Dynamic HTML (DHTML) is built on an object model that extends the traditional static HTML document. It enables Web authors to create highly interactive Web pages. DHTML provides a set of technologies for creating dynamic content for Web sites. Using DHTML, the content is dynamically rendered and altered on the client without having to make a round trip to the server.
DHTML has the following component technologies:
- Document Object Model
- Dynamic Styles
- Dynamic Positioning
- Dynamic Content
- Data Binding
It is important to know about the Document Object Model (DOM). DOM is a road map through which any element in an HTML/XML document can be located. According to the World Wide Web Consortium, the DOM is a platform- and language-neutral interface that allows programs and scripts to dynamically access and update the contents, structure, and style of a document. The document can be further processed, and the results of the processing can be incorporated back into the present page. DOM comprises the components listed below:
- Objects
- Properties
- Events
- Methods
- Collections
Here are some important facts about DHTML:
- DHTML uses the DOM interface to manipulate HTML and XML documents and to provide them the logical structure.
- DHTML is a combination of scripts, style, and HTML objects that provide Web site interactivity.
- DHTML can be used as an alternative to server-side technologies such as ASP.
- A major difference between DHTML and HTML is Web site interactivity. DHTML enhances HTML for Web site interactivity.
- DHTML is often used to make rollover buttons or drop-down menus on a Web page.
- DHTML is less commonly used for creating browser-based action games.
There are some disadvantages too of using DHTML. It is difficult to develop and debug Web pages due to varying degrees of support among Web browsers of the technologies involved. Due to the variety of screen sizes available, it becomes a difficult task for developers to fine-tune the page for all browsers and screen-size combinations.
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