Object Model Introduction - E-Commerce - Lecture Slides, Slides of Fundamentals of E-Commerce

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Server-Side Web Programming

with Active Server Pages

Basic ASP Output

ASP Object Model Introduction Client

ServerObject Server

Application

Object SessionObject

Response Object^ Request Object Object Context Object

ASP Processing

-^

IIS receives HTTP request from client.

-^

IIS retrieves files from disk or memory.

-^

If .asp or .asa file, passed to ASP.dll

-^

Perform pre-processing directives (scriptinglanguages, transactions)

-^

ASP.dll checks syntax (IIS 5)

-^

ASP.dll interprets code and renders content

-^

ASP passes output to IIS, which passes to client.

Response Object Overview

• Definition
  • The response object provides various facilitiesfor sending content to the client
    • Example
      • Create a paragraph that says Moo!

Response.Write "

Moo!

"

• Create the expiration meta element to expire in5 minutes.

Response.expires = 5

Demo - 1

"Hello World" <%@ language=VBScript

Hello World<%

Response.Write "Hello World"

%>

language=VBScript

<% Dim

I^

'Loop

Counter

Dim

iSum

'Sum

of

the

numbers

%> Sums<

/title

"

&^

CSTR(I)

&^

""

iSum

=^

iSum

+^

I

Nextresponse.write

""

&^

CSTR(iSum)

&^

""

%>

Flow Control

Response.End•^

Stop any further processing of page and send thecurrent buffer to the client. Response.Clear•^

Clear the existing buffer contents. Nothing sent toclient. Response.Flush•^

Send the current buffer to the client now.

Flow Control

Response.Redirect•^

Redirects the client's request to another URL.

-^

MUST use buffering (response.buffer=true) to usethis method.

-^

Note this sends a HTTP response to client.

-^

IIS 5 has new methods for dealing with this.

Response.Redirect

"http://valtara.com"

Cookies Collection Introduction • We will discuss this in detail in another class.• A cookie is a small piece of information the servercan write to and read from the client. It is handy toimplement visitor identity and preferences.• The cookies collection of the response object is usedto CREATE/UPDATE cookies on the client.• If the client does not accept cookies, the informationis discarded by the client.• The Request object has a complementary object toFETCH cookies from the client.

ASP Template

<%@ language=VBScript

%>

<%^

option explicit

%>

<% 'Server-side includes go here %><%'Filename:'Purpose:'Arguments:'Author:'Revised:'Declarations and bufferingConstantsDimsInitial values%>Title