Af:ConvertDateTime how to control the year to start with 19xx or 20xx

Question

Hi,
I am facing an issue. I have a af:inputDate component with af:convertDateTime with pattern MM/dd/yyyy and secondary pattern= MMddyyyy.
The issue is when the date is entered as 101147 the date gets converted to 10/11/2047 but the user wants it to be converted to 10/11/1947
Th requirement is if the two digits entered for year(yy) is less than the last two digits current year(2011) the year should be 20yy else it should be 19yy
example: if entered date is 052104 it should get converted to 05/21/2004
if entered date is 062198 it should get converted to06/21/1998
if the entered date is 07132009 it should be 07/13/2009 (no conversion here)
if the entered date is 07131986 it should be 07/13/1986 (no conversion here)
Kindly reply

Answer 1

This one is a tricky problem - a side-effect of JSF doing a lot of things automatically is that sometimes it does too much.
I don't have a great solution, but here's a couple of ideas:
(1) Try using multiple <h:form>s on your page (not nested one inside the other, but separate). Data will only get updated in the form that contains the button that got pressed.
(2) Use an intermediate model layer, and discard updates as appropriate.
Neither of these are beautiful solutions - the second is way ugly - but they might help. Long-range, I'd love to see something like "subforms" supported in JSF that can provide finer grained control over what gets processed (validations, model pushes, etc.) and what doesn't without resorting to the blunt hammer of multiple HTML forms.
I'm a little confused about "the model is updated with the value of the components whenever the form is submitted, and regardless of whether the value of the components has changed or not.", because JSF is checking the old value and using ".equals()" to see if its changed. Note, however, that it's not caching the old value across the request, but simply going back to the model on the subsequent request, which may (or may not) explain the behavior you're seeing.
-- Adam Winer (EG member)