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Overview
Dynamic HTML (DHTML), which was introduced as part of Microsoft Internet Explorer 4.0, is a technology that provides significant benefits to Webmasters and developers. Why the buzz about DHTML? For clients who use Internet Explorer as their browser of choice, DHTML represents a dramatic change in how they experience the Web.It began with the Internet Explorer 4.0 "HTML display engine"—sometimes called Trident in Microsoft literature. As part of the design of Internet Explorer 4.0, Microsoft made Trident a COM component that exposes many of its internal objects that are used for displaying HTML pages in Internet Explorer 4.0. This feature allows you to traverse the portions of an HTML page in script or code as if the HTML page were a data structure. Gone are the days of having to parse HTML or write grotesque Common Gateway Interface (CGI) scripts to get to data in a form. The real power of using DHTML, however, lies not in this ability to access the HTML objects but in the ability to actually change and manipulate the HTML page on the fly—thus the name Dynamic HTML.Once you grasp the concept of DHTML, a million possible applications will come to mind. For Webmasters, DHTML means that much of the logic that manipulates a Web page can live in scripts that are downloaded to the client. C++ developers can embed DHTML in their applications and use it as an embedded Web client or as a super-flexible, dynamic "form" that their application can change on the fly.Unfortunately, DHTML is so powerful and extensive that it requires a separate book to fill you in on all of the copious details. For example, to really leverage DHTML you need to understand all of the possible elements of an HTML page: forms, lists, style sheets, and so on. Inside Dynamic HTML by Scott Isaacs (Microsoft Press, 1997) is a great resource for learning the details of DHTML.
Instead of covering all aspects of DHTML, I'll briefly introduce you to the DHTML object model, show you how to work with the model from the scripting angle (as a reference), and then show you how to work with the model from both the Microsoft Foundation Class (MFC) Library and the Active Template Library (ATL). These features are all made possible by the excellent DHTML support introduced in Microsoft Visual C++ .NET.
