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Lecture 13: The Document Tree

Lecture 13: The Document Tree. Create Element, Remove Child. The Document Tree. Document. Root Element <html>. Element <head>. Element <body>. Element <title>. Element <a>. Element <h1>. Text: HelloWorld. Attribute “ href ”. Dynamic HTML.

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Lecture 13: The Document Tree

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  1. Lecture 13: The Document Tree Create Element, Remove Child

  2. The Document Tree Document Root Element <html> Element <head> Element <body> Element <title> Element <a> Element <h1> Text: HelloWorld Attribute “href”

  3. Dynamic HTML • JavaScript can change all HTML elements dynamically • Can change all the HTML attributes • Can change all the CSS styles • Can remover exiting HTML elements and attributes • Can add new HTML elements and attributes • Can react to all existing HTML events • Can Create new HTML events

  4. Node Object Node Document Node Element Node <body>,<div>, <p> Text Node data

  5. Node Object • Some nodes of the tree are JavaScript objects corresponding to HTML elements. • <body>, <a>, <p> elements • Element node • Other nodes may contain text representing the content of an element. • Text node • There is a node representing the document. • Document node

  6. Properties of Node • nodeType: Number representing the type of node(Element) • nodeName: string providing a name of this Node Type. • parentNode: reference to object that is this node’s parent. • childNodes: reference to nodes that are this node’s child. • previousSibling: previous sibling of this node. • nextSibling: next sibling of this node. • attributes: an array containing Attr instances representing this node’s attributes.

  7. Node type

  8. Document Node • Document Node is the parent of the html Element node. • Properties of the document object • title, body, url, etc • Methods of the document object • createElement(string): given an element type name (such as div), returns an Element instance corresponding to that element type. • createTextNode(string): return a Text instance containing the given string as its data value. • getElementById(string). • getElementsByTagName(string).

  9. ElementNode • Element node represents HTML elements. • <a>, <p>, <body>, etc • Important methods of Element nodes. • getAttribute(String) • setAttribute(String, String) • removeAttribute(String) • hasAttribute(String)

  10. Text Node • Instances of the text DOM object are used to represent character data. • The primary property of Text node is data, which is the text represented by the Text node. • One Element node may have several Text nodes that are siblings of a single Text node.

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