Node

Node는 여러 가지 DOM 타입들이 상속하는 인터페이스이며 그 다양한 타입들을 비슷하게 처리할 수 있게 한다. 예를들어, 똑같은 메소드를 상속하거나 똑같은 방식으로 테스트를 할수있다

다음의 인터페이스들은 모두 Node로부터 메소드와 프라퍼티를 상속한다: Document, Element, CharacterData (Text, Comment, CDATASection이 상속), ProcessingInstruction, DocumentFragment, DocumentType, Notation, Entity, EntityReference

이 인터페이스들은 메소드나 프라퍼티가 적합하지 않은 경우에 null을 반환할 수 있다. 그들은 예외를 발생할 수 있다 - 예를 들어 자식이 있을 수 없는 노드 타입에 자식을 추가할 때 말이다.

부모인 EventTarget으로부터 프라퍼티를 상속한다.^[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.

부모인 EventTarget으로부터 메소드를 상속한다.^[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.

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);
};

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

Sample usage

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