Page 214 - DCAP408_WEB_PROGRAMMING

Web Programming

Notes When a web browser requests an ASP page, the following steps occur:
 The client locates the web server specified by the first part of the URL(www.something.com)
 The client then requests the ASP page specified by the second part of the URL(/default.asp)
 The web server reads the ASP file and processes the code.

 After the ASP page has been completely processed by the web server, the output is sent in
HTML format to t==he client.
 The client receives the HTML sent by the server and renders it for the user.

Figure 8.2

Client requests ASP file
Server locates
the ASP file on
Server the hard drive
and, removing
Client
all ASP script
and replacing it
with HTML text
passes it

Server returns HTML text to client

8.3.1 How ASP differs from Client-Side Scripting Technologies?

Client-Side Scripting is programmatic code in an HTML file that runs on the browser. It is
denoted by <SCRIPT> HTML tag. It is commonly written using the JavaScript programming
language due to the fact that Netscape Navigator only supports the JavaScript scripting language
for Client-Side scripting. ASP scripts are server -side scripts.
While using ASP, its code exists on the server only. ASP code, which is surrounded by the <% and
%> delimiters is processed completely on the server. The client cannot access this ASP code.

Notes Note that the Server-side script is also used to create applications which need a
broad reach: applications that might be accessed by many different types of browsers,
each with different capabilities.

Differences

A Client-Side script is processed only by the client. It is the client’s responsibility to execute all
Client-Side scripts on the other hand; Server-Side scripts are processed completely on the web
server. The client does not receive any code from server side scripts rather the client receives just
the output of the Server-Side scripts.
Client-Side scripts and Server-Side scripts cannot contract with one another because the Client-
Side script are executed on the client, after the service side scripts have finished processing
completely.

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