1: All You Ever Wanted to Know about JavaScript in Java

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<HTML> <HEAD> <SCRIPT LANGUAGE= JavaScript > // JavaScript statements go here function processOrder() { // More JavaScript statements go here } </SCRIPT> </HEAD> <BODY> <FORM NAME= myForm > <INPUT TYPE= button NAME= processOrder VALUE= Click to process your order onClick= processOrder(); > </HTML>

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You can use the <SCRIPT> and </SCRIPT> tags to include a separate, external JavaScript file (a file containing only JavaScript statements and bearing a js extension) into an HTML file In the example below, the JavaScript processOrder() function is defined in the myJSfilejs file The function is triggered, or called, when the user clicks the Click Here to Process Your Order link

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<HTML> <HEAD> <SCRIPT LANGUAGE= JavaScript SRC= myJSfilejs > </SCRIPT> </HEAD> <BODY> <A HREF= javascript:processOrder(); >Click here to process your order</A> </BODY> </HTML>

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Keep in mind that most of the examples in these printed pages focus on the JavaScript portion of the code (naturally!) But I include the HTML that you need to create the examples on the CD-ROM, so you don t have sweat re-creating the Web pages from scratch! Because Web pages aren t made of HTML alone, however, JavaScript provides access to more than just HTML objects JavaScript also provides access to browser- and platform-specific objects Browser plug-ins (such as RealPlayer and Adobe Acrobat), the name and version of a particular viewer s browser, and the current date are all examples of non-HTML objects that you can work with by using JavaScript Together, all the objects that make up a Web site HTML objects, browserand platform-related objects, and special objects built right into the JavaScript language are known as the document object model (DOM)

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JavaScript and Your Web Browser

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You need to use Netscape Navigator 71 (or higher) or Microsoft Internet Explorer 60 (or higher) to use the latest JavaScript enhancements that I demonstrate in this book Not all browsers are created equal: Internet Explorer s support for JavaScript differs significantly from Navigator s, and support for JavaScript varies from browser version to browser version For details, check out 5 Although you can create and view JavaScript scripts with an old version of one of these browsers, I recommend that you install the most current version of Navigator or Internet Explorer (What the heck they re both free!) The latest versions of each product boast the very latest JavaScript features and bug fixes; they re also the versions that you see in the figures and examples in this book You can use another browser, such as Opera or America Online (or even another Internet protocol, such as FTP) to download the latest version of Navigator or Internet Explorer and try it out The section What Do I Need to Get Started later in this chapter is devoted to the ins and outs of obtaining and installing a JavaScript-enabled browser For now, suffice it to say that You need Navigator or Internet Explorer to work with JavaScript, which means that you have to be running one of the client platforms that supports these browsers (The Macintosh operating system and Windows both support Navigator and Internet Explorer) You need to be aware that people might use other, non-JavaScript-enabled browsers to view your Web pages or they might use JavaScript-enabled browsers with JavaScript support turned off Either way, you have no way to guarantee that everyone who visits your page can view your JavaScript handiwork (Check out 5 for more information on this topic)

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JavaScript and browser security

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In an era when computer viruses proliferate faster than crab grass, browser security is an important issue You might be relieved to know that JavaScript poses no special security threats Because JavaScript can t access any objects other than browser-contained objects (with the exception of cookies, which I discuss in 6), no one can use JavaScript to open up secret dial-up connections, wipe users hard drives, or perform other malicious acts, even by accident In other words, JavaScript is subject to the security controls built into JavaScript-supporting browsers

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1: All You Ever Wanted to Know about JavaScript in Java Generator QR Code in Java 1: All You Ever Wanted to Know about JavaScript

1: All You Ever Wanted to Know about JavaScript in Java

Generator QR Code in Java 1: All You Ever Wanted to Know about JavaScript