Visualforce 'Rendered ' parameter not recognising field

Question

I'm trying to display some Visualforce if a checkbox = True. Here is my code snippet:

<apex:outputPanel id="warning" rendered="{!(Innovation__c.Show_Warning__c)}"> 
    <h1 color="red"> WARNING </h1>
</apex:outputPanel>

Here is the error I'm getting:

Unknown property 'Innovation__c.Show_Warning__c' referenced in DisplayRejectionWarning

The API names are correct, I've checked a billion times. Why is it not recognising the field?

Answer 1

You should create a property for the Custom Object in your controller before referencing it in the Visualforce page.

public Innovation__c inv {get; set;}

After creating the property, you can use it in VF page as below:

<apex:outputPanel id="warning" rendered="{!(inv.Show_Warning__c)}"> 
    <h1 color="red"> WARNING </h1>
</apex:outputPanel>

Make sure you add the controller in the VF Page.

Answer 2

You can use Innovation__c.Show_Warning__c in a rendered condition only if you are using StandardController on that Visualforce page as "Innovation__c". Most likely you are using a custom controller/extension.

In that case, your object needs to be created as a property in your controller.

public Innovation__c Innovation {get; set;}

Then you can use Innovation.Show_Warning__c in your rendering conditions.

Answer 3

Thanks for the suggested solutions.

I actually managed to come right by adding the controlling object (Innovation__c) in the tag. Now its recognising the merge field, "Innovation__c.Show_Warning__c".