Question

I have a boolean variable and based on whether this is true or false i want to show a field as inputfield or outputfield.

   {!IF(!Showinput), <apex:outputField value="{!a.field1__c}"/>, apex:inputField value="{!a.field1__c}"/>)}
   <apex:inputField value="{!a.field2__c}"/>

When i try to save i get a error

  Error: Attribute value in <apex:inputField> must contain only a formula expression that resolves to a single controller variable or method

Is there any other way of achieving this

Answer 1

Specify both but use rendered attribute to control which one gets rendered

<apex:outputField value="{!a.field1__c}" rendered="{!NOT(Showinput)}"/>
<apex:inputField value="{!a.field1__c}" rendered="{!Showinput}"/>