Hello,

   I have used various boards and forums to come up with a fairly simple output panel to rerender some areas of a VF page.

I have a created a tabbed contact view VF page.  I have a 'Interventions' tab that lists the interventions (custom object) associated with this contact.  Here is the code for the tab...

<apex:tab label="Interventions" name="Interventions" id="tabInterventions">
        <apex:form>
        <apex:pageBlock title="Interventions">
            <apex:dataTable value="{!MyInterventions}" var="int" columns="2">
                <apex:column>
                <apex:facet name="header"><b>Name</b></apex:facet>
                    <apex:commandLink action="{!invokeService}"
                                      value="{!int.name}"
                                      rerender="resultPanel">
                        <apex:param name="id" value="{!int.id}"/>
                    </apex:commandLink>

                </apex:column>
                
                <apex:column headerValue="Current Stage">
                    {!int.Current_Stage__c}
                </apex:column>
                
            </apex:dataTable>
         
        </apex:pageBlock>
        </apex:form>
        <apex:pageBlock>
               <apex:outputPanel id="resultPanel" layout="block">
                   <apex:detail subject="{!fetchedData}"/>
               </apex:outputPanel>         
         
        </apex:pageBlock>
         
</apex:tab> 

 and here are the corresponding methods from the controller extension

    public List<Intervention__c> getMyInterventions()
    {
        myInts = [select Name, id, Current_Stage__c from Intervention__c where Contact__c =:cntact.id];
        return myInts;
    }
    
    public Intervention__c getFetchedData(){
    
        return result;
        
    }
    
    public PageReference invokeService() {

        Id id = System.currentPageReference().getParameters().get('id');
        result = [SELECT Name, Current_Stage__c FROM Intervention__c WHERE Contact__c=:id];
        return null;
    }

This works wonderfully if I have only 1 intervention assiociated witht the contact, but if there is more than 1, I get the following error

 System.QueryException: List has more than 1 row for assignment to SObject   

I know what is causing my issue, my invokeService is returning a list of all the interventions associated with that Contact.  I just don't know how to fix it.  How do I make sure that I am querying only the intervention that was clicked on.  How do I get that Id of the intervention that was clicked so that I can query for it in my invokeService method?

Or if I'm way off on all of this, how do I accomplish this better?

Also have a part 2 of the question.

Once this is fixed, how do I reset the output panel every time the user navigates away from teh interventions tab.  Right now (assuming I have only 1 intervention for that contact, which is the only way it works) once I click on the intervention, the output panel re renders to that intervention.  Which is great, but I want to make sure if they navigate to another tab on the tabpanel, that output panel resets itself, because right now it stays on the selected intervention.  Basically I want to blank it out if the user navigates away from the interventions tab.

Thanks a million in advance for any help.

Chris