This document discusses client-side and server-side scripting. It defines scripting languages as programming languages that automate tasks through scripts. Client-side scripting runs in the user's browser and can access local files/settings, while server-side scripting runs on the web server and can access databases and file systems. Examples of client-side languages include JavaScript and VBScript, while common server-side languages include PHP, Python, and Perl. The document outlines advantages of both like speed (client faster, server can access more resources) and disadvantages like security risks for server-side scripts.

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4. Clientside scripting
and
Serverside scripting
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5. Scripting Languages
 A scripting language is a programming language that
supports the writing of scripts
“A script is a program that automates the execution of tasks
which could alternatively be executed one-by-one by a
human operator”
 Where to use scripts?
Software applications(Python,Perl,Ruby etc)
Web pages (Javascript,VB script,php etc)

6. FEATURES
Ease of use: scripting languages are intended to be very
fast to pick up
Interpreted from source code: to give the fastest
turnaround between the scripting phase and the
execution phase

7. EXECUTION
 Scripts are written and executed on-the-fly
Without compiling
Without linking
 Differences with the software environment code
Scripts are created and/or modified by the person who
executes them
Software code is compiled and distributed in machine code
form; the user does not access to it and modify it
 A script is used in order to extend application functionalities,
or to execute simple tasks by using pre-existing components

8. ADVANTAGES OF SCRIPTING
 Easy to learn and use
 Minimum programming knowledge or
experience required
 Allow complex tasks to be performed in
relatively few steps
 Allow simple creation and editing in a variety
of text editors
 Allow the addition of dynamic and interactive
activities to web pages
 Editing and running code is fast.

9. SCRIPTING
SCRIPTING
CLIENT-SIDE SEVER-SIDE

10. SERVER SIDE SCRIPTING
Server side scripting is used to create dynamic pages
based a number of conditions when the users browser
makes a request to the server
The Web Server executes the server side scripting that
produces the page to be sent to the browser.
 Server executes server-side scripts to send out a page
but it does not execute client-side scripts.

11. SERVER SIDE SCRIPTING
Server side scripting is used to connect to the databases
that reside on the web server.
Server side scripting can access the file system residing
at the web server.
Response from a server-side script is slower as
compared to a client-side script because the scripts are
processed on the remote computer.

12. SERVER SIDE SCRIPTING-advantages
1. It does not require the user to download plugins like Java or
Flash (client-side scripting).
2. Your scripts are hidden from view. Users only see the HTML
output, even when they view the source.

13. Disadvantages
The scripts can be used by attackers to gain access to the
server. Because the scripts respond to URL input,
changing the URL to something that exploits a security
hole can give the user server access, sometimes even as
root.

14. CLIENT-SIDE SCRIPTING
 Client side scripting is used when the users browser
already has all the code and the page is altered on the
basis of the users input.
 The Web Browser executes the client side scripting
that resides at the user’s computer.

15. CLIENT-SIDE SCRIPTING
 The browser receives the page sent by the server
and executes the client-side scripts.
 Client side scripting cannot be used to connect to
the databases on the web server.
 Client side scripting can’t access the file system
that resides at the web server.

16. CLIENT-SIDE SCRIPTING
 The files and settings that are local at the user’s
computer can be accessed using Client side scripting.
 Response from a client-side script is faster as
compared to a server-side script because the scripts
are processed on the local computer.
 Examples of Client side scripting languages :
Javascript, VB script, etc.

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