Login 
Password
  
 


JavaScript Cert. Exam
Test your skills with our JavaScript certification exam and see how you stack up right now.

Homepage
Visit our homepage and find out more about what NCSA can do for you.

Introduction to JavaScript
Using JavaScript on your Webpage
A Simple JavaScript Application
Variables & Operators
Variables
Operators
Loops & Conditionals
Loops
Conditionals
Document Object Model
Nodes
Functions & Methods
Built-in Functions
User Defined Functions
Forms & Events
Forms
Events
Browsers
Cookies
Image Maps
Timing Events

Learn More About Us
Find out more about how our certifications can benefit you.

Course Descriptions
View a complete listing of certifications available through NCSA.

Employer Programs
Visit our employer programs page and discover the options available to connect you with our customers.

Certificate Database
Lookup a certification in our online database.

Affiliate Program
Make money by helping people get the computer training and certification they need. Sign-up Here!

Support Center
If you have questions or concerns feel free to visit our online support center.


 

The Document Object Model


As mentioned before, JavaScript is object oriented scripting language. Iits real power lies in the way it accesses and manipulates the various elements on a web page. It uses DOM (Document Object Model) API to interact with the contents within the website. DOM is a platform and language independent interface that allows programs and scripts to dynamically access and updates the content, structure, and style of documents.

 

DOM objects are organized in a tree like structure or parent child hierarchy. Because JavaScript uses DOM, it stores components of a web document in a parent child hierarchy, as shown in Figure 1.

 

                                                Figure1

 

The window object is the global object that has all properties and methods. All JavaScript code is executed in this object. The Window object is accessed by typing "window". All variables that you create on a web-page are the properties of the window object and all the functions that you create become the methods of the window object. The “documents” object is the child of ‘window’ object and allows you to access all the elements of a web page such as images, buttons, and links on the web page.

 

To refer to an object, you need to type the parent object name followed by its children object name, separated by period(s). For example to address an image object in a web document, you need to write window.document.image9.

 

Using DOM, JavaScript can load a new page into the browser, open new windows, modify the text of a webpage dynamically, and work with various parts of the browser window or the web document.

 


NCSA OnDemand Training Courses



Web-based Training Courses, including 7,500+ Videos & Articles, covering:

Microsoft Office
2003 | 2007
Microsoft Windows
Vista
Visio
2003 / 2007
OneNote
2003 / 2007
Project
2003 | 2007
Sharepoint
3.0
Access
2003 | 2007
Excel
2003 | 2007
Outlook
2003 | 2007
PowerPoint
2003 | 2007
Word
2003 | 2007
Office for Mac
2008
Excel for Mac
2008
Entourage for Mac
2008
PowerPoint for Mac
2008
Word for Mac
2008

Acrobat 8 Professional ADO.NET 2.0 ASP.NET 2.0 for Visual Basic 2005
C# 2005 Crystal Reports XI Exchange Server 2003
Flash 8 ActionScripting Flash 8 for Designer FrontPage 2003
Mind Manager 7 Pro + Project 2007 Mind Manager 7 Pro Fundamentals Office 2007 - What's New
Photoshop CS2 PHP Programming QuickBooks Pro 2006
SharePoint End User: Administrator SharePoint End User: Contributor SharePoint End User: Reader
Small Business Server 2003 SQL Server 2005 Visual Basic 2005
Windows Server 2003

Order NCSA OnDemand today and get access to over 7500 quality instuctor led videos and training courses covering today's most popular software programs and programming languages.

OnDemand Monthly - $25/month
No long term commitment.
Annual Member - $159/year
Save 50%off monthly price.
Premium - $249/year
Includes NCSA certifications


    

  
HOME    PRIVACY    EMPLOYERS    CERTIFICATION LIST    AFFILIATES    CONTACT US

© 2002-2010 National Computer Science Academy, All Rights Reserved.