Applied Online Programming

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Presentation transcript:

Applied Online Programming ECA 225 Applied Online Programming W3C DOM ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming DOM Redux DOM hierarchical model of all objects on an HTML page Oct 2000 first standard DOM, DOM1 NN6, IE5 earlier browsers used proprietary DOMs NN4 (layers) IE4 (all) ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming DOM Redux cont … newer browsers Netscape is not backwards compatible with earlier versions of DOM Internet Explorer is backwards compatible with earlier versions of DOM ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming W3C DOM maps all objects found on web page window top of hierarchy document one level down all other objects contained in document relies on object’s id earlier DOMs relied on object’s name ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming W3C DOM cont … document.getElementById( ‘id ’) access attributes of objects document.getElementsByTagName(‘html_tag’) creates an array of all elements on page with a given tag name t = document.getElementById( ‘div1’ ).style.top; li_array = document.getElementsByTagName( ‘li’ ); ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming nodes when a document is loaded into a browser, objects are created in memory W3C DOM provides a model for how all the objects are related W3C DOM refers to objects as nodes ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node example <p>This is the text node within an element node.</p> this example has 2 nodes: <p> tag is an element node the words between the opening and closing <p> tags is a text node parent-child relationship element node <p> text node This is the text node … ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node example <p>This is a child node of p. <b>And this is a child node of b.</b></p> <p> is the parent of 2 nodes a text node, “This is a child node of p.” another element node, <b> <b> contains a child node, “And this is a child node of b.” element node <p> text node This is a child node of p. element node <b> text node And this is a child node of b. ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming attribute node <div align='left'> <p>This is a child node of p, which is a child node of div. <b>And this is a child node of b, which is a child node of p.</b></p> </div> element node <div> attribute node align element node <p> text node This is a child node of p ... element node <b> text node And this is a child node of b ... ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node properties each node has properties that represent its place in the hierarchy parentNode creates a reference to the parent node of the object document.getElementById(‘id’).parentNode; ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node properties firstChild creates a reference to the first child of the object document.getElementById(‘id’).firstChild; ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node properties lastChild creates a reference to the last child of the object document.getElementById(‘id’).lastChild; ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node properties childNodes creates an array of all the children of the object document.getElementById(‘id’).childNodes; ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node properties nodeValue if the node is a text node, the value is returned document.getElementById(‘id’).firstChild.nodeValue; ECA 225 Applied Interactive Programming

ECA 225 Applied Interactive Programming node properties nodeName returns the name of the node the element name if it is an element node “#text” if it is a test node document.getElementById(‘id’).firstChild.nodeName; ECA 225 Applied Interactive Programming