Primefaces p：selectOneMenu或p：selectBooleanCheckbox不触发更改事件，具体取决于我是否使用h：form

Question

I'm working with Primefaces 5.3.

First, I implemented functionality to change visibility of ap:selectOneMenu depending on the value of ap:selectBooleanCheckbox according to this post:

Enabling and disabling components via select checkbox

This works so far, if I use the h:form.

Next, I wanted to update the values in the bean, as chosen in the p:selectOneMenu. This is where my question starts: Even if i use p:ajax to explicitly call a listener, it won't get called. This is my code:

 <h:panelGrid>
            <p:selectOneMenu value="#{schedulerCDIBean.selectedParentTask}" var="parentTask"  id="taskDependence" disabled="#{task.dependsOn != 'true'}">

                <p:ajax  event="change" listener="#{schedulerCDIBean.taskToAddListener}"/>

                <f:selectItems id="taskDependenceItems" value="#{schedulerCDIBean.taskWebDataObjectList}"   var="item" itemLabel="#{item.taskName}" 
                itemValue="#{item}"  />

               <p:column>
                   <h:outputText value="#{parentTask}"/>
               </p:column>

    </p:selectOneMenu>
</h:panelGrid>

And here is how I enable/disable the selectOneMenu:

<p:selectBooleanCheckbox id="dependsOnTask" value="#{task.dependsOn}" itemLabel="Depends On">       
        <p:ajax update="taskDependence" process="@this"/>
</p:selectBooleanCheckbox>

All this lives inside ap:tab of the p:accordionPanel where 'task' is the var of my DataObject-List.

As mentioned by @BalusC in this post: commandLink/commandButton/ajax backing bean action/listener method not invoked (Possible Causes: 2),

"You cannot nest multiple UIForm components in each other."

So, if i remove the h:form directive, the call to the listener in the bean works. But now, the value of the p:selectBooleanCheckbox is always set to 'false', and thus the component is not being updated to visible.

I found a post here , where OP had the same problem and solved it by adding the h:form directive.

EDIT: My 'form' is a ui:composition and starts like this <ui:composition template="/templates/pages/mainPage.xhtml"> , where mainPage.xhtml contains h:head and includes the 'header.xhtml' by using ui:include, and there is ah:form. But this h:form is already closed before, so the problem isn't here.

Well, I don't want to go the way with adding the h:form again, as it leads to unspecified behaviour. But what am I doing wrong, if my p:selectBooleanCheckbox values are not being set correctly?

Thank you for your help!

UPDATE

The problem was not the h:form, as it actually wasn't nested. Now I'm just still stuck with the listeners for the p:selectOneMenu, as they aren't being called. I also tried setting partialSubmit="true" on the <p:ajax /> , which did not lead to a solution so far.

Answer 1

Thanks for your help, guys. With your help I fixed the problem.

Just as if someone else experiences similar problems, here a few things to check:

1. Check @BalusC's answer here , as also mentioned in @irieill's answer.
2. Check if you're having equals() and hashCode() of the object you're willing to show in the selectOneMenu.

The solution for my situation actually was mentioned in @irieill's comment:

[..]Not providing a proper converter does not raise any exceptions but faces error messages. So try to add a <p:growl autoUpdate="true" /> to your page to see if any conversion error is raised. If so, add a propper converter to your selectOneMenu .

I think, that's also what @BalusC said at point 3 of his list of possible causes.

See also: How to write a custom converter for <p:pickList> , Custom converter in JSF 2.0 , PrimeFaces ShowCase: SelectOneMenu

Answer 2

As mentioned by @BalusC in this post: commandLink/commandButton/ajax backing bean action/listener method not invoked

Also note point 1. You must enclose your input components with a <h:form /> tag.

Well, I don't want to go the way with adding the h:form again, as it leads to unspecified behaviour.

As i understand, you are misusing the tag or you do not understand how to use it. Just enclose your whole page (or at least all input components) in one <h:form /> tag and it should work.

Can you please update your question with the page code also containing the lines where you placed the <h:form /> tag(s).