Check box hint

Question

Hi all,
I'm using Oracle Forms Builder 10GR2. I have a check box item. I want when it's checked to be non-updatable. So, i put logic in WHEN-CHECKBOX-CHANGED trigger :
Value when checked : Y
Value when unched : N
  if
          :<block>.<item> = 'Y'
               then
                    SET_ITEM_PROPERTY('<block>.<item>', update_allowed,property_false);
           end if;Ok, by this method i'm not able to uncheck the check box once it's checked, but when i go somewhere/or requery the block/ the check box is not checked / although it is non-updatable./
I saw in the property palette of this item that the Check Box mapping of other values is set to Not Allowed.
Any ideas how this can be fixed/to be checked when it is :) /
Thanks in advance,
Bahchevanov.

Answer 1

Hi Bahchevanov,
To quote from the SET_ITEM_PROPERTY Help in Form Builder
>
Modifies all <b>instances</b> of an item in a block by changing a specified item property.
When you specify a change through the SET_ITEM_PROPERTY Built-in, Oracle Forms validates the change before it adjusts the property. If the change is validated, Oracle Forms makes the change and leaves it in effect until another SET_ITEM_PROPERTY changes the same property or the current form is exited.
>
What this means that the changes made are after the Form page has been rendered and last till the page is not rendered again or another SET_ITEM_PROPERTY changes it.
That explains part your observation.
The other factor is the Intial Value you have set for the Checkbox . You have used Y and N for checked and Unchecked, respectively. Now if Intial Value is Null then it is neither Y nor N. So , you need to perhaps set Initial Value : N
Regards,