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MutationEvent.prevValue (Property)

When an attribute changes, the old attribute value is available here.

Availability:

DOM level - 2
JavaScript - 1.5
Netscape - 6.0
Property/method value type:String primitive
JavaScript syntax:NmyMutationEvent.prevValue

This value preserves the old attribute value so you can restore it into the attribute if you inspect the new value and find that it is inappropriate.

See also:MutationEvent.attrChange, MutationEvent.attrName, MutationEvent.newValue

Property attributes:

ReadOnly.

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JavaScript Programmer's Reference, Cliff Wootton
Wrox Press (www.wrox.com)

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