What is JavaScript?

By Jubayer -

Not a full programming language like Java or C++
•core language has no graphics, no file handling, no networking

Not a subset of Java -syntactically similar but:

•loose data typing
•object based not strictly object oriented
•although inheritance is possible

Not simple -easy to get started but large and complex
•client-side code is interpreted by the browser
•its scope is restricted to the browser
•cannot carry a malicious payload


Typical Uses

GUI enhancement

•rollovers images
•pull-down menus
•browser sniffing to adjust page layout

Techniques to reduce the load on the server

•validating input before sending to a server-side program
•shopping carts

Mini-applications
•calculators, calendars

Animation

Asynchronous applications
•AJAX
Many of the above require DHTML
•Dynamic HyperText Markup Language
•combination of JavaScript & HTML & CSS & DOM

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