Page 117 - DCAP202_Fundamentals of Web Programming

Fundamentals of Web Programming Anil Sharma, Lovely Professional University

Notes Unit 9: DOM Model

CONTENTS
Objectives
Introduction

9.1 DOM Model – An Overview
9.1.1 Objects of Desire
9.1.2 Dial M for Model

9.1.3 Nodes
9.2 Objects in HTML
9.2.1 Document Object
9.2.2 Event Object
9.2.3 Element Object

9.3 Summary
9.4 Keywords
9.5 Review Questions

9.6 Further Readings
Objectives

After studying this unit, you will be able to:
 Understand DOM Model
 Discuss Objects in HTML

Introduction

The Document Object Model (DOM) is a programming API for HTML and XML documents. It
defines the logical structure of documents and the way a document is accessed and manipulated.
In the DOM specification, the term “document” is used in the broad sense – increasingly, XML is
being used as a way of representing many different kinds of information that may be stored in
diverse systems, and much of this would traditionally be seen as data rather than as documents.
Nevertheless, XML presents this data as documents, and the DOM may be used to manage this
data.
With the Document Object Model, programmers can create and build documents, navigate their
structure, and add, modify, or delete elements and content. Anything found in an HTML or XML
document can be accessed, changed, deleted, or added using the Document Object Model, with a
few exceptions – in particular, the DOM interfaces for the internal subset and external subset
have not yet been specified.

9.1 DOM Model – An Overview

The Document Object Model is a programming API for documents. The object model itself
closely resembles the structure of the documents it models. For instance, consider this table,

110 LOVELY PROFESSIONAL UNIVERSITY