How to prevent deletion in a form ?

Question

I need to prevent deletion in a form if the starting date <= SYSDATE and show an alert .
How do I implement this please ?
My date field is of type timestamp , it's "id2"
I have added the following method in my backing bean :
    public String preventDel() {
long toDateAsTimestamp = id2.getTime();
long currentTimestamp = System.currentTimeMillis();
long getRidOfTime = 1000 * 60 * 60 * 24;
long toDateAsTimestampWithoutTime = toDateAsTimestamp / getRidOfTime;
long currentTimestampWithoutTime = currentTimestamp / getRidOfTime;
if (id2 < currentTimestampWithoutTime )
System.out.println("Display report.");
//how to show the alert ?
return null;
Any help please ?

Answer 1

Hi girl.
If i were you this is how I would do it;
1.- Create a transient attribute in your VO called ToBeDeleted of type boolean and assign its value as the following expression "StartingDate <= adf.currentDate".
2.- Expose the attribute in your bindings. Then, in your delete button you can:
     - Disable it if ToBeDeleted is not true.
     - In the description of the button you could put a message that it cant be deleted.
OR
     Use your java class to show the message. But the alert should be thrown as a facesMessage of type Error: look at this How to show af:message programatically
Also, I would like to say that none of this might be the best way to implement your use case. For the sound of it you have a business rule that should be implemented in your model project if you don't want to break the MVC pattern. (This is that you shouldnt be able to delete the row using your AppModule tester if the startingDate <= Sysdate, for example).
Hope this helps.