onchange (HTML attribute)

Spec
Depr. Version
No HTML 4
Browser support (more…)
IE5.5+ FF1+ SA1.3+ OP9.2+
Full Full Full Full

Syntax

onchange="script"

Description

The onchange attribute is used only within the context of a form. It can be applied to an input, a textarea, or a select control to identify when the value of one of those elements is changed either by the user directly, or as a result of some scripting on the page.

Example

In this example, the onchange event calls the checkStockAvailability function:

<input name="orderAmount" size="2" onchange="checkStockAvailability();"/>

Value

This attribute has no fixed value. It’s up to the author to decide on the scripting that’s included here, be that a call to one or more defined functions, or a simple alert() statement.

Compatibility

Internet Explorer Firefox Safari Opera
5.5 6.0 7.0 1.0 1.5 2.0 1.3 2.0 3.0 9.2 9.5
Full Full Full Full Full Full Full Full Full Full Full

Every browser listed supports this attribute. However, inline event handlers such as this should be avoided. In the same way that inline CSS styles are frowned upon but externally defined CSS styles are considered good practice, inline event handlers should be stripped out and replaced with events attached unobtrusively through the DOM.

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