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onchange Event


Fires when the contents of the object or selection have changed.

Syntax

Inline HTML <ELEMENT onchange = "handler" ... > All platforms
Event property object.onchange = handler JScript (compatible with ECMA 262 language specification) only
Named script <SCRIPT FOR = object EVENT = onchange> Internet Explorer only

Remarks

BubblesNo
CancelsYes
To invoke
  • Choose a different OPTION in a SELECT object using mouse or keyboard navigation.
  • Alter text in the text area and then navigate out of the object.
Default action Changed text selection is committed.

This event is fired when the contents are committed and not while the value is changing. For example, on a text box, this event is not fired while the user is typing, but rather when the user commits the change by leaving the text box that has focus. In addition, this event is executed before the code specified by onblur when the control is also losing the focus.

On the SELECT object, this event does not fire programmatically when the SELECTED attribute is changed from one OPTION to another.

Event Object Properties

Although event handlers in the document object model do not receive parameters directly, the handler can query the event object for data.

Event Object Properties

clientXRetrieves the x-coordinate of the mouse cursor relative to the client area of the window, excluding window decorations or scroll bars.
clientYRetrieves the y-coordinate of the mouse cursor relative to the client area of the window, excluding window decorations or scroll bars.
offsetXRetrieves the horizontal coordinate of the mouse's position relative to the object firing the event.
offsetYRetrieves the vertical coordinate of the mouse's position relative to the object firing the event.
returnValueSets or retrieves the return value from the event.
screenXRetrieves the horizontal position of the mouse, in pixels, relative to the user's screen.
screenYRetrieves the vertical position of the mouse, in pixels, relative to the user's screen.
srcElementRetrieves the object that fired the event.
typeRetrieves the event name from the event object.
xRetrieves the x-coordinate of the mouse cursor relative to the parent element.
yRetrieves the y-coordinate of the mouse cursor relative to the parent element.

Example

This example uses the onchange event to retrieve the selected option of a SELECT object.

<BODY>
<FORM>
<P>Select a different option in the
   drop-down list box to trigger the onchange event.
  <SELECT NAME=selTest
     onchange="alert('Index: ' + this.selectedIndex
     + '\nValue: ' + this.options[this.selectedIndex].value)">
    <OPTION VALUE="Books">Books
    <OPTION VALUE="Clothing">Clothing
    <OPTION VALUE="Housewares">Housewares
  </SELECT>
</FORM>
</BODY>

This feature requires Internet Explorer 4.0 or later. Click the icon below to install the latest version. Then reload this page to view the sample.
Microsoft Internet Explorer

Applies To

[ Object Name ]
PlatformVersion
Win16:
Win32:
Mac:
Unix:
WinCE:
INPUT TYPE=text, SELECT, TEXTAREA

See Also

onkeypress



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