I'm trying to use visualforce to perform the following:

A. Show related lists (and all headings) only if a related record exists.

B. If a related record does not exist, the particular section is not displayed.

 

I'm trying to use the apex:relatedList tag with the rendered attribute.

 

Is it possible to check if the list is empty as a boolean expression within visualforce without having to create a custom controller method? I have a working solution, but if I want to add this functionality for all related lists, it's a lot of extra controller code to write.

 

Thanks in advance.

 

 

VisualForce View Page

<apex:page standardController="Account" extensions="AccountHiddenListController">
    <apex:detail relatedList="false">
        <apex:relatedList list="Opportunities" rendered="{!relatedOpportunitiesExist}">    
        </apex:relatedList>
    </apex:detail>
</apex:page>

 

 

Controller Code:

public class AccountHiddenListController
{
    private final Account account;
    private boolean relatedOpportunitiesExist;
   
    public AccountHiddenListController (ApexPages.StandardController accountController)
    {
        this.account = (Account) accountController.getRecord();
    }
   
    public boolean getRelatedOpportunitiesExist()
    {
        if (this.relatedOpportunitiesExist != null)
        {
            return this.relatedOpportunitiesExist;
        }
   
        List<Opportunity> opp = this.getOpportunitiesList();
        if (opp.size() > 0)
        {
            this.relatedOpportunitiesExist = true;
        }
        else
        {
            this.relatedOpportunitiesExist = false;       
        }
        return this.relatedOpportunitiesExist;
           
    }
   
    public void setRelatedOpportunitiesExist()
    {
   
    }
   
    public List<Opportunity> getOpportunitiesList()
    {
        if (this.account == null)        
            return null;       
        return [select o.id
        from Opportunity o
        where o.AccountId = :account.id];
       
    }
   
}