DOM Quick Overview
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DOM Quick Overview
- 1. Signure Technology Pvt Ltd. www.signure.com Seminar for DOM – Document Object Model
- 4. HTML DOM Introduction What is the DOM? "The W3C 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 DOM defines the objects and properties of all document elements, and the methods (interface) to access them.
- 9. HTML DOM Node Tree (Document Tree) All the nodes in a node tree have relationships to each other. The tree structure is called a node-tree. Node:- Parents, Children, and Siblings
- 21. getElementsByTagName() <html> <body> <p id="intro">W3Schools example</p> <div id="main"> <p id="main1">The DOM is very useful</p> <p id="main2">This example demonstrates how to use the <b>getElementsByTagName</b> method</p> </div> <script type="text/javascript"> x=document.getElementById("main").getElementsByTagName("p"); document.write("First paragraph inside the main div: " + x[0].childNodes[0].nodeValue); </script> </body> </html>
- 26. Node Property Everything in a document can be considered a node, including the document itself. Properties Of Node Interface: • nodeName : Returns name of element. • nodeValue: Returns value of element. • nodeType :Returns type of node whether element or document etc. • parentNode: Contains the parent node (for nodes that can have parents). • childNodes: Contains a node list containing the children (for nodes that can have children). • firstChild : Contains the first child of this node.
- 29. Node Property appendChild(newchild): Appends newChild as the last child of this node createTextNode = This property used to create new text node. e.g. createTextNode(a); createElement = This property usedt to create element e.g. createElement('tr');
- 30. Node List The nodeList object represents a node and its child nodes as a node tree. Property of Nodelist: length: Returns an unsigned long integer indicating the number of nodes in the NodeList . Method of Nodelist: item(index): This method takes an index as its argument and returns the node at that index position.
- 31. Properties of Document: doctype: Returns <!DOCTYPE information of document. implementation: Returns implementation node. documentElement: Returns root element of the document.