EME 6207 – Tech Ed: Java vs Java Script

Sep 15th, 2016 at 1:52 am

Textbook Reference(s):

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What is JavaScript?

JavaScript’s official name is ECMAScript.
ECMAScript is developed and maintained by the ECMA organization.
ECMA-262 is the official JavaScript standard.
The language was invented by Brendan Eich at Netscape (with Navigator 2.0), and has appeared in all Netscape and Microsoft browsers since 1996.
The development of ECMA-262 started in 1996, and the first edition of was adopted by the ECMA General Assembly in June 1997.
The standard was approved as an international ISO (ISO/IEC 16262) standard in 1998.
The development of the standard is still in progress. This makes javascript programming a bit of a soft disciplin
Java and JavaScript are not the same thing

JavaScript was designed to add interactivity to HTML pages
JavaScript is a scripting language
A scripting language is a language that controls a program (which is written in a programming language)
JavaScript is can be embedded into HTML pages or linked like a CSS file
JavaScript is an interpretive language (means that scripts execute without preliminary compilation)
Everyone can use JavaScript without purchasing a license
Javascript is a client side language. All of the processing happens on the user’s computer and not on the server. Interaction with the server is done in the context of the user.

Java and JavaScript are not the same!
Java and JavaScript are two completely different languages in both concept and design
Java (developed by Sun Microsystems) is a powerful and much more complex programming language – in the same category as C and C++.
Java has evolved to being the most common language used by programmers today to develop server side applications.

JavaScript gives HTML designers a programming tool – HTML authors are normally not programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can put small “snippets” of code into their HTML pages
JavaScript can put dynamic text into an HTML page – A JavaScript statement like this: document.write(“” + name + “”) can write a variable text into an HTML page
JavaScript can react to events – A JavaScript can be set to execute when something happens, like when a page has finished loading or when a user clicks on an HTML element
JavaScript can read and write HTML elements – A JavaScript can read and change the content of an HTML element
JavaScript can be used to validate data – A JavaScript can be used to validate form data before it is submitted to a server. This saves the server from extra processing
JavaScript can be used to detect the visitor’s browser – A JavaScript can be used to detect the visitor’s browser, and – depending on the browser – load another page specifically designed for that browser
JavaScript can be used to create cookies – A JavaScript can be used to store and retrieve information on the visitor’s computer in between pages loading

Do This:

Visit the tutorials at 3Schools.com. When you are satisfied, go on to the next lesson and tutorials on php

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