Logo

Navigation
  • Home
  • Services
    • ERP Solutions
    • Implementation Solutions
    • Support and Maintenance Solutions
    • Custom Solutions
    • Upgrade Solutions
    • Training and Mentoring
    • Web Solutions
    • Production Support
    • Architecture Designing
    • Independent Validation and Testing Services
    • Infrastructure Management
  • Expertise
    • Microsoft Development Expertise
    • Mobile Development
    • SQL Server Database and BI
    • SAP BI, SAP Hana, SAP BO
    • Oracle and BI
    • Oracle RAC
  • Technical Training
    • Learn Data Management
      • Business Intelligence
      • Data Mining
      • Data Modeling
      • Data Warehousing
      • Disaster Recovery
    • Learn Concepts
      • Application Development
      • Client Server
      • Cloud Computing Tutorials
      • Cluster Computing
      • CRM Tutorial
      • EDI Tutorials
      • ERP Tutorials
      • NLP
      • OOPS
      • Concepts
      • SOA Tutorial
      • Supply Chain
      • Technology Trends
      • UML
      • Virtualization
      • Web 2.0
    • Learn Java
      • JavaScript Tutorial
      • JSP Tutorials
      • J2EE
    • Learn Microsoft
      • MSAS
      • ASP.NET
      • ASP.NET 2.0
      • C Sharp
      • MS Project Training
      • Silverlight
      • SQL Server 2005
      • VB.NET 2005
    • Learn Networking
      • Networking
      • Wireless
    • Learn Oracle
      • Oracle 10g
      • PL/SQL
      • Oracle 11g Tutorials
      • Oracle 9i
      • Oracle Apps
    • Learn Programming
      • Ajax Tutorial
      • C Language
      • C++ Tutorials
      • CSS Tutorial
      • CSS3 Tutorial
      • JavaScript Tutorial
      • jQuery Tutorial
      • MainFrame
      • PHP Tutorial
      • VBScript Tutorial
      • XML Tutorial
    • Learn Software Testing
      • Software Testing Types
      • SQA
      • Testing
  • Career Training
    • Career Improvement
      • Career Articles
      • Certification Articles
      • Conflict Management
      • Core Skills
      • Decision Making
      • Entrepreneurship
      • Goal Setting
      • Life Skills
      • Performance Development
      • Personal Excellence
      • Personality Development
      • Problem Solving
      • Relationship Management
      • Self Confidence
      • Self Supervision
      • Social Networking
      • Strategic Planning
      • Time Management
    • Education Help
      • Career Tracks
      • Essay Writing
      • Internship Tips
      • Online Education
      • Scholarships
      • Student Loans
    • Managerial Skills
      • Business Communication
      • Business Networking
      • Facilitator Skills
      • Managing Change
      • Marketing Management
      • Meeting Management
      • Process Management
      • Project Management
      • Project Management Life Cycle
      • Project Management Process
      • Project Risk Management
      • Relationship Management
      • Task Management
      • Team Building
      • Virtual Team Management
    • Essential Life Skills
      • Anger Management
      • Anxiety Management
      • Attitude Development
      • Coaching and Mentoring
      • Emotional Intelligence
      • Stress Management
      • Positive Thinking
    • Communication Skills
      • Conversation Skills
      • Cross Culture Competence
      • English Vocabulary
      • Listening Skills
      • Public Speaking Skills
      • Questioning Skills
    • Soft Skills
      • Assertive Skills
      • Influence Skills
      • Leadership Skills
      • Memory Skills
      • People Skills
      • Presentation Skills
    • Finding a Job
      • Etiquette Tips
      • Group Discussions
      • HR Interviews
      • Interview Notes
      • Job Search Tips
      • Resume Tips
      • Sample Resumes
 

JavaScript Event Object

By Exforsys | on May 20, 2007 |
JavaScript Tutorial

JavaScript Event Object

In this JavaScript tutorial you will learn about JavaScript event object, properties of event object, altKey, ctrlKey and shiftKey, button, integer value action representation, cancelBubble, clientX and clientY, fromElement and toElement, height and width.

event Object:

The event object is a browser object used to get information about a particular event specified. Using event object, users can access information about event happenings. The difference between event object and Event object is such that the latter gives constants that can be used to identify events, while the former is used to get information about events.

Properties of event Object:

  • altKey,ctrlKey and shiftKey
  • button
  • cancelBubble
  • clientX
  • clientY
  • fromElement
  • toElement
  • height
  • width
  • keycode
  • layerX
  • layerY
  • modifiers
  • offsetX
  • offsetY
  • pageX
  • pageY
  • reason
  • returnValue
  • screenX
  • screenY
  • srcElement
  • srcFilter
  • target
  • type
  • which
  • x and y

In the above list, some of the events are supported with Internet Explorer Browser and some with Navigator browser, which will be detailed. Some of the properties of event object are explained below.

altKey, ctrlKey and shiftKey:

The above property is used to indicate whether the Alt Key, Control Key or Shift Key was pressed by the user when the event occurred. The indication is known by appropriately setting the value as true or false. This property takes a boolean value as its return type. Both Internet Explorer and Navigator support this property. In Navigator, there is an extra property called metaKey which is not supported by Internet Explorer. This indicates if the user has pressed Meta key when the event occurred.

button:

The button property of event object is used to denote whether the mouse button was pressed or released when the event occurred. The indication is performed by means of an integer value where the values listed below are returned as per the action when the event occurred. The return value from button property is an integer.

