ValueChangeListener Invoked in every post back
----------------------------------------------
Key: MYFACES-102
URL: http://issues.apache.org/jira/browse/MYFACES-102
Project: MyFaces
Type: Bug
Reporter: dani kenan
When the value property is bound to a request scoped managed bean field, e.g.:
<h:selectOneMenu
id="typeName"
value="#{typeListPage.typeName}"
valueChangeListener="#{typeListPage.onChangeTypeName}"
>
<f:selectItems value="#{typeNameSelectItems}" />
<h:selectOneMenu>
The event is fired in every post to the server, even if no change occurred.
The event is fired during the validation phase. This is because the framework
compares the posted value against the value in the bean, not the saved value of
the selectOneMenu ui control.
In order to determine if a value change occured, the value posted in the
request (which is never null) is compared agains the current value of the bean
property (due to the binding #{typeListPage.typeName}). This propety which is
not yet initialized (the bean is in request scope bean - thus typeName is
always null before the update model phase), and the value change event fires.
The problem is simple: change event fires when no event occures.
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