JavaScript Documet Object Model Tutorial Videos for Beginner

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JavaScript DOM Tutorial Videos for Beginner by
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Highlights

• Document Object Model
• Document Object Properties
• Document Object Methods
• Document Object with Forms
• Creating and Deleting Cookies

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Document Object Model

• Acts as programming interface for HTML and XML
  documents.
• Provides structural representation to the
  documents.
• Provides a way to represent, store and manipulate
  web documents.
• It also called as object-oriented presentation of
  the web pages.
• It was released for the first time in 1/10/1998.
• Lastly updated in 2004.Now the stable version is
  DOM4.

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Document Object Properties

• Initially Dom1 released with some object
  properties later in developing DOM3 new
  properties were added. properties are values of
  HTML elements which can set or change.
• DOM1 properties are as follows
• document.anchors returns all ltagt elements that
  have a name attribute.
• document.applets returns all ltappletgt elements.
• document.body returns the ltbodygt element.
• document.cookie returns the document's cookie.
• document.domain returns the domain name of the
  document server.
• document.forms returns all ltformgt elements

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Document Object Properties

• document.images returns all ltimggt elements
• document.links returns all ltareagt and ltagt
  elements that have a href attribute.
• document.referrer returns the URI of the
  referrer.
• document.title returns the lttitlegt element.
• document.URL returns the complete URL of the
  document.
• DOM3 properties are as follows
• document.baseURI returns the absolute base URI of
  the document.
• document.doctype returns the document's type.
• document.documentElement returns the lthtmlgt
  element

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Document Object Properties

1. document.documentMode returns the mode used by
   the browser.
2. document.documentURI returns the URI of the
   document.
3. document.domConfigr returns the DOM
   configuration.
4. document.embeds returns all ltembedgt elements.
5. document.head returns the ltheadgt element.
6. document.implementation returns the DOM
   implementation.
7. document.inputEncoding returns the document's
   encoding .
8. document.lastModified returns the date and time
   the document was updated.
9. document.readyState returns the (loading) status
   of the document.

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Document Object Methods

• Methods are actions that you would like to
  perform on objects.
• DOM has three methods, they are
• getElementById Returns a reference to the first
  object with the particular value of the id
  attribute.
• getElementsByName met Retrieves a collection of
  objects based on the value of the name attribute.
• getElementsByTagName Retrieves a collection of
  objects based on the particular element name.

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Document Object with Forms

• Forms are acts as sub-objects or property of Dom
  objects.
• The Form object represents ltformgt element of
  HTML.
• Forms elements be able to accessed through
  the Dom objects.
• Returns a group of ltformgt  elements.
• Syntax collection document.forms
• ltformgt elements can also access by using
  getElementById()
• Syntax var g document.getElementById(Forms")
  
• ltformgt element can be created with
  document.createElement() 
• Syntax var g document.createElement(form")

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Creating and Deleting Cookies

• Cookies are bits of information stored on the
  user's computer which is been sent by a website.
  EX previously entered URLs, names, and credit
  card numbers etc...
• These are created when you use your browser and
  Keep tracks your activities within the site.
  Session cookies and persistent cookies are two
  types of cookies.
• Session cookies are created temporarily in your
  browser, once you leave the site the session
  cookie is deleted.
• Persistent cookie remains in your browser's
  sub-folder and are activated again you visit the
  same site.

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Creating and Deleting Cookies

• JavaScript uses document.cookie property to
  create and delete the cookies.
• Cookie creation is follows as below
• Syntax document.cookie  "username Aaron
  brooks"
• Deleting a cookie is simple. Just set the expires
  parameter to created cookie
• Syntax document.cookie  "username Aaron
  brooks expiresFriday, 30 Dec 2016 000000
  UTC"

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