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Introduction
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Netscape introduced JavaScript with great fanfare in December 1995 as an open, cross-platform object scripting language It was billed as the perfect complement to the much-anticipated Java programming language, since the two languages can communicate with each other inside a browser window Today, almost 10 years later, JavaScript is ubiquitous across the Internet landscape It is estimated that 25 percent of web pages on the Internet today contain JavaScript code Some of them use that code to perform some very basic scripting effects, such as controlling mouse rollovers and setting the browser status bar Many of them contain complex dynamic menus and automated forms No other scripting language comes close to JavaScript s domination of the web browser environment The key to JavaScript s success has been its ease of use For instance, a single JavaScript statement can create an interesting browser effect, and a small handful of statements is all that s required for a completely interactive browser environment You don t even need any special tools to create these effects A simple text editor, such as Windows Notepad, is all that is required If you can create HTML web pages, you have all the tools you ll need to get started With the impending release of version 20, JavaScript will finally be usable side by side with programming languages such as C++ and Visual Basic For instance, Microsoft has included a version of JavaScript 20, called JScript NET, in its popular NET programming environment JScript NET can access almost all the NET Framework classes and can be used to create Windows Forms applications that run on your desktop In fact, the next new word processor you use may be coded entirely in JavaScript
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This book is designed to help anyone interested in adding elements of interactivity to their personal web pages Some experience with a PC is required, as we will not cover how to access the Internet or how to use a web browser You don t have to be an HTML expert, although it will help if you have some experience with that language When encountering new HTML for the first time, I will briefly explain what s going on, but always in the context of JavaScript
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How to Do Everything with JavaScript
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How to Do Everything with JavaScript is organized into three main sections Each section focuses on a different set of JavaScript skills: Part I s 1 5 take you through the basics of JavaScript This part covers the fundamental aspects of the programming languages, including statements, objects, and data types Part II s 6 12 show you how to integrate JavaScript into a web site This part looks at using JavaScript with the Document Object Model, browser events, frames, and web forms Part III s 13 15 cover advanced JavaScript topics This part deals with debugging a JavaScript program, errorproofing code, and communicating with other objects embedded in a web page Often, the best way to learn a programming language like JavaScript is to play around with it Don t be afraid to try some of the JavaScript examples in the book yourself Type them in and change them to something of your own design you will gain a better understanding of how things work Ask yourself, What will happen if I do this instead Then go ahead and try it nothing can go seriously wrong The worst that can happen is that something you try doesn t work And that s OK Simply shrug your shoulders and try again
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Part I
Learn JavaScript Basics
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1
Prepare to Program in JavaScript
How to Do Everything with JavaScript
How to
Choose a development environment Learn what JavaScript can and cannot do Decide which version of JavaScript to use Test JavaScript programs using HTML Use the HTML <script> tag Create a JavaScript template with Microsoft Notepad Communicate with the user
Behind every successful movie, there is a person behind the scenes who governs the interaction of actors, camera operators, writers, and other crew members This is the director, and although you don t usually see this person on screen, the quality of the movie rests on the success of his or her efforts Well, JavaScript is the behind-the-scenes director of many Internet web sites Its job is to govern the interaction of objects and events so that the two interact seamlessly with one another Generally, the more complex the web site, the more it relies on JavaScript to direct Lights! Camera! Browser! Action! Perhaps the first question that needs to be asked about JavaScript is, what is it The simplest answer is that JavaScript is a simple programming language, used mainly to bring interactivity to web sites It is often called a scripting language, hence the name, but it also has a nonscripting form A script, in programming terminology, is a program that does not need to be compiled in order to run Scripts tend to perform a specific task and then exit, and do not generally have a graphical user interface (GUI) to speak of JavaScript, Perl, and VBScript are the most common scripting languages used by Internet web sites
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