I'm trying to create a condition on a VF page to show me a field only if the two conditions are met. (I.e. I want to use the 'rendered' attribute twice)

Here is my code:

<apex:inputField value="{!pa.Permanent_User_ID_Collection__c}" 
rendered="{!!DRD_Submited + !recordTypeIsPPDetect == 'Platform_Detect'}"/>

And this is the error I get:

"Incorrect parameter type for operator '+'. Expected Number, Date, DateTime, received Boolean"

3 Answers 3


As mentioned you should use boolean methods as AND(value1, value2, ...) and NOT(value1)

    rendered="{!AND(NOT(DRD_Submited), recordTypeIsPPDetect == 'Platform_Detect')}"

From design point of view you should not create complex conditions but instead create and use controller property that will isolate field visibility logic of type either Boolean (for single field) or Map<Id, Boolean> (for collection of records)


You can use following:

<apex:inputField value="{!pa.Permanent_User_ID_Collection__c}" 
rendered="{!(!DRD_Submited && (recordTypeIsPPDetect == 'Platform_Detect'))}"/>
  • The ! should only be used at the beginning of the merge field; elsewhere, it acts as a NOT operator, which is probably not the user's intent.
    – sfdcfox
    Commented Nov 1, 2016 at 16:17
  • Tried to execute what you suggested but I get a similar error: Incorrect parameter type for operator '='. Expected Boolean, received Text
    – Json
    Commented Nov 1, 2016 at 17:23
  • Please check the updated ans Commented Nov 1, 2016 at 19:32

For multiple conditions on a rendered attribute, you can also use AND and OR. Example: rendered="{!AND(condition_1,condition_2)}"

For your case, try rendered="{!DRD_Submited && recordTypeIsPPDetect == 'Platform_Detect'}", or rendered="{!AND(DRD_Submited,recordTypeIsPPDetect == 'Platform_Detect')}".

  • It actually does compile, however it does not show the field on the VF Page. The field does exist because if I only use : rendered="{!!DRD_Submited} then the field appears.
    – Json
    Commented Nov 1, 2016 at 17:23
  • As someone commented in the other answer, multiple "!" signs will operate as negate effect. I have edited my answer to something that should work for you. Commented Nov 1, 2016 at 18:46

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