Introduction ASP

INTERNET
PROGRAMMING
ACTIVE SERVER PAGE
(ASP)

INTRODUCTION
SCRIPT
PROCESSING

Client Side
Meaning: Processing
that are conducted at
the user’s
computer(browser)

Server Side
Hardware

Software
Script used: JavaScript

Web server  Internet
Information
Services(IIS)

Script used: ASP  VBscript

CLIENT SIDE
PROCESSING

Advantages

Disadvantages

Faster to display
output since workload
is distributed to user’s
PC

Cannot retain global
data

Customizeable output
– personalized
experienced

Cannot store data
from user into
database

SERVER SIDE
PROCESSING

Advantages

Data from user can be stored
into database. Eg: order,
reservation, feedback.

Web server controls user’s
browsing selection. Eg: If
certain pages are off-limit to
ordinary users, server-side
scripting can be employed to
block the pages from being
viewed by the user.

Disadvantages

The processing is centered at
the server  will put burden
of processing on the server
instead of the client.

IMPLEMENTING SERVER-SIDE
SCRIPTING (ISS)
• Web browser
request an ASP file
from the server

IIS

ASP
MODULE

IIS sends plain
HTML file to be
displayed in the
web browser

WWW
services

FTP
services

Gopher
Services

• Provide simple
document(textbase)over the
internet

a web page that is
processed by a web
server

a program that
runs inside a web
server (IIS/PWS)

What
is ASP

a Microsoft
Technology
Scripts in an ASP
file are executed
on the server

ISI
is Internet
Information
Services comes
as a free
component with
Windows 2000 &
Windows NT 4.0
option pack

PWS
is Personal
Web Page, a
smaller scale
version but
fully function
like IIS

JavaScript vs. VBScript
JavaScript is
larger and
more complex
language than
VBScript

JavaScript is, in
some ways, more
powerful than
VBScript

JS is an open
protocol. VBScript
is not

JavaScript
vs.
VBScript

JavaScript is more aware of
HTML than VBScript and has
numerous formatting and
parsing methods for creating
and analyzing HTML tags

JS is case
sensitive.
VBScript is
not

Basic ASP Scripting Style
It begins with
(for JavaScript)
<%@language=
JavaScript%>

we must put tag

<%…………%>
and start writing
code between
the tags

Server side scripting is
a script that is
executed by the web
server, then the results
of which are passed on
to the calling client

STYLE OF WRITING SCRIPTS

indicate inline server
side script in your page
by placng the
programming
statements between the
following tags <% %>

WRITING
INLINE
SCRIPTS
server side scripting
engine in the order that
it appears in the ASP
page executes the script

INTERPERSING
INLINE
SCRIPTS

intersperse inline
script within an ASP

The script is
executed in the
order in which it is
encountered

Working
with ASP
Object
Response object

Server object

Use to access
information
passed by HTTP
requestc

Use to access methods
and properties on the
server

Request object
Used to control the
information sent to
the client

Analogy
The best way to understand these two objects is to think of a
telephone call.
When u place a call, u are requesting that someone on the
other end of the line pick up the phone.
When that person answers the phone, he/she issues a response
to your request (the ringing phone).

Depending on what the person says, you process the results of
your request by taking specific actions depending on whom you
are talking to and for what purpose.

Request Object Collection
Client Certificate

• User certificate is required for
access to the page

Cookies

• Cookies are sent to the server for
examination

Form

• Takes all values passed by html form

QueryString

• Makes available to the web server all
values contained

Server Variables

• Makes available all the HTTP header values
as sent by the user with the request.

Introduction ASP

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