javascript - document object

Development/JavaScript

javascript - document object

linuxism 2015. 7. 11. 14:18

HTML DOM Nodes

In the HTML DOM (Document Object Model), everything is a node:

The document itself is a document node
All HTML elements are element nodes
All HTML attributes are attribute nodes
Text inside HTML elements are text nodes
Comments are comment nodes

The Document Object

When an HTML document is loaded into a web browser, it becomes a document object.

The document object is the root node of the HTML document and the "owner" of all other nodes:
(element nodes, text nodes, attribute nodes, and comment nodes).

The document object provides properties and methods to access all node objects, from within JavaScript.

Tip: The document is a part of the Window object and can be accessed as window.document.

Browser Support

The Document Object is supported in all major browsers.

Document Object Properties and Methods

The following properties and methods can be used on HTML documents:

Property / Method	Description
document.activeElement	Returns the currently focused element in the document
document.addEventListener()	Attaches an event handler to the document
document.adoptNode()	Adopts a node from another document
document.anchors	Returns a collection of all <a> elements in the document that have a name attribute
document.applets	Returns a collection of all <applet> elements in the document
document.baseURI	Returns the absolute base URI of a document
document.body	Sets or returns the document's body (the <body> element)
document.close()	Closes the output stream previously opened with document.open()
document.cookie	Returns all name/value pairs of cookies in the document
document.createAttribute()	Creates an attribute node
document.createComment()	Creates a Comment node with the specified text
document.createDocumentFragment()	Creates an empty DocumentFragment node
document.createElement()	Creates an Element node
document.createTextNode()	Creates a Text node
document.doctype	Returns the Document Type Declaration associated with the document
document.documentElement	Returns the Document Element of the document (the <html> element)
document.documentMode	Returns the mode used by the browser to render the document
document.documentURI	Sets or returns the location of the document
document.domain	Returns the domain name of the server that loaded the document
document.domConfig	Obsolete. Returns the DOM configuration of the document
document.embeds	Returns a collection of all <embed> elements the document
document.forms	Returns a collection of all <form> elements in the document
document.getElementById()	Returns the element that has the ID attribute with the specified value
document.getElementsByClassName()	Returns a NodeList containing all elements with the specified class name
document.getElementsByName()	Returns a NodeList containing all elements with a specified name
document.getElementsByTagName()	Returns a NodeList containing all elements with the specified tag name
document.hasFocus()	Returns a Boolean value indicating whether the document has focus
document.head	Returns the <head> element of the document
document.images	Returns a collection of all <img> elements in the document
document.implementation	Returns the DOMImplementation object that handles this document
document.importNode()	Imports a node from another document
document.inputEncoding	Returns the encoding, character set, used for the document
document.lastModified	Returns the date and time the document was last modified
document.links	Returns a collection of all <a> and <area> elements in the document that have a href attribute
document.normalize()	Removes empty Text nodes, and joins adjacent nodes
document.normalizeDocument()	Removes empty Text nodes, and joins adjacent nodes
document.open()	Opens an HTML output stream to collect output from document.write()
document.querySelector()	Returns the first element that matches a specified CSS selector(s) in the document
document.querySelectorAll()	Returns a static NodeList containing all elements that matches a specified CSS selector(s) in the document
document.readyState	Returns the (loading) status of the document
document.referrer	Returns the URL of the document that loaded the current document
document.removeEventListener()	Removes an event handler from the document (that has been attached with the addEventListener()method)
document.renameNode()	Renames the specified node
document.scripts	Returns a collection of <script> elements in the document
document.strictErrorChecking	Sets or returns whether error-checking is enforced or not
document.title	Sets or returns the title of the document
document.URL	Returns the full URL of the HTML document
document.write()	Writes HTML expressions or JavaScript code to a document
document.writeln()	Same as write(), but adds a newline character after each statement

Warning !!!

In the W3C DOM Core, the Document object inherits all properties and methods from the Node object.

Many of these properties and methods make no sense used on documents.

Avoid using these node object properties and methods on HTML document objects:

Property / Method	Reason for avoiding
document.attributes	Documents don't have attributes
document.hasAttributes()	Documents don't have attributes
document.nextSibling	Documents don't have siblings
document.nodeName	This is always #document
document.nodeType	This is always 9 (DOCUMENT_NODE)
document.nodeValue	Documents don't have an node value
document.ownerDocument	Documents don't have an owner document
document.ownerElement	Documents don't have an owner element
document.parentNode	Documents don't have a parent node
document.previousSibling	Documents don't have siblings
document.textContent	Documents don't have a text content

source - http://www.w3schools.com/jsref/dom_obj_document.asp

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