Javascript DOM Intro

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:

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What is DOM

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 W3C 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

With the object model, JavaScript gets all the power it needs to create dynamic HTML:

1. JavaScript can change all the HTML elements in the page

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2. JavaScript can change all the HTML attributes in the page

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3. JavaScript can change all the CSS styles in the page

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4. JavaScript can remove existing HTML elements and attributes

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5. JavaScript can add new HTML elements and attributes

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6. JavaScript can react to all existing HTML events in the page

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7. JavaScript can create new HTML events in the page

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