JSF selectonemenu does not update - jsf

Question

i am beginner in JSF ,i have a problem with selectonemenu item.When i choose the an item ,for example ' FirstLabel',outputpanel should be shown.However ,selectone menu does not update my choice.I use primefaces 3.1 library.How can i solve this problem.Thanks for helps.
<p:selectOneMenu value="#{denemeView.str}" effect="fold" editable="true" >
<f:selectItem itemLabel="Please choose!." itemValue="" />
<f:selectItem itemLabel="FirstLabel" itemValue="1" />
<f:selectItem itemLabel="SecondLabel" itemValue="2" />
<p:ajax process="#this" update=":Form2:panel1"/>
<p:ajax process="#this" update=":Form2:panel2"/>
</p:selectOneMenu>
</p:outputPanel>
<p:outputPanel id="panel1" rendered="#{denemeView.str=='1'}">
<h:outputText value="Output: * " />
<p:inputText id="out" value="#{denemeView.islem}" />
</p:outputPanel>
<p:outputPanel id="panel2" rendered="#{denemeView.str=='2'}">
<h:outputText value="True choice! " />
</p:outputPanel>

Answer 1

If a JSF component has rendered="false" set then it's not redered (the component object is not present in the object tree) and cannot be updated using <p:ajax update="someId"/> or <f:ajax render="someId"/>. What you need to do is wrap these two panels in an outer panel and update that one. Something like this:
<p:ajax process="#this" update="outerPanel"/>
...
<p:outputPanel id="outerPanel">
<p:outputPanel id="panel1" rendered="#{denemeView.str=='1'}">
<h:outputText value="Output: * " />
<p:inputText id="out" value="#{denemeView.islem}" />
</p:outputPanel>
<p:outputPanel id="panel2" rendered="#{denemeView.str=='2'}">
<h:outputText value="True choice! " />
</p:outputPanel>
</p:outputPanel>
See here for a similar problem.