Outputlink's value with If statement

Question

Within my Wrapper Contact's list, I do have Contact records without Accounts. I wanted to have a condition such that the account label is clickable only when there is an Account to that Contact record. Here is what I have implemented, which gets me an error

<apex:column headerValue="Account">
    <apex:outputLink target="_parent" value="{!If(NOT(ISNULL(URLFOR($Action.Account.View, c.actId))), URLFOR($Action.Account.View, c.actId), '#')}" >
          {!c.accName}
    </apex:outputLink>
</apex:column>

Error:

Content cannot be displayed: Invalid parameter for function URLFOR

Note: Only few contacts have the AccountIds as null. Where am I doing wrong?

Refernced this link before posting.

Answer 1

Instead of checking whether the URLFOR() function returns null, conditionally render the whole component by wrapping it in an <apex:outputPanel>.

<apex:outputPanel rendered="{! NOT(ISBLANK(c.actId)) }">
    <apex:outputLink value="{! URLFOR($Action.Account.View, c.actId) }" ...>
    ...
</apex:outputPanel>

That way you won't try to render components that don't make sense or cannot be evaluated with a null Id value (it's passing a null Id to URLFOR() that's generating this error, since it gets evaluated inside your IF() even if its result isn't used).