valueChangeListener reacting only on second try?

[acgrama]

Hello all,

I have two drop down lists and I want to load the second one with values based on what was chosen in the first one. However, the onchange event is only detected the second time I change the selection!

The relevant bits of the xhtml:

<ui:define name="body">
<h:form>
<h:panelGrid columns="2">
    <rich:inplaceSelect value="#{searchSimilarProblems.problematicArea}" 
       valueChangeListener="#{searchSimilarProblems.problematicAreaValueChanged}" defaultLabel="Click here to select">
        <f:selectItems value="#{searchSimilarProblems.problematicAreas}"/>
        <a4j:support event="onchange" reRender="items"/>
    </rich:inplaceSelect>
    <a4j:outputPanel id="label">
        <h:outputText value="Choose concrete product:" />
    </a4j:outputPanel>  
    <a4j:outputPanel id="items">
        <rich:inplaceSelect value="#{searchSimilarProblems.impactedElement}" defaultLabel="Click here to select">
            <f:selectItems value="#{searchSimilarProblems.impactedElements}"/>
        </rich:inplaceSelect>
    </a4j:outputPanel>
</h:panelGrid>
</h:form>
</ui:define>

And in my bean I have

public void problematicAreaValueChanged(ValueChangeEvent event)

The problem is that problematicAreaValueChanged() is invoked only when I modify the value of the problematic area for the second time (and I get a null for the event's oldValue).

Does anyone have an idea regarding what might be wrong? Thanks in advance! I am using Seam 2.2.0 and Java 1.6.0.19, if that helps.
--Cristina.

[gaborj]

Hi,

I think a valueChangeListener is not what you want to use here. Read more about it e.g. here...

But you already have an

<a4j:support event="onchange" reRender="items"/>

try to update your model by this event like:

<a:support event="onchange" 
    action="#{yourBean.yourMethod()}" 
    reRender="items"  
    ajaxSingle="true" 
    eventsQueue="yourQ"
    requestDelay="100"/>

[acgrama]

Thanks for the suggestion! I will try it out.

In the meantime I managed to make it do what I need by using the event onviewactivated. (With event onchange, it seemed like the event's newValue was constantly one step behind: I had two choices in my first drop down list, when I chose 1, newValue was still 2, then I chose 2 and newValue would become 1, then choosing 1 again made newValue become 2 and so on...)