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onfocus JavaScript (JS) Example

Description: Illustrates the JavaScript syntax for the onfocus Event.
Syntax: Object.onfocus="yourjavascriptcode()" – Allows you to know when onfocus event occurs.
onfocus 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: onfocus </title>
 
<!-- 
***************************************************
* This example is from http://idealprogrammer.com *
***************************************************
*****************************************************
 DOM Objects
*****************************************************
 
 
*****************************************************
***    DOM Event - EventHandlers   ***
*****************************************************
 
*****************************************************
*** onfocus                                       
*****************************************************
 
SYNTAX:
object.onfocus="yourjavascriptcode()"  Allows you to know when object
has focus.
 
=================================================================
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 for example 1 -->
<script type="text/javascript">
 
function highlightField(e) {
    if (!e) var e = window.event
    // e refers to the event
    //var string = printInfo(e);
    this.style.background = "yellow";
 
}
 
function unhiglightField(e) {
    if (!e) var e = window.event
    // e refers to the event
    //var string = printInfo(e);
    this.style.background = "white";
 
}
 
</script>
 
<!-- Script for example 2 -->
<script type="text/javascript">
    function inlineHighlight(x) {
        document.getElementById(x).style.background = "yellow"
    }
 
    function inlineunHighlight(x) {
        document.getElementById(x).style.background = "white"
    }
</script>
 
 
</head>
<body>
<h2>Example #1: Demonstrates onfocus for highlighting field using recommended technique for registering events</h2>
 
State:     <input type="text"
 id="state" />
<br /><br />
Country: <input type="text"
 id="country" />
 
<br />
<br />
 
 
<!-- Script for example 1 -->
<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 state = document.getElementById("state")
state.onfocus = highlightField;
state.onblur = unhiglightField;
 
var country = document.getElementById("country")
country.onfocus = highlightField;
country.onblur = unhiglightField;
 
 
 
 
</script>  
<hr />
 
<h2>Example #2: Using In-line javascript is simplier, but blurs structure and behavior</h2>
 
 
Address1: <input type="text"
onfocus="inlineHighlight(this.id)" onblur="inlineunHighlight(this.id)" id="Text1" />
<br /> <br />
Address2: <input type="text"
onfocus="inlineHighlight(this.id)" onblur="inlineunHighlight(this.id)" id="Text2" />
</body>
 
</html>