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onClick JavaScript (JS) Example

Description: Illustrates the JavaScript syntax for the onClick Event.
Syntax: Object.onClick="yourjavascriptcode()" – Allows you to know when text or selection for element has changed.
onClick JavaScript (JS) Example Code:

< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html>
<head>
<title>IdealProgrammer.com: onClick </title>
 
<!-- 
***************************************************
* This example is from http://idealprogrammer.com *
***************************************************
*****************************************************
 DOM Objects
*****************************************************
 
 
*****************************************************
***    DOM Event - EventHandlers   ***
*****************************************************
 
*****************************************************
*** onClick                                       
*****************************************************
 
SYNTAX:
object.onClick="yourjavascriptcode()"  Allows you to know when click
event occurs
 
=================================================================
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
 
 
-->
<script type="text/javascript">
 
 
 
// Arrays of possible properties
 
var theTargets = new Array(
	'target',
	'relatedTarget',
	'currentTarget',
	'originalTarget',
	'srcElement',
	'fromElement',
	'toElement'
);
 
var theMouse = new Array(
	'clientX',
	'clientY',
	'x',
	'y',
	'layerX',
	'layerY',
	'screenX',
	'screenY',
	'offsetX',
	'offsetY',
	'pageX',
	'pageY',
	'which',
	'button',
	'detail',
	'wheelDelta'
);
 
var theKeys = new Array(
	'modifiers',
	'which',
	'keyCode',
	'charCode',
	'isChar',
	'shiftKey',
	'shiftLeft',
	'metaKey',
	'altKey',
	'altLeft',
	'ctrlKey',
	'ctrlLeft'
);
 
var theType = new Array(
	'type',
	'eventPhase',
	'bubbles',
	'cancelable',
	'cancelBubble',
	'detail',
	'returnValue',
	'timeStamp',
	'view'
);
 
 
function writeAvailableProperties() {
    document.write(event.altkey + " - altKey	     Retrieves a value that indicates the state of the ALT key.<br />");
    document.write(event.clientX + " - 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.<br /><div style='background-color:Yellow;border-color:black;border-style:solid;border-width:1px;'> Please use browser back button to return to previous page</div><br /><br />");
}
function doSomething(e) {
    if (!e) var e = window.event
    // e refers to the event
    var string = printInfo(e);
	alert(string);
 
}
 
 
 
 
// Print out property information based on user checking of form
 
function printInfo(e)
{
	var printstring = '';
	if (this.id) printstring +=	'Event is now in layer ' + this.id + '\n\n';
	var possibilities = document.forms[0].elements;
	for (var i=0;i<possibilities .length;i++)
	{
		if (possibilities[i].checked)
		{
			var thearray = self[possibilities[i].name];
			for (var j=0;j<thearray.length;j++)
			{
				var current = e[thearray[j]];
				var curr = typeof current;
//				alert(thearray[j] + ' is ' + curr);
				if (curr == 'undefined' || (curr == 'object' && !current)) continue;
				if (possibilities[i].name == 'theTargets')
				{
					var tag = (current.tagName) ? current.tagName : '[unknown tag]';
					var tagid = (current.id) ? current.id : '[no id]';
					printstring += '\n' + thearray[j] + ' = ' + tag + ' ' + tagid;
 
				}
				else
					printstring += '\n' + thearray[j] + ' = ' + current;
 
			}
		}
	}
	if (!printstring) printstring = 'Alert required for example\nUse checkboxes to see useful information';
	return printstring;
}
 
function doConfirm() {
    return confirm('Do you really want to follow this link?')
}
 
</script>
 
 
</possibilities></script></head>
<body>
<h2>Example #1: Check the categories and click button to see onClick Attributes</h2>
 
<form>Show
<input type="checkbox" name="theType"/> type/misc
<input type="checkbox" name="theTargets"/> targets
<input type="checkbox" name="theMouse"/> mouse stuff
<input type="checkbox" name="theKeys"/> key stuff
</form>
 
<br />
<br />
 
<input id="Button1" type="button" value="button" />
 
<script type="text/javascript">
 
// This is the "traditional" and recommended technique for registering an event
// handler because it allows you to separate structure from behavior; the
// "inline" method of registering an event within xhtml tags is not
// the recommended approach because it blurs structure and behavior.
// For complete explanation, please see the following excellent article:
// http://www.digital-web.com/articles/separating_behavior_and_structure_2/
//
// Note: Using getElementById so registering event will work in FireFox
//
var mybutton = document.getElementById("Button1")
mybutton.onclick = doSomething;
if (mybutton.captureEvents) mybutton.captureEvents(Event.CLICK);
</script>  
<hr />
<h2>Example #2: Click Link Below to See onClick Prevent Default Behavior</h2>
 
<a href="http://idealprogrammer.com" onclick="return doConfirm()">Ideal Programmer</a>
 
<p>When onclick is passed a false return value, the default behavior (going to the 
new page) is prevented.</p>
<hr />
<h2>Example #3: Click Link Below to See onClick Copy Example</h2>
 
FieldA: <input type="text" id="fieldA" value="Copy Me!" />
<br />
FieldB: <input type="text" id="fieldB" />
<br /><br />
Click the button below to copy the content of FieldA to FieldB.
<br />
<button onclick="document.getElementById('fieldB').value=
document.getElementById('fieldA').value">Copy</button>
 
 
 
 
</body>
 
</html>