JavaScript
HTML DOM
With the
HTML DOM, JavaScript can access and change all the elements of an HTML
document.
The HTML DOM
(Document Object Model)
When a web
page is loaded, the browser creates a Document Object Model of the page.
The HTML DOM
model is constructed as a tree of Objects:
The HTML DOM
Tree of Objects
With the
object model, JavaScript gets all the power it needs to create dynamic HTML:
JavaScript
can change all the HTML elements in the page
JavaScript
can change all the HTML attributes in the page
JavaScript
can change all the CSS styles in the page
JavaScript
can remove existing HTML elements and attributes
JavaScript
can add new HTML elements and attributes
JavaScript
can react to all existing HTML events in the page
JavaScript
can create new HTML events in the page
What
You Will Learn
In the next
chapters of this tutorial you will learn:
How to
change the content of HTML elements
How to
change the style (CSS) of HTML elements
How to react
to HTML DOM events
How to add
and delete HTML elements
What
is the DOM?
The DOM is a
WWWC (World Wide Web Consortium) standard.
The DOM
defines a standard for accessing documents:
"The WWWC
Document Object Model (DOM) is a platform and language-neutral interface that
allows programs and scripts to dynamically access and update the content,
structure, and style of a document."
The WWWC DOM standard is separated into 3 different parts:
Core DOM -
standard model for all document types
XML DOM -
standard model for XML documents
HTML DOM -
standard model for HTML documents
What
is the HTML DOM?
The HTML DOM
is a standard object model and programming interface for HTML. It defines:
The HTML
elements as objects
The
properties of all HTML elements
The methods
to access all HTML elements
The events
for all HTML elements
In other
words: The HTML DOM is a standard for how to get, change, add, or delete HTML
elements.
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