JavaScript
HTML DOM Document
The HTML DOM
document object is the owner of all other objects in your web page.
The HTML DOM
Document Object
The document
object represents your web page.
If you want
to access any element in an HTML page, you always start with accessing the
document object.
Below are
some examples of how you can use the document object to access and manipulate
HTML.
Finding HTML
Elements
Method Description
document.getElementById(id) Find an element by element id
document.getElementsByTagName(name) Find elements by tag name
document.getElementsByClassName(name) Find elements by class name
Changing
HTML Elements
Method Description
element.innerHTML
= new html content Change the inner HTML of an element
element.attribute
= new value Change the attribute value
of an HTML element
element.setAttribute(attribute,
value) Change the attribute value of an
HTML element
element.style.property
= new style Change the style of an HTML
element
Adding and
Deleting Elements
Method Description
document.createElement(element) Create an HTML element
document.removeChild(element) Remove an HTML element
document.appendChild(element) Add an HTML element
document.replaceChild(element) Replace an HTML element
document.write(text) Write into the HTML output stream
Adding
Events Handlers
Method Description
document.getElementById(id).onclick
= function(){code} Adding event
handler code to an onclick event
Finding HTML
Objects
The first
HTML DOM Level 1 (1998), defined 11 HTML objects, object collections, and
properties. These are still valid in HTML5.
Later, in
HTML DOM Level 3, more objects, collections, and properties were added.
Property Description DOM
document.anchors Returns all <a> elements that have a name
attribute 1
document.applets Returns all <applet> elements
(Deprecated in HTML5) 1
document.baseURI Returns the absolute base URI of the document 3
document.body Returns the <body> element 1
document.cookie Returns the document's cookie 1
document.doctype Returns the document's doctype 3
document.documentElement Returns the <html> element 3
document.documentMode Returns the mode used by the browser 3
document.documentURI Returns the URI of the document 3
document.domain Returns the domain name of the document server 1
document.domConfig Obsolete. Returns the DOM configuration 3
document.embeds Returns all <embed> elements 3
document.forms Returns all <form> elements 1
document.head Returns the <head> element 3
document.images Returns all <img> elements 1
document.implementation Returns the DOM implementation 3
document.inputEncoding Returns the document's encoding (character set) 3
document.lastModified Returns the date and time the document was
updated 3
document.links Returns all <area> and <a> elements
that have a href attribute 1
document.readyState Returns the (loading) status of the document 3
document.referrer Returns the URI of the referrer (the linking
document) 1
document.scripts Returns all <script> elements 3
document.strictErrorChecking Returns if error checking is enforced 3
document.title Returns the <title> element 1
document.URL Returns the complete URL of the document 1
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