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    Node

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    A Node is an interface from which a number of DOM types inherit, and allows these various types to be treated (or tested) similarly.

    The following interfaces all inherit from Node its methods and properties: Document, Element, CharacterData (which Text, Comment, and CDATASection inherit), ProcessingInstruction, DocumentFragment, DocumentType, Notation, Entity, EntityReference

    These interfaces may return null in particular cases where the methods and properties are not relevant. They may throw an exception - for example when adding children to a node type for which no children can exist.

    Properties

    Inherits properties from its parents EventTarget.[1]

    Node.baseURI Read only
    Returns a DOMString representing the base URL. The concept of base URL changes from one language to another; in HTML, it corresponds to the protocol, the domain name and the directory structure, that is all until the last '/'.
    Node.baseURIObject
    (Not available to web content.) The read-only nsIURI object representing the base URI for the element.
    Node.childNodes Read only
    Returns a live NodeList containing all the children of this node. NodeList being live means that if the children of the Node change, the NodeList object is automatically updated.
    Node.firstChild Read only
    Returns a Node representing the first direct child node of the node, or null if the node has no child.
    Node.lastChild Read only
    Returns a Node representing the last direct child node of the node, or null if the node has no child.
    Node.localName Read only
    Returns a DOMString representing the local part of the qualified name of an element. In Firefox 3.5 and earlier, the property upper-cases the local name for HTML elements (but not XHTML elements). In later versions, this does not happen, so the property is in lower case for both HTML and XHTML.
    Though recent specifications require localName to be defined on the Element interface, Gecko-based browsers still implement it on the Node interface.
    Node.namespaceURI Read only
    The namespace URI of this node, or null if it is no namespace. In Firefox 3.5 and earlier, HTML elements are in no namespace. In later versions, HTML elements are in the http://www.w3.org/1999/xhtml namespace in both HTML and XML trees.
    Though recent specifications require namespaceURI to be defined on the Element interface, Gecko-based browsers still implement it on the Node interface.
    Node.nextSibling Read only
    Returns a Node representing the next node in the tree, or null if there isn't such node.
    Node.nodeName Read only
    Returns a DOMString containing the name of the Node. The structure of the name will differ with the name type. E.g. An HTMLElement will contain the name of the corresponding tag, like 'audio' for an HTMLAudioElement, a Text node will have the '#text' string, or a Document node will have the '#document' string.
    Node.nodePrincipal
    A nsIPrincipal representing the node principal.
    Node.nodeTypeRead only
    Returns an unsigned short representing the type of the node. Possible values are:
    Name Value
    ELEMENT_NODE 1
    ATTRIBUTE_NODE 2
    TEXT_NODE 3
    CDATA_SECTION_NODE 4
    ENTITY_REFERENCE_NODE 5
    ENTITY_NODE 6
    PROCESSING_INSTRUCTION_NODE 7
    COMMENT_NODE 8
    DOCUMENT_NODE 9
    DOCUMENT_TYPE_NODE 10
    DOCUMENT_FRAGMENT_NODE 11
    NOTATION_NODE 12
    Node.nodeValue
    Is a DOMString representing the value of an object. For most Node type, this returns null and any set operation is ignored. For nodes of type TEXT_NODE (Text objects), COMMENT_NODE (Comment objects), and PROCESSING_INSTRUCTION_NODE (ProcessingInstruction objects), the value corresponds to the text data contained in the object.
    Node.ownerDocument Read only
    Returns the Document that this node belongs to. If no document is associated with it, returns null.
    Node.parentNode Read only
    Returns a Node that is the parent of this node. If there is no such node, like if this node is the top of the tree or if doesn't participate in a tree, this property returns null.
    Node.parentElement Read only
    Returns an Element that is the parent of this node. If the node has no parent, or if that parent is not an Element, this property returns null.
    Node.prefix Read only
    Is a DOMString representing the namespace prefix of the node, or null if no prefix is specified.
    Though recent specifications require prefix to be defined on the Element interface, Gecko-based browsers still implement it on the Node interface.
    Node.previousSibling Read only
    Returns a Node representing the previous node in the tree, or null if there isn't such node.
    Node.textContent
    Is a DOMString representing the textual content of an element and all its descendants.

