End date should not less than Start date, else CLEAR it

Question

Hello
I put CONTRACT START DATE and CONTRACT END DATE fields on the form. These 2 objects (Date/Time objjects) i pulled them from Satndard tab of pallette and dropped on my layout page design, fine.
Now, am trying to put a validation that the end dat eshould not lower than start date, so, i got a thread as below from Niall,
http://forums.adobe.com/message/1909551
and i did my FormCalc coding under EXIT event of END DATE field as below,
// Pls. note this FormCalc
// End date should not less than Start date, else CLEAR it - Begin
var stDate
var endDate
stDate = xfa.resolveNode("CUSTOMER.Page31_Contracts.Con_Whole_Page.CON_Basic_Info.CON_START_DATE") .rawValue
endDate = xfa.resolveNode("CUSTOMER.Page31_Contracts.Con_Whole_Page.CON_Basic_Info.CON_END_DATE").r awValue
if (stDate > endDate) then
    xfa.host.messageBox("End date is lower than Start date! End date is cleared")
    xfa.resolveNode("CUSTOMER.Page31_Contracts.Con_Whole_Page.CON_Basic_Info.CON_END_DATE").r awValue = null
endif
// End date should not less than Start date, else CLEAR it - End
I tried in VALIDATE, CALCULATE, CHANGE events of END DATE, but nothing working!!
PLs. let me kow how can i achieve my requirement? I am anewbie,
Thank you

Answer 1

If you use the exit event, you will probably have to have the same code on both the start and end date fields since they have a dependancy on each other. Maybe better to try the validate event of the end date so that if either field is changed the event gets fired. You can try the following for validate event
// Pls. note this FormCalc
// End date should not less than Start date, else CLEAR it - Begin
var stDate
var endDate
stDate = CON_START_DATE.rawValue
endDate = $.rawValue
if ( HasValue(endDate) ) then
    if (stDate > endDate) then
        xfa.host.messageBox("End date is lower than Start date! End date is cleared")
        $.rawValue = null
    endif
endif
1
// End date should not less than Start date, else CLEAR it - End