The Document Object Model

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Presentation transcript:

The Document Object Model How a browser internally represents an HTML document SE-2840 Dr. Mark L. Hornick

Recall: window is the top-level object in the BOM hierarchy Note: The Document Object Model (DOM) is a child/subset of the BOM SE-2840 Dr. Mark L. Hornick

The Document Object Model (DOM) represents the objects that comprise a web page document What SE2811 pattern Does this remind you of? The hierarchical structure of the DOM below the <body> element depends on the current web page content SE-2840 Dr. Mark L. Hornick

All nodes have relationships to each other document Every node has a parent except for the document node Most elements have descendant nodes html head body title p My title Element node Here is an em word id=“par1” Text node emphasized id=“em1” Attribute node SE-2840 Dr. Mark L. Hornick

Looking closer at an Element object within the <body>: Text and Attribute descendents <p id=“par1”> Here is an<em id=“em1”>emphasized</em> word</p> Here is an emphasized word p Element Here is an em word Text id=“par1” Attribute emphasized id=“em1” SE-2840 Dr. Mark L. Hornick

Each Element, Attribute, or Text fragment in an HTML document is represented by a corresponding object in the DOM hierarchy The DOM objects are programmatically accessible via Javascript These objects are called nodes Nodes can be dynamically accessed, added, deleted, or modified Element node Text node p Attribute node Here is an em word id=“par1” Note: There is also a Comment node. emphasized id=“em1” SE-2840 Dr. Mark L. Hornick