    Methods

    Inherits methods from its parents EventTarget.[1]

    Node.appendChild()
    Insert a Node as the last child node of this element.
    Node.cloneNode()
    Clone a Node, and optionally, all of its contents. By default, it clones the content of the node.
    Node.compareDocumentPosition()
     
    Node.contains()
     
    Node.getFeature()
    ...
    Node.getUserData()
    Allows a user to get some DOMUserData from the node.
    Node.hasAttributes()
    Returns a Boolean indicating if the element has any attributes, or not.
    Node.hasChildNodes()
    Returns a Boolean indicating if the element has any child nodes, or not.
    Node.insertBefore()
    Inserts the first Node given in a parameter immediately before the second, child of this element, Node.
    Node.isDefaultNamespace()
     
    Node.isEqualNode()
     
    Node.isSameNode()
     
    Node.isSupported()
    Returns a Boolean flag containing the result of a test whether the DOM implementation implements a specific feature and this feature is supported by the specific node.
    Node.lookupPrefix()
     
    Node.lookupNamespaceURI()
     
    Node.normalize()
    Clean up all the text nodes under this element (merge adjacent, remove empty).
    Node.removeChild()
    Removes a child node from the current element, which must be a child of the current node.
    Node.replaceChild()
    Replaces one child Node of the current one with the second one given in parameter.
    Node.setUserData()
    Allows a user to attach, or remove, DOMUserData to the node.
     

    Examples

    Browse all child nodes

    The following function recursively cycles all child nodes of a node and executes a callback function upon them (and upon the parent node itself).

    function DOMComb (oParent, oCallback) {
      if (oParent.hasChildNodes()) {
        for (var oNode = oParent.firstChild; oNode; oNode = oNode.nextSibling) {
          DOMComb(oNode, oCallback);
        }
      }
      oCallback.call(oParent);
    }

    Syntax

    DOMComb(parentNode, callbackFunction);

    Description

    Recursively cycle all child nodes of parentNode and parentNode itself and execute the callbackFunction upon them as this objects.

    Parameters

    parentNode
    The parent node (Node Object).
    callbackFunction
    The callback function (Function).

    Sample usage

    The following example send to the console.log the text content of the body:

    function printContent () {
      if (this.nodeValue) { console.log(this.nodeValue); }
    }
    
    onload = function () {
      DOMComb(document.body, printContent);
    };

    Remove all children nested within a node

    Element.prototype.removeAll = function () {
      while (this.firstChild) { this.removeChild(this.firstChild); }
      return this;
    };

    Sample usage

    /* ... an alternative to document.body.innerHTML = "" ... */
    document.body.removeAll();

    Specifications

    Specification Status Comment
    DOM
    The definition of 'Node' in that specification.
    Living Standard Removed the following properties: attributes, namespaceURI, prefix, and localName.
    Removed the following methods: isSupported(), hasAttributes(), isSameNode(), getFeature(), setUserData(), and getUserData().
    Document Object Model (DOM) Level 3 Core Specification
    The definition of 'Node' in that specification.
    Recommendation The methods insertBefore(), replaceChild(), removeChild(), and appendChild() returns one more kind of error (NOT_SUPPORTED_ERR) if called on a Document.
    The normalize() method has been modified so that Text node can also be normalized if the proper DOMConfiguration flag is set.
    Added the following methods: compareDocumentPosition(), isSameNode(), lookupPrefix(), isDefaultNamespace(), lookupNamespaceURI(), isEqualNode(), getFeature(), setUserData(), and getUserData().
    Added the following properties: baseURI and textContent.
    Document Object Model (DOM) Level 2 Core Specification
    The definition of 'Node' in that specification.
    Recommendation The ownerDocument property was slightly modified so that DocumentFragment also returns null.
    Added the following properties: namespaceURI, prefix, and localName.
    Added the following methods: normalize(), isSupported() and hasAttributes().
    Document Object Model (DOM) Level 1 Specification
    The definition of 'Node' in that specification.
    Recommendation Initial definition.

     

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) 1.0 (1.7 or earlier) (Yes) (Yes) (Yes)
    getFeature() Not supported Supported from 1.0 (1.7 or earlier) to 6.0 (6.0).
    Removed in 7.0 (7.0)
    ? Not supported Not supported
    getUserData(), setUserData() and hasAttributes() Not supported Supported from 1.0 (1.7 or earlier) to 21.0 (21.0).
    Removed in 22.0 (22.0)
    ? Not supported Not supported
    isSameNode() Not supported Supported from 1.0 (1.7 or earlier) to 9.0 (9.0).
    Removed in 10.0 (10.0)
    ? Not supported Not supported
    isSupported() ? Supported from 1.0 (1.7 or earlier) to 21.0 (21.0).
    Removed in 22.0 (22.0)
    ? ? ?
    attributes Not supported Supported from 1.0 (1.7 or earlier) to 21.0 (21.0).
    Moved to Element in 22.0 (22.0)
    Not supported Not supported Not supported
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) 1.0 (1.0) (Yes) (Yes) (Yes)
    getFeature() Not supported Supported from 1.0 (1.7 or earlier) to 6.0 (6.0).
    Removed in 7.0 (7.0)
    ? Not supported Not supported

    [1] Webkit and Blink incorrectly do not make Node inherit from EventTarget.

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    Contributors to this page: fscholz
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