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Programs run in the browser can also perform useful interactive effects Rather than a web page being a fixed combination of text and graphics, every element of the page can be generated or modified by the program This way of creating the content of a web page from its programming is called Dynamic HTML (DHTML) Common DHTML applications include cascading menus (multilevel menus that appear dynamically) and checking the user input values in forms before sending them off to the server Adding program code to the web page is generally easier than writing CGI programs On the other hand, if your web server already has standard programs or server extensions installed, running server programs from commands in your web page can be quite easy
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The easiest kind of program code to create and debug is JavaScript in the web page The script code runs in your browser, so you can create the pages on your own PC and test and debug them in the browser on the PC before you upload them to your web server
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JavaScript is a scripting language developed by Netscape and used in its web browser ECMAScript, named after the European standards body, ECMA, is a standardized version of JavaScript Microsoft s version of ECMAScript is JScript JavaScript is the name still in common use for all these variants, and with moderate care it is possible to write your JavaScript, ECMAScript, or JScript script so that it runs in Netscape, Internet Explorer, and other browsers This chapter refers to all three scripting languages as JavaScript With JavaScript you can do a variety of actions on a web page, such as I Read what kind of browser and display the user has and adjust the page accordingly I Open additional browser windows and write content, title, and status bar text to them I Control frames and the documents within them I Provide mouseover feedback with images and sounds (that is, events that happen when the user moves the mouse over an object) I Create forms, set form defaults, read and check form input, and change the page in response I Create and read cookies and respond according to the cookie data I Read and write the date and time I Execute Java applets with varying parameters depending on user input or on which browser is displaying the page I Animate objects by sliding document layers over each other
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The JavaScript language offers features common to other programming languages Features include variables, loops, conditional statements, numeric and string operators, user-defined functions (similar to subroutines), and comments
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Microsoft has its own technologies for making web pages more interactive In addition to its JScript version JavaScript, Microsoft has a fully proprietary scripting language for Internet Explorer called VBScript, an extension of Microsoft s Visual Basic language You can use VBScript in web pages for many of the same functions you might perform in JavaScript, but the language is very different and works only in Internet Explorer We suggest using JScript or JavaScript rather than VBScript so your scripts run in Netscape, Opera, and other browsers, as well as in IE
How JavaScript Works
Browsers use the object and event model to describe the structure of a displayed web page and to handle user input Each item a browser displays (or holds hidden within the HTML code of a page) is an object When scripts run, they can create, change, and read objects Scripts can create objects of their own as well In a browser scripting language like JavaScript, each object has a name, either inherently or assigned by the programmer The entire web page is named document, for instance The main browser window is named (unremarkably) window You might create additional objects of the window type (new browser windows) with names assigned by you Objects have properties For example, one property of a window object is the text that appears in its title bar That property would be referred to as windowtitle Properties can have subproperties of their own Scripts can apply actions, called methods, to the objects in a web page A script executes a method like this:
documentwrite("<I>Hi, Mom!</I>")
This line of JavaScript makes the browser add Hi, Mom! to the current document You can assign pieces of script code to particular objects to be run when something happens to the object for example, when someone moves the mouse over an image or clicks on a button Such a happening is called an event Moving the mouse cursor over an object, for instance, is a mouseover event By associating code with an object and an event, the code can change the properties of the object when the event happens Code can change the filename of an image object when a mouseover happens, for instance, so the image content can change when the cursor passes over the image
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