p:selectOneMenu does not set value in bean

Question

Quick question. This hasn\'t happened to me before when working with SelectOneMenu. This is my code.

Answer 1

If you are working objects in the value, check the equals() function.

Answer 2

I found the error and it was ... quite strange and circumstantial. I added the following line inside the SelectOneMenu:

<p:ajax event="change" update="@this" />

and now it works just fine.

Answer 3

I discovered when I had this problem it was because of the @ViewScoped. Using SessionScoped instead worked fine.

One interesting thing is that in another project, with ViewScoped, it worked. I cannot explain.

Answer 4

<p:selectOneMenu id="listaRegiones" value="#{nuevaProvincia.regionSelect}" required="true">
    <f:selectItems value="#{nuevaProvincia.regiones}" />
</p:selectOneMenu>

should be

<p:selectOneMenu id="listaRegiones" value="#{nuevaProvincia.regionSelect}" required="true">
    <f:selectItems value="#{nuevaProvincia.regiones}" var="region" 
      itemValue = "#{region}"/>
</p:selectOneMenu>

That's why you have to have the ajax call to update whenever there is a change. You are never setting the value.