Chapter 6
JavaScript: Introduction to Scripting
Introduction
In the first five chapters, we introduced the
Internet and Web, web browsers, Web 2.0, XHTML and Cascading Style Sheets
(CSS). In this chapter, we begin our introduction to the JavaScript1 scripting language, which facilitates a disciplined approach to designing computer
programs that enhance the functionality and appearance of web pages.
In Chapters
6–11, we present a detailed discussion of JavaScript—the de facto stan-dard client-side scripting language for web-based
applications due to its highly portable nature. Our treatment of JavaScript
serves two purposes—it introduces client-side scripting (used in Chapters
6–13), which makes web pages more dynamic and interactive, and it provides the
programming foundation for the more complex server-side scripting presented
later in the book.
We now
introduce JavaScript programming and present examples that illustrate sev-eral
important features of JavaScript. Each example is carefully analyzed one line
at a time. In Chapters 7–8, we present a detailed treatment of program
development and program control in JavaScript.
Before you can run code examples with JavaScript
on your computer, you may need to change your browser’s security settings. By
default, Internet Explorer 7 prevents scripts on your local computer from
running, displaying a yellow warning bar at the top of the window instead. To
allow scripts to run in files on your computer, select Internet Options from
the Tools menu. Click the Advanced tab and scroll down to the Security section
of the Settings list. Check the box labeled Allow active content to run in files on My Computer (Fig. 6.1). Click OK and restart Internet Explorer. XHTML documents on your own computer that contain JavaScript code will now run properly. Firefox has JavaScript enabled by default.
Related Topics
Copyright © 2018-2020 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.