"))
•  
• gt

13
Week 8 INTRINSIC ASP OBJECT

• The Server Object
• Gives high-level access to the server itself.
• The Server object is used to access properties
  and methods on the server.
• Using its properties and methods, we can create
  objects, execute code in other ASP files,
  translate virtual paths to physical paths, and
  perform server-side redirects.
• The most frequently used methods and properties
  is the one that creates an instance of an ActiveX
  component (ADO), Server.CreateObject.
• Other methods apply URL or HTML encoding to
  strings, map virtual paths to physical paths, and
  set the timeout period for a script.

14
Week 8 INTRINSIC ASP OBJECT

• The Server Object (Cont..)
• Using The Server.CreateObject( ) Method to make a
  connection
• One of the most powerful object method in ASP
• To create a connection with server, we can use
  the CreateObject() function
• CreateObject() takes one parameter, a string
  indicating the object to create.
• The string is the object library name and a
  period followed by the object within the object
  library that you want to create.
• The name for the ADO Object Library is ADODB.

15
Week 8 INTRINSIC ASP OBJECT

• The Server Object (Cont..)
• The following code create a connection object
• var Conn
• Conn Server.CreateObject (ADODB.Connection)
•  
• In order to have a viable Connection object and
  live link to a datasource, we use the Open
  Method
• Conn.Open()
• We use the Close Method to disconnect to server
  and connection between the object and the
  datasource.
• Conn.Close()

16
Week 8 INTRINSIC ASP OBJECT

• The Server Object (Cont..)
• Creating Recordset Object using the
  CreateObject() Method.
• Recordset is a distinct object within the ADO
  object library.
• The following code shows how to create recordset
  and assign to a variable
• rs Server.Create.Object(ADODB.Recordset)
• Use Open() Method to make connection active like
• var Conn
• Conn Server.CreateObject (ADODB.Connection)
• rs.Server.CreateObject(ADODB.Recordset)
• sql SELECT FROM table
• rs.Open(sql, Conn)

17
Week 8 INTRINSIC ASP OBJECT

• The Server Object (Cont..)
• Using The Server.MapPath Method
• The MapPath method can convert to a relative
  orvirtual path that is the name of the file or
  folder to the actual physical path where the file
  or folder would be stored on the servers hard
  disk.
• The syntax of the MapPath method is as follow
• Server.MapPath(path)
• Where path specifies the relative or virtual path
  whose location you wish to determine.
• If the path starts with a backward (/) slash, it
  is interpreted as a virtual path and the mapping
  begins at the servers root.

18
Week 8 INTRINSIC ASP OBJECT

• The Server Object (Cont..)
• Example
• Response.Write(Server.MapPath(/default.asp)
• The output would be c\inetpub\wwwroot\default.a
  sp
• If the path does not begin with a slash is
  interpreted as being relative to the folder where
  the current ASP is stored.
• Example
• Response.Write(ServerMapPath(default.asp)
• The output would be c\asp\default.asp

19
Week 8 INTRINSIC ASP OBJECT

• The Session Object
• One of the most advanced object in ASP.
• A session begins when a browser instance requests
  a page in your application, and ends when you
  abandon the session via code (when the session
  times out or if the browser refuses the session
  cookie or etc)
• When a session has requested, the server
  immediately redirects the user to a file called
  global.asa .
• The server generates a cookie header, then runs
  the code (if any) in the Session_OnStart event in
  the global.asa.

20
Week 8 INTRINSIC ASP OBJECT

• The Session Object (Cont..)
• The global.asa file
• The global.asa file can be found in the root
  directory on your web server application
  (normally C\inetpub\wwwroot\global.asa)
• ASP engine will run the code in the global.asa
  file in the following instance
• The application starts (Application_OnStart
  event)
• A session starts (Session_OnStart event)
• A session ends (Session_OnEnd event)
• The application ends (Application_OnEnd event)
•  

21
Week 8 INTRINSIC ASP OBJECT

• The Session Object (Cont..)
• The ASP engine performs applicaton and session
  inialization in a specific order
• The first person request a file from your
  application causes ASP to find the global.asa
  file in the applications root directory. The
  server performs the same steps whether or not the
  global.asa file exists.
• Immediately after it creates the Application
  object, ASP calls the Application_OnStart event
  (if it exists).
• When the Application OnStart event completes, the
  ASP engine creates a new SessionID, writes the
  SessionID cookie header, then creates a new
  Session Object and starts the Sessio.Timeout
  timer.
• Immediately after it creates the new Session
  object, ASP calls the Session OnStart event (If
  it exists)
• When the session times out or you issue a
  Session.Abandon command, the ASP engine calls the
  Session_OnEnd event procedure (if it exists ),
  then destroys the Session object.
• After the ASP engine destroys the last Session
  object, it calls the Application_OnEnd event
  procedure (if it exists)

22
Week 8 INTRINSIC ASP OBJECT

• The Session Object (Cont..)
• The global.asa file is usefull when
• Storing string references that might change
• Cleaning up when a session ends
• Ensuring that all users are out of your site.

23
Week 8 INTRINSIC ASP OBJECT

• The Session Object (Cont..)
• Example
• if (Request.Form("password") selamat")
• if(Session(sesi") "OK")
• Response.Write("session has been
  successfully applied")
• else
• Response.Redirect("session_ex.asp")
• gt
• lthtmlgtltheadgtlt/headgtltbodygt
• ltform action"session_ex.asp" method"post"gt
• ltpgtPassword Please
• ltinput typepassword namepassword gt
• ltinput typesubmit name"toss" value"Submit"gt
• lt/formgt