A Brief Guide on JavaScript Programming Language.
                     A Brief Guide on JavaScript 
Programming Language
2
What is JavaScript ?
• JavaScript is a dynamic computer 
programming language. 
• It is lightweight and most used as a part 
of web pages, whose implementations 
allow client-side script to interact with 
the user and make dynamic pages. 
• It is an interpreted programming 
language with object-oriented 
capabilities.
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Specifications
1. JavaScript is a lightweight, interpreted 
programming language.
2. Designed for creating network-centric 
applications.
3. Complementary to and integrated with 
Java.
4. Complementary to and integrated with 
HTML.
5. Open and cross-platform
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Client-Side JavaScript
• Client-side JavaScript is the most 
common form of the language. The 
script should be included in or 
referenced by an HTML document for 
the code to be interpreted by the 
browser.
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Advantages of JavaScript
• Less server interaction − You can 
validate user input before sending the 
page off to the server. This saves server 
traffic, which means less load on your 
server.
• Immediate feedback to the visitors 
− They don't have to wait for a page 
reload to see if they have forgotten to 
enter something.
Source: www.tutorialspoint.com
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Advantages of JavaScript Cont.
• Increased interactivity − You can 
create interfaces that react when the 
user hovers over them with a mouse or 
activates them via the keyboard.
• Richer interfaces − You can use 
JavaScript to include such items as drag-
and-drop components and sliders to give 
a Rich Interface to your site visitors.
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Limitations of JavaScript
1. Client-side JavaScript does not allow the 
reading or writing of files. This has been 
kept for security reason.
2. JavaScript cannot be used for 
networking applications because there is 
no such support available.
Source: www.tutorialspoint.com
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JavaScript Development Tools
1. Microsoft FrontPage − Microsoft has 
developed a popular HTML editor called 
FrontPage.
2. Macromedia Dreamweaver MX − 
Macromedia Dreamweaver MX is a very 
popular HTML and JavaScript editor in 
the professional web development 
crowd.
3. Macromedia HomeSite 5 − HomeSite 5 
is a well-liked HTML and JavaScript 
editor from Macromedia that can be 
used to manage personal websites 
effectively.
Source: www.tutorialspoint.com
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Important attributes 
1. Language − This attribute specifies 
what scripting language you are using. 
Typically, its value will be javascript. 
2. Type − This attribute is what is now 
recommended to indicate the scripting 
language in use and its value should be 
set to "text/javascript".
Source: www.tutorialspoint.com
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How Does JavaScript Work?
1. JavaScript is either embedded into a 
web page or else it’s included in a .js 
file. JavaScript is also a “client-side” 
language, which is a fancy way of saying 
that it gets downloaded to site visitors’ 
computers, then processed.
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How do you add JavaScript to a 
website?
CSS:
 
CSS goes here

JavaScript:

JavaScript code goes here

Source: skillcrush.com