onunload JavaScript (JS) Example: HTML DOM Objects – Event – onunload JavaScript (JS) Example

onunload JavaScript (JS) Example: HTML DOM Objects – Event – onunload JavaScript (JS) Example

Purpose: – Illustrates the for the .

View Other Attributes and Handlers for DOM Events

Prerequistes:

Syntax: Object.onunload=”yourjavascriptcode()” – Allows you to know when window or frame is unloaded.

Restrictions: None

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new files to it.

Instructions:

  1. Use Visual Web Developer 2008
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select C-Sharp for language
    • name of Web Site could be JavaScript_Syntax.
  3. Folder

  4. Add New folder named “HTMLDOMObjects”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder should be: HTMLDOMObjects
  5. Add New subfolder to “HTMLDOMObjects” folder named “DOMEvent”
    • Right-click folder named “HTMLDOMObjects” in solution explorer;
    • add new folder;
    • name of folder should be: DOMEvent
  6. Add New subfolder to “DOMEvent” subfolder named “EventHandlers”
    • Right-click subfolder named “DOMEvent” in solution explorer;
    • add new folder;
    • name of folder should be: EventHandlers
  7. Add HTML Page Named onunload to EventHandlers subfolder
    • Right-click EventHandlers subfolder;
    • add new item;
    • Select HTML Page
    • HTML Page name should be onunload
  8. Click on copy code in code below to copy code into HTML Page onunload.htm
  9. Right-click on HTML page onunload.htm and select view in browser
View Example In Browser
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
   <title>IdealProgrammer.com: onunload </title>
 
<!-- 
***************************************************
* This example is from http://idealprogrammer.com *
***************************************************
*****************************************************
 DOM Objects
*****************************************************
 
 
*****************************************************
***    DOM Event - EventHandlers   ***
*****************************************************
 
*****************************************************
*** onunload                                       
*****************************************************
 
SYNTAX:
object.onunload="yourjavascriptcode()"  Allows you to know when window
or frame is unloaded. 
 
=================================================================
An EXCELLENT tutorial on event basics can be found at:
http://www.quirksmode.org/js/introevents.html
=================================================================
 
You can access the following properties thru the event handler:
 
Available Properties
altKey	     Retrieves a value that indicates the state of the ALT key.
altLeft      Retrieves a value that indicates the state of the left ALT key.
clientX	     Sets or retrieves the x-coordinate of the mouse pointer's position relative to the client area of the window, excluding window decorations and scroll bars.
clientY	     Sets or retrieves the y-coordinate of the mouse pointer's position relative to the client area of the window, excluding window decorations and scroll bars.
ctrlLeft	 Sets or retrieves the state of the left CTRL key.
offsetX	     Sets or retrieves the x-coordinate of the mouse pointer's position relative to the object firing the event.
offsetY	     Sets or retrieves the y-coordinate of the mouse pointer's position relative to the object firing the event.
returnValue	 Sets or retrieves the return value from the event.
screenX	     Sets or retrieves the x-coordinate of the mouse pointer's position relative to the user's screen.
screenY	     Sets or retrieves the y-coordinate of the mouse pointer's position relative to the user's screen.
shiftLeft	 Retrieves the state of the left SHIFT key.
srcElement	 Sets or retrieves the object that fired the event.
type	     Sets or retrieves the event name from the event object.
x	         Sets or retrieves the x-coordinate (in pixels) of the mouse pointer's offset from the closest relatively positioned parent element of the element that fired the event.
y	         Sets or retrieves the y-coordinate (in pixels) of the mouse pointer's offset from the closest relatively positioned parent element of the element that fired the event.
 
 
The captureEvents() method captures all the events of the event type passed.
 
When you have multiple events to capture, separate them with the pipe, |, character.
 
Here are the types of event you can capture:
 
Event.ABORT
Event.BLUR
Event.CHANGE
Event.CLICK
Event.DBLCLICK
Event.DRAGDROP
Event.ERROR
Event.FOCUS
Event.KEYDOWN
Event.KEYPRESS
Event.KEYUP
Event.LOAD
Event.MOUSEDOWN
Event.MOUSEMOVE
Event.MOUSEOUT
Event.MOUSEOVER
Event.MOUSEUP
Event.MOVE
Event.RESET
Event.RESIZE
Event.SELECT
Event.SUBMIT
Event.UNLOAD
 
 
-->
</head>
<body onunload="alert('The onunload event was triggered')">
<h2>Close this window to see unload event fire</h2>
</body>
</html>