Button condition on page item and Validation error Conflict

Question

Hi,
I have a select list page item and a button on page whose condition is based on the select list page item value(eg, If (:P2_item1='val1'){return true;}) with condition type=PL/SQL function returning boolean. This buttons submits the page.
It' coming fine in normal case. However, if I select some value val2 from the list and then click the button, and if there are any validation errors (like mandatory check or email check fail etc), then the button disappears because it evaluates the button condition based on the changed value(val2), but the page has not yet been submitted because of validation errors.
I think this can be solved if I create the button condition based upon database column value instead of page item as db col value won't change until the page is submitted.
This look like very basic use-case and I would like to know if there is any better solution to this problem.
Note: I am using Apex 4.2.1

Answer 1

I don't want to show/hide the button on the change of the page item lov value, so i am not using Dynamic action.
What i was is to make button visible based on a condition(which is based on page item), for which we have condition attribute of a button available.
This is a very common thing where a user chooses the button condition as Value of item/column in expression 1 is null/expr2. But what if the user changes the page item value but it doesn't get submit due to validation error. In that case, the button condition fails.
So, i guess i have to use column name in expression 1, can u tell how to do that?
Expression 1 = IF (:P2_STATUS='val1') then return true;
How to change the above to use db column 'status' instead? Any direct way(like #Status#) or I have to query db to get it using select.
Any alternative approach?