Integer Value Action Representation


0
no Button was pressed
1 Left Mouse Button was pressed
2 Right Mouse Button was pressed
4 Middle Mouse Button was pressed

Sometimes, user presses more than one button at the same time when the event occurs. To indicate such a situation, the integer representation would take the sum of integer representations of buttons pressed by the user.

For example, if a user presses both the right and the middle button, then addition of the integer representations of right and middle button gives 2+4=6 is returned by the property. This property is supported both by Internet Explorer and Navigator. In Navigator, the integer representation values differ:

Integer Value Action Representation


0
Left Mouse Button was pressed
2
Right Mouse Button was pressed
1
Middle Mouse Button was pressed

cancelBubble:

cancelBubble property of event object is used for enabling or disabling the event bubbling concept of an event object.  Event bubbling concept will be discussed in the next section of this tutorial. This property enables and disables event bubbling by setting the boolean value appropriately as true or false as needed. The value of the property cancelBubble is set to true to prevent the event from bubbling and if it is set to false, the event bubbling is enabled. Only Internet Explorer supports this property. In Navigator, to implement the same property, the programmer has to use the method associated with event object (to be discussed in the methods of event object section).

clientX and clientY:

This property of event object indicates the cursor’s horizontal and vertical position when the event occurs relative to the upper-left corner of the window. The denoted value would be in terms of pixels. Both by Internet Explorer and Navigator support this property.

Syntax for using this property is as follows:


event.
clientX
event.
clientY

fromElement and toElement:

These properties are supported only in Internet Explorer and denote the HTML element. The event moves from or to, respectively, for fromElement and toElement. The properties fromElement and toElement each denote, respectively, the elements the mouse is leaving from and moving onto. In Navigator, the property named relatedTarget is used to achieve the same result. In case of a mouseover event, the relatedTarget property of event object denotes the element that the mouse has left. In case of mouseout event, the relatedTarget property of event object denotes the element that the mouse has entered.

height and width:

The height and width property of event object is only supported by Navigator and it indicates the height and width of window or frame, respectively. The value is denoted in pixels.

« « Literature Can Enhance Your Vocabulary
JavaScript Frame object » »

Author Description

Avatar

Editorial Team at Exforsys is a team of IT Consulting and Training team led by Chandra Vennapoosa.

Free Training

RSSSubscribe 392 Followers
  • Popular
  • Recent
  • JavaScript Features

    April 24, 2007 - 0 Comment
  • JavaScript Objects

    August 12, 2007 - 0 Comment
  • JavaScript Location Object

    July 4, 2007 - 0 Comment
  • JavaScript Events Handling

    May 20, 2007 - 0 Comment
  • JavaScript Frame object

    May 20, 2007 - 0 Comment
  • Working with JavaScript DOM Objects

    June 4, 2007 - 0 Comment
  • JavaScript String Object

    August 12, 2007 - 0 Comment
  • JavaScript Window Object Timeout Methods

    August 8, 2007 - 0 Comment
  • JavaScript Event Handler

    August 2, 2007 - 0 Comment
  • JavaScript Browser Objects Part 2

    June 13, 2007 - 0 Comment
  • JavaScript Objects

    August 12, 2007 - 0 Comment
  • JavaScript String Object

    August 12, 2007 - 0 Comment
  • JavaScript Date Object

    August 12, 2007 - 0 Comment
  • JavaScript Math Object

    August 9, 2007 - 0 Comment
  • JavaScript Windows Object Properties Part II

    August 9, 2007 - 0 Comment
  • JavaScript Windows Object Properties Part I

    August 8, 2007 - 0 Comment
  • JavaScript Window Object Timeout Methods

    August 8, 2007 - 0 Comment
  • JavaScript Document Object Methods Part II

    August 7, 2007 - 0 Comment
  • JavaScript Document Object Methods Part I

    August 5, 2007 - 0 Comment
  • JavaScript History Object Properties and Methods

    August 5, 2007 - 0 Comment

Exforsys e-Newsletter

ebook
 

Related Articles

  • JavaScript Objects
  • JavaScript String Object
  • JavaScript Date Object
  • JavaScript Math Object
  • JavaScript Windows Object Properties Part II

Latest Articles

  • Project Management Techniques
  • Product Development Best Practices
  • Importance of Quality Data Management
  • How to Maximize Quality Assurance
  • Utilizing Effective Quality Assurance Strategies
  • Sitemap
  • Privacy Policy
  • DMCA
  • Trademark Information
  • Contact Us
© 2023. All Rights Reserved.IT Training and Consulting
This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish.AcceptReject Read More
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Non-necessary
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
SAVE & ACCEPT