2: Writing Your Very First Script in Java

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2: Writing Your Very First Script

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Part I: Creating an HTML file

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When you have your script requirements in hand, you re ready to hit the coding slopes! First off, you need to create a Web page You do that by typing HTML code into a text editor and saving that code as a separate file on your computer s hard drive, which I show you how to do in this section Because this book is all about JavaScript not HTML I don t go into great detail about the HTML language Instead, I demonstrate only as much HTML as I need to describe all the wonderful things that you can do with JavaScript If you need a good introduction to HTML, I suggest HTML 4 For Dummies, 4th Edition, by Ed Tittel and Natanya Pitts (Wiley Publishing, Inc) Throughout this book, I use the Notepad text editor Why Because it comes free with the Windows operating system (It s also easy to use) But if you have another text-editing program installed on your machine that you d rather use to create your scripts, by all means, use that program The companion CD contains trial versions of a handful of cool text editors that are optimized for JavaScript, including HELIOS Software Solutions TextPad, Bare Bones Software s BBEdit, Macromedia Dreamweaver, and Adobe GoLive Just make sure that you use a text editor to create your scripts and HTML files rather than using a word processor The difference is this: When you save a file by using a word processor application, such as Microsoft Word, the application adds special nontext characters to the saved file Unfortunately, HTML and JavaScript interpreters the bits of software inside Web browsers that process HTML and JavaScript code, respectively can interpret only text; they can t interpret word-processing files containing special characters One exception exists to the rule about not using word processors to create HTML or JavaScript files Some word processors allow you to save files in HTML or plain text format To save a file in plain text format by using Microsoft Windows, for example, you simply choose File Save As and select Text Only from the Save As Type drop-down list If your word processor offers the ability to save files in HTML or plain text format, you can use that word processor to create HTML and script files Otherwise, you need to use a text editor, such as Notepad

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Here are the steps you need to follow to create a file by using Notepad: 1 Choose Start All Programs Accessories Notepad to pull up the Notepad editing window 2 When the Notepad editing window appears, type in your HTML and JavaScript code (See Figure 2-1) 3 When you re finished typing, save the file by choosing File Save If you re creating an HTML file containing embedded JavaScript statements such as the one that I describe in this chapter make sure that the name you give your file contains the htm or html extension

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Figure 2-1: The dateand-timestamp script as it appears in the Notepad editing window

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The script that I demonstrate in this chapter is embedded in an HTML file, which is the most common way to implement JavaScript scripts However, you can also implement a script as a separate file by using the js extension, and then reference that JavaScript file explicitly from an HTML file I cover this technique in 1 Listing 2-1 shows you what the HTML code for the date-and-time-stamp application looks like in the Notepad editing window To see how the code in Listing 2-1 behaves in a Web browser, load the file list0201htm which you find on the companion CD into Netscape Navigator or Internet Explorer

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2: Writing Your Very First Script

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Listing 2-1: The HTML Code for the Date-and-Time-Stamp Application

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<HTML> <HEAD> <TITLE>Displaying the current date and time (basic example)</TITLE> </HEAD> <BODY> <P>This is the HTML text for my first JavaScript application</P> </BODY> </HTML>

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The code in Listing 2-1 displays the following: A title: The title text, Displaying the current date and time (basic example), appears in the title bar of the document window A bit of text: The This is the HTML text for my first JavaScript application text appears in the body of the Web page Figure 2-2 shows how the HTML code in Listing 2-1 appears in Netscape 71

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2: Writing Your Very First Script in Java Maker QR Code 2d barcode in Java 2: Writing Your Very First Script

2: Writing Your Very First Script in Java

Maker QR Code 2d barcode in Java 2: Writing Your Very First Script