[SalesForce] Conditionaly render input field on Visualforce page

I can't figure out what it is I am doing wrong with this code. I would like to only render the Service_Account__c.CM_Service__c field based upon the value of the checkbox field Service_Account__c.To_be_used__c.

As it is now, the CM_Service__c field will never render, regardless of what values I put into the logic true or false. 

<apex:pageblocksection title="Settings (If Applicable)" showheader="true" columns="1" >
     <apex:inputfield value="{!Service_Account__c.To_be_used__c}" required="false"> 
       <apex:actionSupport event="onchange" reRender="SERV" />                    
     </apex:inputField>

     <apex:inputfield id="SERV" value="{!Service_Account__c.CM_Service__c}" required="false" rendered="{IF(!Service_Account__c.To_be_used__c == true,true,false)}" />                         
</apex:pageblocksection>

Any ideas ? Is it just a syntax error I'm not catching…?

Best Answer

You need to rerender the parent element with conditionally rendered elements

<apex:pageblocksection id="rerenderme" title="Settings (If Applicable)" 
       showheader="true" columns="1" >
     <apex:inputfield value="{!Service_Account__c.To_be_used__c}" required="false"> 
       <apex:actionSupport event="onchange" reRender="rerenderme" />                    
     </apex:inputField>

     <apex:inputfield id="SERV" value="{!Service_Account__c.CM_Service__c}" 
       required="false"rendered="{!Service_Account__c.To_be_used__c}" />                         
</apex:pageblocksection>

And your rendered attribute can be shortened to just the field value (also fixing the improper IF which was written incorrectly but was not needed anyway)

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