Introduction to Javascript By Satyen
This document provides an introduction to JavaScript, including: - JavaScript is a scripting language used to programmatically access computational objects in a host environment and is prototype-based and dynamically typed. - It was initially created by Netscape in 1995 under the name LiveScript and later renamed to JavaScript. - JavaScript implementations have three main parts - the core ECMAScript language, the Document Object Model (DOM) for manipulating HTML/XML documents, and the Browser Object Model (BOM) for accessing browser capabilities. - The DOM represents documents as nodes that can be traversed and manipulated, with levels that have added functionality over time. The BOM allows manipulating browser windows and accessing information about the browser, screen,
Introduction to Javascript By Satyen
- 2. Contents2 What is JavaScript ?
- 7. Browser Object Model (BOM)[email protected]
- 8. What is JavaScript ?3 JavaScriptis an implementation of the ECMAScript language standard.
- 10. It can be characterized as a prototype-based object- oriented scripting language that is dynamic, weakly typed.
- 11. It is a client-side scripting [email protected]
- 12. Brief History4 JavaScript was developed by Brendan Eich of Netscape
- 13. It was initially called LiveScript, then renamed to JavaScript In 1995 Netscape Navigator 2.0 was released with JavaScript 1.0 In 1996 Netscape Navigator 3.0 was released withJavaScript 1.1 Recent release JavaScript 1.8.5 in July, [email protected]
- 14. JavaScript Implementations5 JavaScript implementation is made up of three distinctpart :The Core (ECMAScript)The Document Object Model (DOM)The Browser Object Model (BOM)[email protected]
- 15. ECMAScript6 It can provide core scripting capabilities for a variety ofhost environments, and therefore the core scriptinglanguage is specified, apart from any particular hostenvironment. ECMAScript is simply a description, defining all the properties,methods, and objects of a scripting language. ECMAScript describes following :[email protected]
- 16. DOM7 Document Object Model (DOM) is applicationprogramming interface (API) for HTML as well as XML The DOM maps out an entire page as a documentcomposed of a hierarchy of nodes Each an HTML or XML page is derivative of a [email protected]
- 17. DOM (Contd…)8 DOM Level :
- 18. Level 1 - Map out the structure of document
- 19. Level 2 - Added support for mouse and user interface events, ranges, traversals, and support for CSS through object interface.DOM Views - Interfaces to keep track of the various views of document DOM Events - Interfaces for events
- 20. DOM Style - Interfaces to deal with CSS-based styles
- 21. DOM Traversal and Range - Interfaces to traverse and Manipulate document treeLevel 3 - Added support of methods to load and save documents, methods to validate a document, extended support to XML [email protected]
- 22. BOM9Browser Object Model (BOM) allows access and manipulationof the browser window BOM includes :
- 26. Navigator object, which provides detailed information about the web browser Location object, information about the page loaded in browser Screen object, information about user’s screen resolution Support [email protected]