keypress | onkeypress event

Fires when the user presses an alphanumeric key.

HTML 4.01 Specification, Section 18.2.3

 

Syntax

HTML Attribute <element onkeypress = "handler(event)">
Event Property object.onkeypress = handler;
attachEvent Method object.attachEvent("onkeypress", handler)
addEventListener Method object.addEventListener("keypress", handler, useCapture)

 

Event information

SynchronousNo
BubblesYes
CancelableYes

 

Event handler parameters

pEvtObj [in]

Type: IHTMLEventObj

Standards information

Remarks

As of Microsoft Internet Explorer 4.0, the onkeypress event fires and can be canceled for the following keys:

  • Letters: A - Z (uppercase and lowercase)
  • Numerals: 0 - 9
  • Symbols: ! @ # $ % ^ & * ( ) _ - + = < [ ] { } , . / ? \ | ' ` " ~
  • System: ESC, SPACEBAR, ENTER

Returns a number specifying the Unicode value of the key that was pressed.

To invoke this event, do one of the following:

  • Press any alphanumeric keyboard key.

Examples

This example shows how to retrieve information from the shiftKeyshiftKey property of the event object. When the user simultaneously presses the shift key and types a character in the first text field, the value "true" appears in the second text field.

Code example: http://samples.msdn.microsoft.com/workshop/samples/author/dhtml/refs/onkeypressEX.htm


<head>
<script type="text/javascript">
function checkKey()
{
if (window.event.shiftKey)  // checks whether the SHIFT key 
						    // is pressed
   {
   txtOutput.value = "true"; // returns TRUE if SHIFT is pressed 
						     // when the event fires
   }
}
</script>
</head>
<body>
<p>Press the SHIFT key while pressing another key.<br>
    <input type="text" name="txtEnterValue" onkeypress="checkKey()"> </p>
<p>Indicates &quot;true&quot; if the shift key is used.<br>
    <input type="text" name="txtOutput"> </p>
</body>

See also

a
abbr
acronym
address
applet
area
audio
b
bdo
big
blockQuote
body
button
canvas
caption
center
cite
code
custom
dd
del
dfn
dir
div
dl
document
dt
em
fieldSet
font
form
hn
hr
i
img
input type=button
input type=checkbox
input type=email
input type=file
input type=image
input type=number
input type=password
input type=radio
input type=range
input type=reset
input type=search
input type=submit
input type=tel
input type=text
input type=url
kbd
label
legend
li
listing
map
marquee
menu
nextID
noBR
object
ol
p
plainText
pre
q
rt
ruby
s
samp
select
small
source
span
strike
strong
sub
sup
table
tBody
td
textArea
tFoot
th
tHead
tr
tt
u
ul
var
video
window
xmp
Reference
onchange
onkeydown
onkeyup

 

 

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