The Web Wizards Guide To JavaScript Chapter 1 JavaScript Basics.

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Presentation transcript:

The Web Wizards Guide To JavaScript Chapter 1 JavaScript Basics

Chapter Objectives To discover the reasons to learn JavaScript To learn the history of JavaScript To master the fundamental concepts To become familiar with the Document Object Model

Why Learn JavaScript? Broad support among web browsers Vast libraries of scripts available online Applicable to other host environments Allows use of reusable code libraries Similar syntax to C, C++, and Java Encourages creative problem solving

A Little History Invented by Eich at Netscape in 1995 Became popular with Navigator 3 Jscript: Microsofts competing language ECMA: a standard emerges

Fundamental Concepts Objects: The nouns of the language Instances: incarnations of objects Properties: attributes of objects Values: content for properties Events and Events Handlers Variables: containers for data Arrays: ordered collections of data Methods: The verbs of the language Operators: Assignment versus Comparison Functions: groups of statements

The Document Object Model Internal road map of objects on a web page Hierarchical model of web browser objects Old DOMs for Netscape, Microsoft New browsers use the standard DOM by W3C