Nancy Deborah R
UNIT III SERVER SIDE SCRIPTING
Host Objects: Browsers and the DOM-Introduction to the Document Object Model DOM History and Levels-Intrinsic Event Handling-Modifying Element Style-The Document Tree-DOM Event Handling-Accommodating Noncompliant Browsers Properties of window. Server-Side Programming: Java Servlets- Architecture -Overview-A Servlet-Generating Dynamic Content-Life Cycle- Parameter Data-Sessions-Cookies-URL Rewriting-Other Capabilities-Data Storage Servlets and Concurrency- Databases and Java Servlets.
HOST OBJECTS
3.1 INTRODUCTION TO THE DOCUMENT OBJECT MODEL
The Document Object Model (DOM) is the model that describes how all elements in an HTML page, like input fields, images, paragraphs etc., are related to the topmost structure: the document itself. By calling the element by its proper DOM name, we can influence it. The Document Object Model, or DOM, is the interface that allows you to programmatically access and manipulate the contents of a web page (or document). It provides a structured, object-oriented representation of the individual elements and content in a page with methods for retrieving and setting the properties of those objects. It also provides methods for adding and removing such objects, allowing you to create dynamic content. The DOM also provides an interface for dealing with events, allowing you to capture and respond to user or browser actions. This feature is briefly covered here but the details are saved for another article. For this one, the discussion will be on the DOM representation of a document and the methods it provides to access those objects.
Nodes
The DOM is a Document Object Model, a model of how the various objects of a document are related to each other. In the Level 1 DOM, each object, whatever it may be exactly, is a Node. So if you do This is a paragraph you have created two nodes: an element P and a text node with content 'This is a paragraph'. The text node is inside the element, so it is considered a child node of the element. Conversely, the element is considered the parent node of the text node. ................
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